Conditions: COVID-19
Keywords: COVID-19 Resistant Starch Inflammation
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 226
Healthy volunteers: no

Brief summary:
This study is a multicenter randomized trial to evaluate the efficacy of administering a dietary supplement containing resistant starch to non-hospitalized COVID-19 positive subjects, The intervention will begin as soon as possible after subjects test positive for COVID-19 and continue for 14 days. Investigators hypothesize that short-term administration of a dietary supplement containing resistant starch has the potential to reduce rates of hospitalization and improve time to clinical recovery and symptoms in non-hospitalized COVID-19 positive patients.

Detailed description:
The COVID-19 pandemic has caused a substantial strain on the healthcare system, with at least 14% of infected patients requiring hospitalization. Identifying ways to ameliorate the progression and severity of the COVID-19 infection and preventing hospitalization is critical. Patients suffering from COVID-19 have been shown to have a significant inflammatory response resembling that of cytokine release syndrome, and it is this inflammatory phase that is thought to drive fatality.

To this end, a multi-center randomized clinical trial to determine the efficacy of resistant starch in reducing the need for hospitalization for COVID-19 positive patients will be studied. This study will enroll 1500 non-hospitalized COVID-19 positive individuals who are being monitored in the outpatient setting. Patients will be randomized to either a dietary supplement containing resistant starch or a placebo for 14 days. Our primary outcome is the rate of hospitalization for COVID-19 related complications. Secondary outcomes will look at time to recovery and symptom severity scores.

Arms:
arm 1: Subjects will receive a dietary supplement containing resistant starch and be instructed to take 2 tablespoons (\~20 grams) twice daily for 14 days. Initially subjects will take 2 tablespoons once daily for the first three days prior to increasing to 2 tablespoons twice daily. arm 2: Subjects will receive a placebo starch, consisting of non resistant starch and be instructed to take 2 tablespoons (\~ 20 grams) twice daily for 14 days. Initially subjects will take 2 tablespoons once daily for the first three days.

Interventions: intervention 1: Dietary Supplement containing resistant starch intervention 2: Placebo Starch
Intervention descriptions: intervention 1: Two tablespoons (\~ 20 grams) to be taken twice daily for 14 days (start with 2 tablespoons once daily for three days, followed by twice daily on days 4 through 14) intervention 2: Two tablespoons (\~ 20 grams) to be taken twice daily for 14 days (start with 2 tablespoons once daily for three days, followed by twice daily on days 4 through 14)

Protocol document:
Prot_SAP_000.pdf: 
ClinicalTrials.gov ID: NCT04342689 
Last Approved: 6/22/2020 
Document: Protocol w SAP 


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HRP-503B – BIOMEDICAL RESEARCH PROTOCOL 
(2017-1)
Protocol Title: The Role of Resistant Potato Starch in COVID-19 Infection 
Principal Investigator: Sherry Mansour, MD, MS (PI) 
Version Date: 4-22-2020
Clinicaltrials.gov Registration #: NCT 04342689
Study Intervention: Potato-based dietary starch; Bob’s Red Mill®
Clinicaltrials.gov registration #: NCT 04342689     pre-assigned IND: 149839, FDA exempt us from IND 
regulations with an IND Discretion Enforcement in place. 
Multicenter: University of Michigan (Mary M. Riwes)
INSTRUCTIONS
This template is intended to help investigators prepare a protocol that includes all of the necessary information 
needed by the IRB to determine whether a study meets approval criteria. Read the following instructions before 
proceeding:
1.
Use this protocol template for a PI initiated study that includes direct interactions with research subjects. 
Additional templates for other types of research protocols are available in the system Library.
2.
If a section or question does not apply to your research study, type “Not Applicable” underneath.
3.
Once completed, upload your protocol in the “Basic Information” screen in IRES IRB system. 
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SECTION I: RESEARCH PLAN
Section 1. Statement of Purpose: State the scientific aim(s) of the study, or the hypotheses to be tested. 
The coronavirus disease-19 (COVID-19) pandemic has caused significant distress, and grief around the world. 
Given the rising numbers of infected individuals in the United States (US) and need for hospitalization in at least 
14% of infected patients (1), there is substantial strain on the health care system. Identifying ways to ameliorate 
the progression and severity of this infection and preventing hospitalization is critical in preventing break in 
capacity and overwhelming the healthcare system. 
Currently, it is believed that COVID-19 infected patients undergo two phases of illness; viral replication and the 
more fatal phase of inflammation. Preventing the inflammatory phase has the potential to decrease hospitalization, 
use of ventilation and mortality. Accordingly, we are proposing to identify the role of resistant potato starch (a 
natural dietary supplement) in preventing the progression to the inflammatory phase through its 
immunomodulatory effects on the gut microbiome.
To enhance generalizability, we have designed a multicenter study in varying geographical regions within the US, 
involving patients who tested positive and are not in need of hospitalization. Using a randomized phase III clinical 
trial design, we will enroll 1500 COVID-19 positive patients who are not hospitalized, to be randomized to 
receiving 2 tablespoons (~20 grams) of resistant potato starch (RPS) twice daily for 14 days vs. placebo (2 
tablespoons of non-resistant, digestible starch twice daily). We will evaluate the relationship between RPS and the 
primary outcome of hospitalization and the secondary outcomes of time to clinical recovery (TTCR) defined as 
return to normal body temperature, and alleviation of major presenting symptoms (myalgia, cough, shortness of 
breath, and GI symptoms) maintained for 72 hours and peak symptom severity score adapted from the influenza 
literature (2).
The dietary starch produced by Bob’s Red Mill® is a commercially available low-digestible carbohydrate. It is 
entirely plant based and not genetically modified. It is gluten free. Potato-based starch contains 40 calories per 12 
grams and no additional dietary nutrients, vitamins or sodium (labeling information). Corn-based starch contains 
30 calories per 8 grams and no additional nutrients, vitamins or sodium (labeling information).
Starch has been well studied within the dietary and nutritional literature and has been demonstrated safe. (3-5).
In addition, it has previously been administered to healthy human volunteers at the University of Michigan as part 
of HUM00118951 and HUM00094242– Linking the Structure and Function of the Gut Microbiome. These 
studies have revealed minimal adverse events and no serious adverse events in these subjects.
Moreover, it is being administered to allogeneic hematopoietic cell transplant (allo HCT) patients at the 
University of Michigan as part of HUM00112318 under IND 132208- Dietary manipulation of the microbiome-
metabolomic axis for mitigating graft versus host disease (GVHD) in allo HCT patients. This study has revealed 
minimal adverse events and no serious adverse events in these subjects. 
Probable Duration of Project: State the expected duration of the project, including all follow-up and data 
analysis activities. We anticipate a 12-month study duration, whereby the first six months will focus on RPS 
administration and data collection and the remaining six months on analysis and manuscript generation.
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Section 2. Background: Patients suffering from COVID-19 have been shown to have significant inflammation 
resembling cytokine release syndrome (CRS) (6). It is thought that this inflammatory phase persisting even after 
viral suppression is what leads to the more fatal phase of COVID-19.(7,8). One of the most commonly elevated 
markers in COVID-19 patients has been shown to be interleukin (IL)-6.(6,7). To this effect an IL-6 inhibitor 
known as Tocilizumab, usually used in the treatment of inflammatory 
conditions including CRS, has been used to help modulate and reduce 
this exaggerated inflammatory response in COVID-19 patients (9). 
Tocilizumab is mainly used and studied in hospitalized patients who are 
showing signs of increased inflammation, but more research on 
interventions to slow the onset of inflammation and decrease 
hospitalizations in COVID-19 patients is needed. Towards this effort, 
we propose to study the effects of RPS on the rate of hospitalizations 
in COVID-19 patients who have not yet required hospitalization. 
Decreasing hospitalization rates is vital in preventing the current 
burden on our healthcare system and will minimize exposure of 
healthcare workers to this highly infectious disease. The rationale for 
using RPS to mitigate COVID-19 hospitalizations is based on the ability 
of resistant starch to decrease IL-6 in humans (Figure 1).(10,11). 
Furthermore, others, as well as our group. have shown that resistant 
starch increases butyrate levels (12-14), which in turn has been shown to 
reduce IL-6 production and overall inflammation (15). Additionally 
butyrate has also been shown to specifically decrease lung inflammation 
in animal models by suppressing inflammatory cytokine production 
(Figure 2) (16-20). As butyrate is produced in higher amounts in the 
gastrointestinal tract, it can be absorbed into the bloodstream and has 
been shown to have significant amelioration of lower respiratory infections and inflammation in humans (21). It 
has also been postulated that butyrate decreases Angiotensin 
Converting Enzyme 2 (ACE2) receptor expression, which is the 
main entry mechanism for COVID-19 into epithelial lung cells 
(16-19). Our preliminary data shows that within one week of being 
on RPS therapy (~20 grams twice daily), participants’ stool 
butyrate levels increases (14). As RPS is a commonly used 
nutritional supplement, often used in gluten free cooking and 
baking, it offers minimal risk to participants in this proposed work. 
Furthermore, we have encountered only minimal adverse events 
and no serious adverse events from its use in our preliminary data 
in allo HCT patients (HUM00112318 under IND 132208) (14). 
Hence, we propose to enroll 1500 COVID-19 positive patients, 
who are being monitored in the outpatient setting, to receive 2 
tablespoons (~ 20 grams) of RPS twice daily for 14 days vs. 
placebo to test our hypothesis that RPS will reduce rate of 
hospitalization in COVID-19 patients. Our primary outcome of 
interest will be rate of hospitalization for COVID-19 related 
complications and our secondary outcomes will be TTCR and symptom 
severity score (2). If our hypothesis is proven, this simple, minimal risk intervention, will have the potential to 
reduce healthcare burden and improve patient outcomes.
Figure 1. Schematic of the effect of 
RPS on lowering IL-6
Figure 2. Schematic of the effect of  
RPS on lung inflammation
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Section 3. Preliminary Data 
•RPS is potent at increasing butyrate levels in stool of 
healthy humans, compared to other forms of dietary 
resistant starch. Published data showed that administration of 
defined quantities of RPS induces production of butyrate from 
the microbiota in 20 healthy volunteers (12) (Figure 3). 
•RPS alters stool butyrate levels in allo HCT patients. Our 
published preliminary data showed that administration of RPS 
in a pilot study increased stool butyrate levels in allo HCT 
recipients (14) (Figure 4). 
•Butyrate inhibits IL-6. Human endothelial cells  pretreated 
with butyrate and then stimulated with lipopolysaccharide 
(LPS) and tumor necrosis factor-alpha (TNF-α) had significant 
reductions in IL-6 compared to endothelial cells without 
butyrate pretreatmet (15) (Figure 5). 
Figure 3. Fecal butyrate levels before (blue) and 
after 
(red) 
RPS 
(“Potato”) 
or 
other 
commercially available dietary resistant starch 
preparations
Figure 4. Effect of RPS on allo HCT 
recipients’ stool butyrate levels. 
Figure 5. Effects of butyrate on IL-6 release. (A–F) The effects of 
butyrate on IL-6 release with 24 h pre-incubation and 6, 12, or 24 h 
stimulation. (A–C) Butyrate combined with LPS. (D–E) Butyrate 
combined with TNFα. N = 4, ∗∗p < 0.01, ∗∗∗p < 0.001 compared with 
control group. #p < 0.05, ##p < 0.01, ###p < 0.001 compared with 
LPS or TNFα group.
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•Butyrate is associated with less viral lower respiratory tract infections. Increased abundance of butyrate 
producers in the intestinal microbiome (which is correlated with higher stool butyrate levels) was associated with 
less viral lower respiratory tract infections in allo HCT recipients (21) (Figure 6)
. 
Section 4. Research Plan: 
Study Design. 
This is a multicenter phase III randomized, placebo 
controlled, double blinded, clinical trial enrolling 1500 
COVID-19 positive patients who are being 
managed as outpatients to investigate the role of 
RPS in incident hospitalization after COVID-19 
diagnosis as well as the secondary outcomes of 
TTCR and symptom severity score. Participants 
will be enrolled from multiple sites. Patients will be 
identified via Electronic Health Record (EHR) 
using a real time compiled list of COVID-19 
positive patients at University of Michigan, and will 
similarly be identified via an EHR compiled list at 
other sites. Initial screening will be conducted via 
review of the EHR and will be followed up by a 
telephone call to obtain informed consent and to 
confirm inclusion and exclusion criteria (Table 1). 
If subjects agree to participate in the study via 
phone and meet the inclusion criteria, an informed 
consent document will be sent to patients 
electronically for subjects to sign digitally via 
SignNow. Upon receipt of subject’s informed 
consent documentation with approval to participate 
in our study, pre-packaged Bob’s Red Mill® RPS vs. pre-packaged placebo consisting of iso-caloric digestible 
Bob’s Red Mill® corn starch (non-resistant starch) will be delivered to their home, with printed instructions (see 
Figure 7. Trial Design
Figure 6. Increased butyrate producers are associated with reduction in 
viral lower respiratory tract infections
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attached instructions) on how to take the RPS or placebo for the duration of the trial. Patients will be asked to 
take 2 tablespoons (~20 grams) of RPS in water or juice or applesauce (any cool substance to make it palatable) 
twice daily for 14 days with the same instructions for the placebo arm. Patients will be called every 2 days while 
taking RPS to assess symptoms and adverse events via a pre-specified questionnaire (see attached 
questionnaire) for the first 14 days and then will be called weekly until 30 days after the last dose of treatment.  
Patients are then followed via EHR to complete the 4-months follow up from the time of diagnosis (ie. COVID 
test positive) (Figure 7). Of note, the placebo will be identical in appearance and packaging as the RPS. Both 
food ingredients, placebo and RPS, are isocaloric (approximately 140 calories per day from either food 
ingredient). The placebo has been safely used as a control in human clinical trials (NCT 02763033, 
NCT01939600, NCT01708694).
Inclusion and Exclusion Criteria:
Table 1. Inclusion and Exclusion criteria: 
Inclusion criteria
Participants >18 years of age with COVID-19 positive status who 
are monitored in the outpatient setting and are English speaking.
Exclusion criteria
Inflammatory bowel disease, history of gastric bypass surgery, 
active Clostridium difficile infection, active participation in 
another COVID-19 intervention trial, any physical or 
psychological condition that, in the opinion of the investigator, 
would pose unacceptable risk to the patient or raise concern that 
the patient would not comply with protocol procedures. We will 
also exclude reported allergy to potato starch or corn starch or 
difficulty swallowing in order to prevent any aspiration risk or 
anyone on IL-6 inhibitors (such as Tocilizumab)
Primary Objectives
-To assess the effect of RPS on hospitalization rates in COVID-19 infection
Primary Outcome Measure:
Hospitalization for a COVID-19 related admission during the first month of follow up. 
A COVID-19 related admission is defined as the following:
•Presenting symptoms of fever or shortness of breath or myalgia or cough or hypoxia.
•Admission diagnosis of hypoxic respiratory failure, pneumonia, vial pneumonia. 
•Death prior to hospitalization thought to be secondary to COVID-19 will also be defined as an event.
All hospital admissions will be reviewed and adjudicated by site PI to ensure that the hospitalization is a COVID-
19 related admission.
Secondary Objectives 
-To access the effect of RPS on time to clinical recovery (TTCR)
Secondary Outcome Measure: 
TTCR will be defined as a return to normal body temperature to 97°F -99°F as reported by the patient, and 
resolution of any major presenting symptoms (myalgia, cough, shortness of breath, GI symptoms) maintained for 
72 hours.
-To assess the effect of RPS on symptom severity score
Secondary Outcome Measure:
Symptom severity score (2): This will be evaluated using a subjective self-reporting questionnaire (see section 15: 
Appendices) around eight symptoms, which include:
1) Shortness of breath at rest or on exertion
2) Fatigue
3) Myalgia/ muscle aches
4) Feverishness
5) Cough
6) Headaches
7) GI symptoms
8) Inability to taste or smell
Participants will rate each of their symptoms on an ordinal scale as follows: 
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 absent (0), mild (1), moderate (2), or severe (3). These symptom ratings will be added to define the symptom 
severity score with a possible score range of 0–24 points.
Inquiry regarding symptom severity score will take place during phone questionnaires with patients performed Q2 
days for 14 days from start of treatment then weekly until 30 days from last dose of treatment.
Exploratory Objectives
To understand whether RPS has an effect on Emergency Room (ER) visits without admission. 
Among those who end up hospitalized, we will explore whether RPS has an effect on: 
1. Oxygen requirement
2. Need for mechanical ventilation
3. Duration of ventilation
4. Length of hospital stay
5. Levels of inflammatory markers routinely ordered as part of clinical care (CRP, LDH, D-dimer, Ferritin, Il-6)
6. Rates of discharge
SUBJECT ELIGIBILITY
Subjects must meet all of the selection criteria to be enrolled to the study. Study treatment may not begin until a 
subject has been consented and meets the eligibility criteria.
Inclusion Criteria (please also refer to Table 1)
Participants >18 years of age with who are:
1.
COVID-19 test positive status
2.
Monitored in the outpatient setting
Exclusion Criteria
1.
Inflammatory bowel disease
2.
History of gastric bypass
3.
Active Clostridium difficile infection
4.
Active participation in another COVID-19 intervention trial 
5.
Any physical or psychological condition that, in the opinion of the investigator, would 
pose unacceptable risk to the patient or raise concern that the patient would not comply 
with protocol procedures
6.
Reported allergy to potato-based starch or corn-based starch
7.
Difficulty swallowing in order to prevent any aspiration risk
8.
Currently taking any IL-6 inhibitors such as Tocilizumab for any disease condition
SUBJECT SCREENING, ENROLMENT, AND RECRUITMENT
This study will be conducted at multiple sites. Patients >18 years of age with COVID-19 positive status and who 
are being monitored in the outpatient setting will be approached by phone. IRB-approved informed consent must 
be obtained from patients prior to the initiation of treatment on this protocol. After informed consent is obtained 
and prior to the initiation of protocol therapy, all patients satisfying the inclusion/exclusion criteria must have 
eligibility confirmed by the PI or Co-I of the study team at each site. The patient will not be considered enrolled 
in the study until all information is confirmed by the PI or Co-I.
Screen Failures
Participants who are consented to participate in the clinical trial, who do not meet one or more criteria required for 
participation in the trial during the screening procedures, are considered screen failures.  Screen failures will not 
be re-screened. 
Randomization 
We will use stratified (by site) permuted block randomization and will generate randomization lists to be sent to 
the investigational pharmacy for packaging of starch and delivery to the designated participants. 
Blinding
The study will be double blinded to patients and investigators. The study team will include investigational 
pharmacists who will package the intervention RPS and placebo starch into packages labeled per FDA guidelines, 
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and will not share the labeling key code with any of the other study members who are performing the study. 
Labeling will also comply with labeling regulations under 21 CFR 312.6. As aforementioned in section 4.2 above, 
we will use stratified (by site) permuted block randomization and will generate randomization lists to be sent to 
the research staff members who will package the starch to deliver the designated packages to participants
.
Subject Recruitment and Retention
Subjects will be identified via the use of an EHR compiled list of COVID-19 positive patients who are 
outpatients. We will use medical records to obtain phone numbers. We will contact patients via phone and before 
discussing any material pertaining to the study, we will first inform the patients that this call is regarding a 
research study and if they would like they can opt out, to ensure that the option of opting out is given to the 
patient as early as possible. If the patient agrees to hear information regarding the study, we will provide an oral 
presentation of the study. Additionally, we will also post flyers at testing centers to give participants information 
about the study and the option to opt out. After presenting the study to patients by phone, an informed consent 
document will be sent to the patient electronically for subjects to sign digitally. After informed consent is 
obtained, screening to ensure that participants meet the inclusion/ exclusion criteria will be performed via phone 
and EHR. All follow up will be via phone calls and EHR review. The above plan was put together in order to 
limit contact with COVID-19 positive patients as the alternative of approaching and following the patients in 
person will put the research staff and the community at large at risk as it will promote the spread of this highly 
infectious virus by bringing these patients to the health system.
Drug Information
• This study investigates a food source that is being used as a drug but FDA offered a Discretionary Exemption to 
the IND application. While there are many potential sources for a potato-based or corn-based starch, we have 
chosen to use starch produced by Bob’s Red Mill® because it is easily commercially available, economical and 
previously well tolerated in our preliminary data
•Some possible side effects to starch are flatulence (gas), abdominal bloating and chalky taste in the mouth. 
However, the majority of patients do not experience any symptoms when ingesting the dietary supplement. Below 
are the symptoms that may be experienced from the starch listed as possible, infrequent, and rare:
Possible 10-25 %: flatulence (gas), bloating, chalky taste in your mouth after drinking the starch, which resolves 
quickly
Infrequent 5-10 %: abdominal cramps, diarrhea, nausea, vomiting
Rare <5%: allergy to starch  
Although very minimal adverse events and no serious adverse events were observed in our preliminary data, we 
have compiled a list of possible adverse events that will need to be reported to the safety monitoring coordinators.
•  Contraindications
No contraindications to administration of this investigational agent other than the exclusion criteria noted. 
Specifically, should an enrolled subject develop one of the exclusion criteria (ie active Clostridium difficile 
infection or IBD) after enrollment and initiation of the study, they will be allowed to continue on study treatment. 
Meeting the primary end point of hospitalization is considered a contraindication to continue with the 
investigational agent.
The only concomitant medications prohibited on the study are anti-IL 6 inhibitors such as Tociluzimab, which is 
one of the exclusion criteria. This is usually a medication started as inpatient so we don’t anticipate our patient 
population will be prescribed this drug after enrollment and while on investigational agent, since subjects will 
only continue to receive the investigational agent if they are not hospitalized.  
• Interaction with other medications
As a dietary supplement and component of normal dietary intake, there are no anticipated interactions with other 
medications.
• Storage and stability: Store at room temperature, 59 °F to 86 °F.  Avoid extremes of temperature. No need for 
refrigeration
• Preparation and Dispensing: Mix 2 tablespoons of dietary starch (~20 grams) with any amount water, juice, 
applesauce or any other cool substance to make palatable. Starch substance should not be heated or warmed
• Other administration instructions: No regulation for administration of starch with or without other food or 
medications. As this is a commercially available food product, subjects can keep any remaining product at the end 
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of study. We will determine compliance via questionnaire that will be utilized during phone follow ups. Doses 
should be administered twice daily. Although we suggest the doses be spread apart to minimize any potential GI 
disturbance, there is no limit as to how closely together doses can be given. For example, doses do NOT need to 
be given 12 hours apart and instead can be given at times that feel comfortable to the subject
• Missed doses should be documented by the research team during phone follow up 
• Missed doses should simply be skipped with no need to make up this dose at a later time
• Availability: Commercially Available. Potato starch and corn starch packages will be provided for the study free 
of change by Bob’s Red Mill. Please see product specifications (attached)
.All starch for this study has been freely donated by Bob’s Red Mill with no expectations or contracts. The starch 
has already been shipped to both sites. 
• Nutritional label: 
Packaging and Delivery of potato starch (active) and corn starch (placebo) (600 grams and 500 grams 
respectively): 
As this is a double blinded randomized control trial, investigators and participants will not be made aware of 
participant allocation to intervention or placebo starch.
To ensure blinded study design, as well as safe packaging and shipment of starch the following steps will take 
place: 
-Starch was delivered from Bob’s Red Mill free of change to: 
Yale Investigational Pharmacy (55 Park Street, New Haven, Ct)
- Similarly, starch was delivered from Bob’s Red Mill free of charge to Michigan site.
- Only the pharmacist will hold the labeling key and will repackage the starch. The manufacturer packaging will 
be removed and the starch will be emptied into a pre-labeled freezer ziploc bag. To ensure secure packaging of 
starch, each amount (either 600 or 500 grams depending on type of starch) will be double bagged for safety. 
Labeling will comply with labeling regulations.
- Starch packages will be repackaged and labeled at Yale’s investigational drug services (IDS) who will be 
responsible for dispensing the starch, keeping drug accountability logs and compliance with any relevant state 
requirements. Research study team will package the starch at University of Michigan and the IDS at Michigan 
will dispense and ship the starch accordingly.
-A generated list of enrolled participants randomized to intervention or placebo by stratified permuted block 
randomization will be given to IDS who will ship starch based on patient allocation.
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Treatment Dosage and Administration
RPS or placebo will be administered at ~20 grams (2 tablespoons) once daily for days 1-3 and then twice daily for 
days 4-14, (Table 2). 
Intervention and Placebo: 
Table 2. Intervention and Placebo
Study Product, 
Dose, Route 
Regimen 
Food Source (used as a drug): Potato based dietary starch, Bob’s 
Red Mill®, ~20 grams (2 tablespoons) orally twice daily. 
(start with 2 tablespoons once daily for 3 days, followed by 
twice daily on days 4 to 14 to minimize GI symptoms)
Intervention
Duration of 
Administration
14 days
Study Product, 
Dose, Route 
Regimen 
Food Source (used as a drug): Corn based dietary starch by 
Bob’s Red Mill,  ~20 grams (2 tablespoons) orally twice daily. 
(start with 2 tablespoons once daily for 3 days, followed by 
twice daily on days 4 to 14)
Placebo
Duration of 
Administration
14 days
• Storage and stability: Avoid extremes of temperature. No need for refrigeration. 
• Preparation and Dispensing: Mix 2 tablespoons of dietary starch (~20 grams) with any amount water, juice, 
applesauce or any other cool substance to make palatable. Starch substance should not be heated or warmed. 
• Other administration instructions: No regulation for administration of starch with or without other food or 
medications. As this is a commercially available food product, subjects can keep any remaining product at the end 
of study. We will determine compliance via questionnaire that will be utilized during phone follow ups (see 
attached questionnaire). Doses should be administered twice daily. Although we suggest the doses be spread 
apart to minimize any potential GI disturbance, there is no limit as to how closely together doses can be given. 
For example, doses do NOT need to be given 12 hours apart and instead can be given at times that feel 
comfortable to the subject. 
• Missed doses should be documented by the research team during phone follow up 
• Missed doses should simply be skipped with no need to make up this dose at a later time. 
• Availability: Commercially Available
Toxicities and Dosing Delays/Dose Modifications
• This study investigates a food source used as a drug but has been given Discretion Exemption from the FDA. 
While there are many potential sources for a potato-based or corn-based starch, we have chosen to use starch 
produced by Bob’s Red Mill® because it is easily commercially available, economical and previously well 
tolerated in our preliminary data.
• Starches are regulated by the Food and Drug Administration (FDA). The FDA’s Select Committee on GRAS 
(Generally Recognized as Safe) Substances published an opinion in 1979 that stated: “There is no evidence in the 
available information on unmodified or pregelatinized corn, high amylose corn, waxy maize, wheat, milo (also 
called grain sorghum starch), rice, potato, tapioca or arrowroot starch that demonstrates or suggests reasonable 
grounds to suspect a hazard to the public when they are used at levels that are now current or that might 
reasonably be expected in the future” (SCOGS 1979).
• Drug Interactions: None known
• As starch is a natural nutritional supplement used for gluten free baking and cooking, we anticipate none to 
minimal risk to participants. Some possible side effects to starch are flatulence (gas), abdominal bloating and 
chalky taste in the mouth. However, the majority of patients do not experience any symptoms when ingesting the 
dietary supplement. Below are the symptoms that may be experienced from the starch listed as possible, 
infrequent, and rare:
Possible 10-25 %: flatulence (gas), bloating, chalky taste in your mouth after drinking the starch, which resolves 
quickly
Infrequent 5-10 %: abdominal cramps, diarrhea, nausea, vomiting
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Rare <5%: allergy to starch  
Although very minimal adverse events and no serious adverse events were observed in our preliminary data, we 
have compiled a list of possible adverse events that will need to be reported to the safety monitoring coordinators 
(Table 3).
• Drug Interactions: None known
Table 3. Possible adverse events secondary to dietary starch use that will need to be reported to safety monitor 
Adverse events related to 
Resistant Potato Starch (RPS)

Allergy to potato or corn 
based starch

Persistent* Abdominal 
cramping or pain

Nausea or vomiting

Diarrhea 

Persistent Bloating

Persistent Flatulence
All will be reported within 1 to 5 
days to safety monitoring 
coordinator of event becoming 
known to PI at each site.
*Persistent symptoms will be defined as lasting 72 hours or longer
• If persistent side effects related to the investigational agent occur, a dose reduction can be made to once daily 
instead of twice daily dosing at the discretion of the PI or Co-I. If intolerability continues, despite decreasing the 
frequency of dosing, the investigational agent may be held for up to 3 days. Investigational agent can also be held 
for up to 3 days if the patient is unable to take oral intake for any reason. If investigational agent is held longer 
than 3 days, subject will be removed from treatment and included with an intention to treat protocol. 
• The study intervention will be discontinued if patient meets the primary study endpoint of hospitalization
The Placebo uses corn starch. A potential risk although rare is allergy to corn.  We will in screening ask about the 
potential subjects’ exposure to corn and any reaction or avoidance of corn.  Allergies to corn are extremely rare 
and there are no recent literature documenting specific rates, but one study from 1950 showed a very low rate of 
0.16% (DOI:https://doi.org/10.1016/0021-8707(50)90098-0). 
Concomitant Medications/Treatments
The only concomitant medications prohibited on the study are anti-IL 6 inhibitors such as Tociluzimab which is 
one of the exclusion criteria. Tociluzimab is usually started as an inpatient so we don’t anticipate our patient 
population will be prescribed this medication while on study, since subjects will only continue to receive the 
investigational agent (starch) if they are not hospitalized.  
Other Modalities or Procedures:
Only English-speaking patients will be mailed an instruction sheet with their investigational agent.
Duration of Therapy
Treatment will continue for 14 days, or until one of the following criteria apply: 

Hospitalization

Death

Persistent adverse event(s) leading to the investigational agent to be held for longer than 
3 days

Subject voluntarily withdraws from treatment OR

General or specific changes in the subject’s condition render the subject unacceptable for 
further treatment in the judgment of the investigator
Off Treatment Criteria 
Patients will be removed from protocol therapy when any of the criteria listed above. The reason for ending 
protocol therapy and the date the patient was removed from treatment will be documented. All patients who 
discontinue treatment should comply with protocol specific follow-up procedures. The only exception to this 
requirement is when a subject withdraws consent for all study procedures or loses the ability to consent freely.
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Duration of Follow-Up
Subjects will be followed for 4 months from positive COVID-19 test or until death, whichever occurs first. 
Subjects will be followed for adverse events for at least 30 days after the last dose of study drug. Subjects 
removed from treatment for persistent adverse events thought to be due to interventional treatment will be 
followed until resolution or stabilization of the adverse event 
Off Study Criteria
Patients can be taken off study at any time at their own request, or they may be withdrawn at the discretion of the 
investigator for safety, behavioral or administrative reasons. The reason(s) for discontinuation from study will be 
documented and may include: 
•Patient withdraws consent (termination of treatment and follow-up); 
•Loss of ability to freely provide consent through imprisonment or involuntary incarceration for treatment; 
•Patient is unable to comply with protocol requirements; 
•Investigators judge continuation on the study would not be in the patients best interest; 
•Lost to Follow-up. If a research subject cannot be located to document hospitalization, the subject may be 
considered “lost to follow-up.” All attempts to contact the subject during the four-month period must be 
documented.
•Termination of the study by any of the participating IRBs or FDA. 
•Patient completes protocol treatment and follow-up criteria.
Subject Replacement
If subject needs to go off study after randomization, protocol dictates that subject cannot be replaced given the 
intention to treat nature of the protocol.
Screening baseline procedures 
Assessments performed exclusively to determine eligibility for this study will be done only after obtaining 
informed consent. Assessments performed for clinical indications (not exclusively to determine study eligibility) 
such as COVID testing may be used for baseline values even if the studies were done before informed consent 
was obtained.
All screening procedures must be performed within 7 days prior to registration unless otherwise stated. The 
screening procedures include:
1 Informed Consent
2 Medical history: Complete medical and surgical history
3 Demographics: Age, gender, race, ethnicity
4 Review subject eligibility criteria
5 Review previous and concomitant medications
6 Adverse event assessment
Procedures during treatment and follow up procedures 
Assessment for primary objective of hospitalization at one month via phone and EHR:
Every 2 days phone questionnaires (see attached questionnaire) and EHR review for the first 14 days followed 
by once weekly phone call and EHR review to complete a month follow up from last dose of treatment. 
Assessment for secondary objectives of TTCR and symptom severity score via phone and EHR: 
Every 2 day phone questionnaires (see attached questionnaire) and EHR review for the first 14 days followed by 
once weekly phone call and EHR review to complete a month follow up from last dose of treatment. 
Assessment of exploratory objectives
EHR review to complete 4 months follow up from COVID positive test
Safety and Tolerability 
Analyses will be performed for all subjects having received at least one dose of study drug. 
Assessment of adverse events (outlined in Table 3 above) 
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Every 2-day phone questionnaires (Table 4) and EHR review for the first 14 days followed by once weekly to 
complete a month follow up from last dose of treatment. Subjects will be followed for adverse events for at least 
30 days after the last dose of study treatment. Subjects removed from treatment for persistent adverse events 
thought to be due to interventional treatment will be followed until resolution or stabilization of the adverse event. 
  
Table 4: Time and Events
Section 5. Subject Population: Provide a detailed description of the types of human subjects who will be 
recruited into this study.
Participants >18 years of age with COVID-19 positive status and who are English speaking and do not require 
hospitalization. Upon enrollment participants cannot be hospitalized and cannot be actively enrolled in any 
other interventional trials. Participants with any allergy to potato or corn starch or inability or difficulty 
swallowing solids/liquids will also be excluded.  For full inclusion and exclusion criteria, please refer to 
Table 1 above. 
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Section 6. Subject classification: Check off all classifications of subjects that will be specifically recruited for 
enrollment in the research project. Will subjects who may require additional safeguards or other considerations be 
enrolled in the study? If so, identify the population of subjects requiring special safeguards and provide a 
justification for their involvement. N/A
NOTE: Is this research proposal designed to enroll children who are wards of the state as potential subjects?
Yes ☐  No ☒ 
Section 7. Inclusion/Exclusion Criteria: What are the criteria used to determine subject inclusion or exclusion?
Assessments performed exclusively to determine eligibility for this study will be done only after obtaining 
informed consent. Assessments performed for clinical indications (not exclusively to determine study 
eligibility) such as COVID testing may be used for baseline values even if the studies were done before 
informed consent was obtained.
All screening procedures must be performed within 7 days prior to registration unless otherwise stated. The 
screening procedures include:
1 Informed Consent
2 Medical history: Complete medical and surgical history
3 Demographics: Age, gender, race, ethnicity
4 Review subject eligibility criteria
5 Review previous and concomitant medications
6 Adverse event assessment
Section 8. How will eligibility be determined, and by whom? 
This study will be conducted at multiple sites. Patients >18 years of age with COVID-19 positive status and 
who are being monitored in the outpatient setting will be approached by phone. IRB-approved informed 
consent must be obtained from patients prior to the initiation of treatment on this protocol. After informed 
consent is obtained and prior to the initiation of protocol therapy, all patients satisfying the 
inclusion/exclusion criteria must have eligibility confirmed by the PI or Co-I of the study team at each site. 
The patient will not be considered enrolled in the study until all information is confirmed by the PI or Co-I. 
Both the EHR and phone calls on enrollment will be used to assess eligibility criteria.
Section 9. Risks: Describe the reasonably foreseeable risks, including risks to subject privacy, discomforts, or 
inconveniences associated with subjects participating in the research. 
There is minimal risk to our intervention as RPS is a natural nutritional source often used for gluten free 
baking and cooking. Similarly, corn starch should offer minimal risk as a placebo to study participants. There 
is some inconvenience to participants, as we will monitor their progress via phone calls every two days to 
assess their symptoms via a phone questionnaire. 
While there are many potential sources for a potato-based or corn-based starch, we have chosen to use starch 
produced by Bob’s Red Mill® because it is easily commercially available, economical and previously well 
tolerated in our preliminary data.
Adverse Reactions
Only mild adverse reactions and no serious adverse reactions have been noted with the previous 
administration of this dietary supplement to a group of healthy volunteers (HUM00118951 and 
HUM00094242 from the University of Michigan) or to allo HCT patients (HUM00112318 from the 
University of Michigan). Some possible side effects to starch are flatulence (gas), abdominal bloating and 
chalky taste in the mouth. However, the majority of patients do not experience any symptoms when ingesting 
the dietary supplement. Below are the symptoms that may be experienced from the starch listed as possible, 
infrequent, and rare:
Possible 10-25 %: flatulence (gas), bloating, chalky taste in your mouth after drinking the starch, which 
resolves quickly
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Infrequent 5-10 %: abdominal cramps, diarrhea, nausea, vomiting
Rare <5%: allergy to starch  
Although no serious side effects were observed in our preliminary data, we have compiled a list of possible 
adverse events that will need to be reported to the safety monitoring coordinators (Table 3 above).
Section 10. Minimizing Risks: Describe the manner in which the above-mentioned risks will be minimized.
To minimize risk of GI discomfort, the participants will work up to the full dose of starch during the initial 3 days 
of study.
Section 11. Data and Safety Monitoring Plan: Include an appropriate Data and Safety Monitoring Plan (DSMP) 
based on the investigator’s risk assessment stated below. (Note: the HIC will make the final determination of the 
risk to subjects.)
a. 
What is the investigator’s assessment of the overall risk level for subjects participating in this 
study? Minimal risk
b.
If children are involved, what is the investigator’s assessment of the overall risk level for the 
children participating in this study? Minimal risk
c.
Include an appropriate Data and Safety Monitoring Plan. Examples of DSMPs are  
available here http://your.yale.edu/policies-procedures/forms/420-fr-01-data-and-safety-
monitoring-plans-templates 
Adverse event (AE) monitoring and reporting is a routine part of every clinical trial and is done to ensure the 
safety of subjects enrolled in the studies as well as those who will enroll in future studies using similar agents. 
Data on adverse events will be collected from the time of the initial study treatment through 30 days after the last 
dose.  Any serious adverse event that occurs more than 30 days after the last study treatment and is considered 
related to the study treatment must also be reported. Serious Adverse Events (SAEs) will continue to be followed 
until:

Resolution or the symptoms or signs that constitute the serious adverse event return to 
baseline;

There is satisfactory explanation other than the study [treatment or intervention] for the 
changes observed; or 

Death.
The investigator is responsible for the detection, documentation, grading and assignment of attribution of events 
meeting the criteria and definition of an AE or SAE. The definitions of AEs and SAEs are given below. It is the 
responsibility of the principal investigator to ensure that all staff involved in the trial is familiar with the content 
of this section.
Any medical condition or laboratory abnormality with an onset date before initial study treatment is considered to 
be pre-existing in nature. Any known pre-existing conditions that are ongoing at time of study entry should be 
considered medical history.
All events meeting the criteria and definition of an AE or SAE, as defined below, occurring from the initial study 
treatment through 30 days following the last dose of study treatment must be recorded as an adverse event in the 
subject’s source documents and on the CRF regardless of frequency, severity (grade) or assessed relationship to 
the study treatment. 
In addition to new events, any increase in the frequency or severity (i.e., toxicity grade) of a pre-existing condition 
that occurs after the subject begins study treatment is also considered an adverse event.
Review of AE and SAE data will be performed on a routine basis by the Data and Safety Monitoring Board 
(DSMB).
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Definitions
1.
Adverse Event
Adverse Event Definition
An adverse event (AE) is any untoward medical occurrence in a subject participating in an investigational study 
or protocol regardless of causality assessment.  An adverse event can be an unfavorable and unintended sign, 
symptom, syndrome or disease associated with or occurring during the use of an investigational product whether 
or not considered related to the investigational product.
2.
Serious Adverse Event
An adverse event is considered “serious” if, in the view of the investigator, it results in any of the following 
outcomes:
 
o
Death
If death results from (progression of) the disease, the disease should be reported as event (SAE) itself.
o
A life-threatening adverse event
An adverse even is considered ‘life-threatening’ if, in the view of either the investigator [or sponsor], 
its occurrence places the subject at immediate risk of death. It does not include an adverse event that, 
had it occurred in a more severe form, might have caused death. 
o
Inpatient hospitalization or prolongation of existing hospitalization for > 24 hours.
o
A persistent or significant incapacity or substantial disruption of the ability to conduct normal life 
functions
o
A congenital anomaly/birth defect
o
Important medical event
Any event that may not result in death, be life-threatening, or require hospitalization may be considered serious 
when, based upon appropriate medical judgment, it may jeopardize the subject and may require medical or 
surgical intervention to prevent one of the outcomes listed in this definition of “Serious Adverse Event”. 
Examples of such medical events include allergic bronchospasm requiring intensive treatment in an emergency 
room or at home; convulsions that do not result in inpatient hospitalization or the development of drug 
dependency or drug abuse.
Previously planned (prior to the informed consent) surgeries should not be reported as SAEs unless the underlying 
medical condition has worsened during the course of the study. Preplanned hospitalizations or procedures for 
preexisting conditions that are already recorded in the subject’s medical history at the time of study enrollment 
should not be considered SAEs. Hospitalization or prolongation of hospitalization without a precipitating clinical 
AE (for example, for the administration of study therapy or other protocol-required procedure) should not be 
considered SAEs. However, if the preexisting condition worsened during the course of the study, it should be 
reported as an SAE.
3.
Expected Adverse Events
An adverse event (AE) is considered “expected” if:

For approved and marketed drugs or devices, those adverse events are described in the approved Package 
Insert (Label). 

In clinical research studies, information on expected adverse events is also summarized in the protocol and in 
the consent document. 
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4.
Unexpected Adverse Event
An adverse event (AE) is considered “unexpected” if it is not described in the Package Insert, in published 
medical literature, in the protocol, or in the informed consent document. 
Adverse Event Characteristics
1.
Terms and Grading
The severity or grade of an adverse event may be measured using the following definitions:
Mild:  Noticeable to the subject, but does not interfere with subject’s expected daily activities, usually does not 
require additional therapy or intervention, dose reduction, or discontinuation of the study.
Moderate:  Interferes with the subject’s expected daily activities, may require some additional therapy or 
intervention but does not require discontinuation of the study.
Severe: Extremely limits the subject’s daily activities and may require discontinuation of study therapy, and/or 
additional treatment or intervention to resolve.
2.
Attribution of the AE
The investigator or co-investigator is responsible for assignment of attribution.

Definite – The AE is clearly related to the study treatment/intervention.

Probable – The AE is likely related to the study treatment/intervention.

Possible – The AE may be related to the study treatment/intervention.

Unlikely – The AE is doubtfully related to the study treatment/intervention.
Unrelated – The AE is clearly NOT related to the study treatment/intervention.
Reporting of AEs and SAEs for this study
In the event of an adverse event, the first concern will be for the safety of the subject. Investigators are required to 
report any SAE, whether expected or unexpected, and which is felt by the investigator to be reasonably or 
possibly related to or caused by the study treatment. All events meeting these criteria will be reported for the time 
period beginning with any amount of exposure to study treatment until 30 days from the last dose of treatment. 
We will report expected or unexpected SAEs to the IRB that are deemed related to the investigational agent 
according to the reporting requirements of the IRB. Adverse events will be reported according to the IRB 
reporting guidelines.  
Reporting of Unanticipated Problems
Unanticipated problem: Per FDA Procedural Guidance for Clinical Investigators, Sponsors, and IRBs (January 
2009), A serious problem that has implications for the conduct of the study (requiring a significant and usually 
safety-related, change in the protocol such as revising inclusion/exclusion criteria or including a new monitoring 
requirement, or informed consent).
Upon becoming aware of any incident, experience, or outcome (not related to an adverse event) that may 
represent an unanticipated problem, the investigator should assess whether the incident, experience, or outcome 
represents an unanticipated problem. The incident, experience, or outcomes is considered unanticipated if it meets 
all of the following criteria:
1.
Unexpected (in terms of nature, severity, or frequency);
2.
Related or possibly related to participation in the research; and
3.
Suggests that the research places subjects or others at a greater risk of harm than was 
previously known or recognized.
Unanticipated problem Reporting: Per 21 CFR 312.66, 312.53 (c)(1)(vii), and 56.108(b)(1), should an 
Unanticipated problem occur during the investigation, the investigator will promptly report all unanticipated 
problems involving risks to human subjects or others to the IRB /FDA.
Reporting of Pregnancy
N/A
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Stopping Rules 
During the interim statistical analysis, we will analyze the efficacy of RPS in relation to the primary outcome of 
hospitalization. If there is a significant difference between the two arms with p-value of <0.01, we will not 
continue the study.
Data and Safety Monitoring 
Briefly, the principal investigator from each site will be responsible for monitoring the data, assuring protocol 
compliance, and conducting the safety reviews every week throughout the duration of the study. During the 
review process the principal investigators will evaluate whether the study should continue unchanged, require 
modification/amendment, or close to enrollment.
The principal investigators, or the Institutional Review Board (IRB) have the authority to stop or suspend    the 
study or require modifications.
This protocol presents minimal risks to the subjects and adverse events are not anticipated. In the unlikely event 
that such events occur, reportable events (expected or unexpected SAEs that are deemed related to the 
investigational agent and Unanticipated Problems Involving Risks to Subjects or Others (UPIRSOs)) will be 
reported by the research coordinator to the PI as soon as they occur , followed by a written report within 7 
calendar days of the Principal Investigator becoming aware of the event to the IRB and any appropriate funding 
and regulatory agencies. The investigator will apprise fellow investigators and study personnel of all reportable 
SAEs and UPIRSOs that occur during the conduct of this research project through regular study meetings via 
video-conferences, and emails. The protocol’s central safety research monitor will be informed of any reportable 
SAEs or UPIRSOs within 48 hours of the event becoming known to the principal investigators. 
Data Safety Monitoring Committee (DSMC)
The study specific DSMC consisting of Mike Simonov (Physician and Statistician), Mary Savoye (Registered 
Dietician), and Yasemin Kavak (Research Coordinator) will meet monthly or more frequently depending on the 
activity of the protocol. The discussion will include matters related to the safety of study participants (reportable 
SAEs and UPIRSOs), validity and integrity of the data, enrollment rate relative to expectations, characteristics of 
participants, retention of participants, adherence to the protocol (potential or real protocol deviations) and data 
completeness. A protocol specific DSMC report will be completed and signed by the site Principal Investigator or 
by one of the co-investigators and sent to the DSMC quarterly. The DSMC will act in an advisory capacity to 
monitor participant safety, evaluate the progress of the study, to review procedures for maintaining the 
confidentiality of data, the quality of data collection, management, and analyses. All the above members of the 
DSMC are independent of the study team and are not on the IRB protocol. 
In the event of an AE, the first concern will be for the safety of the subject. As potato and corn starch are natural 
food products used for gluten free baking and cooking, we anticipate none to minimal risk to participants. As 
starch is a natural nutritional supplement used for gluten free baking and cooking, we anticipate none to minimal 
risk to participants. Some possible side effects to starch are flatulence (gas), abdominal bloating and chalky taste 
in the mouth. However, the majority of patients do not experience any symptoms when ingesting the dietary 
supplement. Below are the symptoms that may be experienced from the starch listed as possible, infrequent, and 
rare:
Possible 10-25 %: flatulence (gas), bloating, chalky taste in your mouth after drinking the starch, which resolves 
quickly
Infrequent 5-10 %: abdominal cramps, diarrhea, nausea, vomiting
Rare <5%: allergy to starch  
Although very minimal adverse events and no serious adverse events were observed in our preliminary data, we 
have compiled a list of possible adverse events (see table 3) that will need to be recorded by the research team at 
each site, reported to the research safety monitor and included on the quarterly reports to the protocol specific 
DSMC for the time period beginning with any amount of exposure to study treatment through at least 30 days 
after the last dose of study treatment.
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As aforementioned, the site PI will be informed of SAEs and UPIRSOs as soon as they occur by the study 
coordinator and will notify the protocol’s central safety research monitor within 48 hours of becoming aware of 
the event. Reportable SAEs and UPIRSOs will be reported to the local IRB according to the local IRB reporting 
guidelines. These events will be included on the quarterly reports to the protocol specific DSMC. Ad hoc reviews 
by the study specific DSMC will occur if there are unforeseen frequent SAEs.
Content of DSMC report (to be sent to the protocol specific DSMC quarterly and at time of interim analysis):
•Actual versus expected enrollment figures that illustrate recruitment and participation status
•Data tables that summarize demographic and baseline clinical characteristics
•Data quality tables that capture missing data
•Aggregate tables of AEs, SAEs, UPIRSOs, and prortocol deviations
•Listings of AEs, SAEs, UPIRSOs, and protocol deviations
Responsibilities of protocol specific DSMC may include:
•Reviewing the research protocol, and informed consent documents.
•Evaluating the progress of the study on an ongoing basis including periodic assessments of data quality, 
participant recruitment, accrual and retention, participant risk versus benefit, performance of study site(s), and 
other factors that can affect the outcome.
•Considering the impact of factors external to the study when new information, such as scientific or therapeutic 
developments becomes available that may affect safety of participants, their willingness to participate in the study 
or the ethics and conduct of the study.
•Reviewing UPIRSO, SAE, AE, and protocol deviation reports.
•Reporting any problems with study conduct or performance to the IRB.
•Ensuring the measures to ensure the confidentiality of study data and results are appropriate.
•Reviewing and evaluating requests for protocol modifications/amendments.
•Reviewing before study initiation the stopping rules and plans for interim analyses presented in the protocol. 
These plans outline the conditions under which a study may be stopped (e.g., difficulties in recruitment, retention, 
obtaining outcome measures or other issues).
•Reviewing the interim analyses and/or accumulating data at the specified interval(s), and as appropriate and 
make a recommendation to continue, terminate or modify the study based on observed benefit or harm in 
accordance with the planned stopping rules.
Section 12.  For multi-site studies for which the Yale PI serves as the lead investigator: How will adverse events 
and unanticipated problems involving risks to subjects or others be reported, reviewed and managed?
Multicenter Coordinating Plan.
We will have routinely scheduled video-conferences with all sites every two weeks to discuss any reported events 
or unanticipated problems. Our calls will include all study team members including students, research 
coordinators and all PIs. 
In order to coordinate and ensure ongoing communication, accurate data collection, and secure file sharing we 
will have developed the following plan: 
As mentioned, there will be video-conference with PIs, and study team members every two weeks. Initially the 
meetings will focus on study enrollment to discuss any issues meeting enrollment targets or capturing the patient 
population. During these meetings, a research assistant will take notes of key points that were discussed and will 
distribute this email to all study members. 
Both Yale and Michigan sites will use Yale OnCore to input all data. Michigan coordinators will be given access 
to the Yale OnCore/EDC and will sign a material transfer agreement with Yale. All data will be analyzed at Yale 
and will be saved on a secure server at a Yale desktop located at 60 Temple St, suite 6c, New Haven CT 06510.
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Yale will be the central data analysis site. All data will be analyzed by s a full time statistician at the Program of 
Applied Translational Research (Yu Yamamoto; main statistician). The Michigan site will input their data into the 
OnCore portal at Yale and all data will be analyzed at Yale. Michigan will draft and sign a material transfer 
agreement with Yale. 
Yale will serve as the Data Coordinating Center, to ensure that all data is accurate, valid and securely stored. 
Research Coordinators (led by Tanima Arora) will have meetings every 2 weeks to ensure the process of data 
collection and storage is done systematically across all sites. Any unanswered questions on these meetings will be 
brought up to the PIs during the every 2-week calls for this multicenter study.
As Yale is the primary site and the Yale PI is the primary PI, we will assure IRB review at Michigan (other site) 
and will collect all adverse events and UPIRSOs in the review as detailed under Data Safety Monitoring 
Committee. 
Audits and Inspections
The DSMC can request a ‘for cause’ quality assurance audit of the trial if the committee identifies a need for a 
more rigorous evaluation of study-related issues. 
The FDA has offered a Discretion Exemption to our IND application. However, other regulatory authority may 
also wish to conduct an inspection of the study, during its conduct or even after its completion. If an inspection 
has been requested by a regulatory authority, the study staff must immediately inform IRB, Medical School 
Regulatory Affairs, MIAP, and the Research Pharmacy (if providing study drug). 
The local site investigator at Michigan will immediately inform the Data Coordinating Center, Yale, if such a 
request has been made. 
Protocol Deviations
A protocol deviation is defined as noncompliance with the clinical trial protocol. The noncompliance may be 
either on the part of the subject, the investigator, or the study site staff. As a result of deviations, corrective 
actions are to be developed by the site and implemented promptly. 
Specific deviation plan for this protocol: Deviations in study treatment administration from protocol treatment 
plan will be recorded and reported to the IRB. Deviations in follow up procedures for the primary and secondary 
outcomes from protocol follow-up procedures will be recorded and reported to the IRB. Deviations in follow up 
procedures for exploratory outcomes from protocol follow-up procedures will be recorded but not reportable to 
IRB since follow up for exploratory outcomes, while important, is optional. 
All deviations must be addressed in study source documents, reported to the central research safety monitor 
within 2 weeks of identification, and reported quarterly to the DSMC. IRB reportable protocol deviations must be 
sent to the IRB per their policies. The site investigator is responsible for reporting deviations to the local IRB 
according to local IRB reporting guidelines. 
Subject information and Consent
Study team member will explain to each subject (or legally authorized representative) the nature of the study, its purpose, the 
procedures involved, the expected duration, the potential risks and benefits involved and any discomfort it may entail.  Each 
subject will be informed that participation in the study is voluntary and that he/she may withdraw from the study at any time 
and that withdrawal of consent will not affect his/her subsequent medical treatment or relationship with the treating 
physician.
We will contact patients via phone to perform an oral presentation of the study. After presenting the study to patients by 
phone, an informed consent document will be sent to the patient electronically for subjects to sign digitally. The plan of 
obtaining informed consent virtually was formulated in order to limit contact with COVID-19 positive patients as the 
alternative of approaching the patients in person will put the research staff and the community at large at risk as it will 
promote the spread of this highly infectious virus by brining these patients to the health system. 
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No subject can enter the study before his/her informed consent has been obtained.
The informed consent process and form are considered to be part of the protocol, and will be submitted for IRB approval.
Section 13. What provisions are in place for management of interim results? 
Interim analysis plans: 
Once our enrollment target for the secondary outcomes is reached (n~200), the DSMB and Yu Yamamoto (Bio 
Satistician) will perform an interim analysis to assess safety, feasibility, utility, futility, and treatment effect. 
Interim analysis 1(safety):
All adverse events will be summarized and the independent data safety monitoring committee (DSMC) will make 
recommendations regarding continuation of recruitment. 
Interim analysis 2 (feasibility):
Study enrollment, follow up and any withdrawals from the study will be summarized and discussed by IDSMC to 
see if the degree of missing data is acceptable and if any further efforts need to be taken to optimize enrollment 
and follow up. Successful feasibility will be defined as more than 60% of patients took at least 50% of their 
prescribed doses (as directed by study team). 
Interim analysis 3 (treatment effect): 
We will analyze the efficacy of RPS in relation to the primary outcome of hospitalization. If there is a significant 
difference between the two arm with p-value of <0.01, we will not continue the study. For data quality and 
integrity, we will also analyze the efficacy of RPS in relation to the secondary outcomes of TTCR and symptom 
severity score to assess efficacy and ensure no increase in harm in the intervention arm. 
Section 14. Statistical Considerations: Describe the statistical analyses that support the study design. 
Study design/Study outcomes measures: We will conduct a double-blinded, randomized clinical trial comparing 
RPS (~20g twice daily for 14 days) with placebo (non-resistant starch) in 1500 adults (age ≥18 years old) with 
COVID-19 diagnosis (defined by a positive swab) who are being managed in the outpatient setting. The primary 
outcome is hospital admission due to COVID-19 related complications. The secondary outcomes are TTCR and 
symptom severity score. We also will investigate some exploratory outcomes such as ER visits without 
admission, and among those hospitalized, we will explore differences in oxygen requirement, need for mechanical 
ventilation, duration of ventilation, length of hospital stay, levels of inflammatory markers routinely ordered as 
part of clinical care (CRP, LDH, D-dimer, Ferritin, Il-6), and rates of discharge between the RPS and placebo 
arms.
Sample size and accrual: Assuming a 14% admission rate in the placebo group, we calculated that a sample size 
of 1362 (we will enroll 1500 to account for 10% loss to follow up) will be required to provide 80% power (with a 
two-sided alpha level of 0.04 to detect an absolute reduction in hospital admission rates of 5% or more in the RPS 
group. The primary analysis will be based on the intention-to-treat principle, with all patients included in 
their assigned group. 
For our secondary outcomes, assuming a TTCR of about 14 days in the placebo group with standard deviation of 
5 days, we calculated that a sample size of 196 would be required to provide 80% power (with a two-sided alpha 
level of 0.05) to detect an absolute reduction in TTCR by 2 days or more in the RPS group. For the outcomes of 
symptom severity score, we assumed that the placebo group would have a peak score of 20 with a standard 
deviation of 5 points, and we calculated that a sample size of 32 patients would be required to provide 80% power 
(with a two-sided alpha level of 0.05) to detect an absolute reduction in symptom severity score of 5 points or 
more in the RPS group. 
Total accrual between all sites is 1500 patients. Depending on accrual rates, some sites may accrue more than 
other sites with a total goal of 1500 patients. 
Data analysis plan: The primary outcome of hospital admission rates will be compared with the use of Pearson's 
chi-square test. The secondary outcomes of TTCR and symptom severity score will be compared in the two 
groups by means of a two-sample t-test. Adjusted measures and subgroup effects for the primary and secondary 
outcomes will be analyzed with the use of logistic regression and linear regression, respectively. Generalized 
estimating equations and linear mixed models will be used to test for an interaction between treatment group and 
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site in primary and secondary outcomes, respectively. The alpha level will be set at 0.05 for all analyses, 95% 
confidence intervals will be calculated, and all comparisons will be two-tailed.
Interim analysis plans: 
Once our enrollment target for the secondary outcomes is reached (n~200), we will perform an interim analysis to 
assess safety, feasibility and treatment effect. 
Interim analysis 1(safety):
All adverse events will be summarized and the independent data safety monitoring committee (DSMC) will make 
recommendations regarding continuation of recruitment. None of the DSMC members will be on our IRB 
protocol or the study team.
Interim analysis 2 (feasibility):
Study enrollment, follow up and any withdrawals from the study will be summarized and discussed by IDSMC to 
see if the degree of missing data is acceptable and if any further efforts need to be taken to optimize enrollment 
and follow up. Successful feasibility will be defined as more than 60% of patients took at least 50% of their 
prescribed doses (as directed by study team). 
Interim analysis 3 (treatment effect): 
We will analyze the efficacy of RPS in relation to the primary outcome of hospitalization. If there is a significant 
difference between the two arm with p-value of <0.01, we will not continue the study. For data quality and 
integrity, we will also analyze the efficacy of RPS in relation to the secondary outcomes of TTCR and symptom 
severity score to assess efficacy and ensure no increase in harm in the intervention arm. 
Yale will be the central data analysis site. All data will be analyzed by a full time statistician at the Program of 
Applied Translational Research. 
Use of Placebo: 
If use of a placebo is planned, provide a justification which addresses the following:
a)
Describe the safety and efficacy of other available therapies. If there are no other available therapies, state 
this. As there are no current treatments for COVID-19, there is no other safe or efficacious therapy that we 
can use instead of placebo.
b)
State the maximum total length of time a participant may receive placebo while on the study. 
14 days.
c)
Address the greatest potential harm that may come to a participant as a result of receiving placebo. 
There should be no harm incurred by participants receiving placebo, which is corn starch (non-resistant 
digestible starch).  
d)
Describe the procedures that are in place to safeguard participants receiving placebo. 
We will perform interim analysis for efficacy to determine if early study termination may be needed if there is 
evidence of benefit in the intervention arm that precludes us to continue the study ethically. 
4.
Continuation of Drug Therapy After Study Closure   ☒Not applicable to this project
 
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SECTION III: RECRUITMENT/CONSENT AND ASSENT PROCEDURES 
1. Targeted Enrollment: Give the number of subjects: 
a.
Targeted for enrollment at Yale for this protocol: 500
b.
If this is a multi-site study, give the total number of subjects targeted across all sites: 1500
2.
Indicate recruitment methods below.  Attach copies of any recruitment materials that will be used.
☒Flyers
☐ Internet/web postings
☐ Radio
☐ Posters
☐ Mass email solicitation
☒ Telephone
☐ Letter
☐ Departmental/Center website
☐ Television
☒ Medical record review* 
☐ Departmental/Center research boards
☐ Newspaper
☐ Departmental/Center newsletters
☐ Web-based clinical trial registries
☐ Clinicaltrails.gov 
☐ YCCI Recruitment database
☒ Social Media (Twitter/Facebook): 
☒ Other: Testing Sites
* Requests for medical records should be made through JDAT as described at 
http://medicine.yale.edu/ycci/oncore/availableservices/datarequests/datarequests.aspx
3.  Recruitment Procedures: 
a. Describe how potential subjects will be identified. Via the use of a Joint Data Analytics Team (JDAT) 
compiled list of COVID-19 positive patients who are outpatients, we will contact patients via phone calls to 
ensure inclusion criteria and obtain phone consent. We will also post IRB-approved informational flyers at 
testing sites and on social media platforms.
b. Describe how potential subjects are contacted. Mainly via medical record review and phone calls.
c. Who is recruiting potential subjects? PIs and research assistants via phone. 
4. Assessment of Current Health Provider Relationship for HIPAA Consideration:
Does the Investigator or any member of the research team have a direct existing clinical relationship with any 
potential subject? 
☐Yes, all subjects
☒Yes, some of the subjects
☐No
If yes, describe the nature of this relationship. The PIs may be involved in the clinical care of the participants if 
they eventually become hospitalized, but at time of enrollment it is unlikely that any PIs will be involved in the 
care of the patient. 
5. Request for waiver of HIPAA authorization: (When requesting a waiver of HIPAA Authorization for either 
the entire study, or for recruitment purposes only.  Note: if you are collecting PHI as part of a phone or email 
screen, you must request a HIPAA waiver for recruitment purposes.)
Choose one: 
☐ For entire study 
☒ For recruitment/screening purposes only
☐ For inclusion of non-English speaking subject if short form is being used and there is no translated HIPAA 
research authorization form available on the University’s HIPAA website at hipaa.yale.edu.
i.
Describe why it would be impracticable to obtain the subject’s authorization for use/disclosure of this 
data: To limit contact with COVID-19 positive patients, the only way to request their permission to 
participate in our study will be via phone calls. To obtain phone numbers and do initial screening to 
ensure that participants meet the inclusion criteria we will have to access their medical records. 
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Approaching the patient directly will put the research staff at risk and the community at large as it 
will promote the spread of this highly infectious virus. 
ii.
If requesting a waiver of signed authorization, describe why it would be impracticable to obtain the 
subject’s signed authorization for use/disclosure of this data: We will obtain phone consent to 
commence the study and will ask patients to sign a formal consent form via email if feasible. 
Bringing the patients to a health care facility to ensure obtaining a singed authorization will put the 
research staff at risk and the community at large as it will promote the spread of this highly infectious 
virus.
The investigator assures that the protected health information for which a Waiver of Authorization has 
been requested will not be reused or disclosed to any person or entity other than those listed in this 
application, except as required by law, for authorized oversight of this research study, or as specifically 
approved for use in another study by an IRB.
Researchers are reminded that unauthorized disclosures of PHI to individuals outside of the Yale HIPAA-Covered 
entity must be accounted for in the “accounting for disclosures log”, by subject name, purpose, date, recipients, 
and a description of information provided.  Logs are to be forwarded to the Deputy HIPAA Privacy Officer.
6.
Process of Consent/Assent: Describe the setting and conditions under which consent/assent will be obtained, 
including parental permission or surrogate permission and the steps taken to ensure subjects’ independent 
decision-making. 
Study team member will explain to each subject (or legally authorized representative) the nature of the study, 
its purpose, the procedures involved, the expected duration, the potential risks and benefits involved and any 
discomfort it may entail.  Each subject will be informed that participation in the study is voluntary and that 
he/she may withdraw from the study at any time and that withdrawal of consent will not affect his/her 
subsequent medical treatment or relationship with the treating physician.
We will contact patients via phone to perform an oral presentation of the study. After presenting the study to 
patients by phone, an informed consent document will be sent to the patient electronically for subjects to sign 
digitally. The plan of obtaining informed consent virtually was formulated in order to limit contact with 
COVID-19 positive patients as the alternative of approaching the patients in person will put the research staff 
and the community at large at risk as it will promote the spread of this highly infectious virus by brining these 
patients to the health system. 
No subject can enter the study before his/her informed consent has been obtained.
The informed consent process and form are considered to be part of the protocol, and will be submitted for 
IRB approval.
7.
Evaluation of Subject(s) Capacity to Provide Informed Consent/Assent: Indicate how the personnel 
obtaining consent will assess the potential subject’s ability and capacity to consent to the research being 
proposed. 
Every patient will be assessed for capacity by ensuring that they have understanding of the research and are
able to repeat back what we discussed in a manner that expresses understanding. Any patients on heavy pain
medications will not be eligible for immediate consenting.
8.
Non-English Speaking Subjects: Explain provisions in place to ensure comprehension for research 
involving non-English speaking subjects. If enrollment of these subjects is anticipated, translated copies of all 
consent materials must be submitted for approval prior to use. 
We do not anticipate that any non-English speaking subjects will be enrolled.
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Note* If more than 2 study participants are enrolled using a short form translated into the same language, then the 
full consent form should be translated into that language for use the next time a subject speaking that language is 
to be enrolled.
Several translated short form templates are available on the HRPP website (yale.edu/hrpp) and translated HIPAA 
Research Authorization Forms are available on the HIPAA website (hipaa.yale.edu). If the translation of the short 
form is not available on our website, then the translated short form needs to be submitted to the IRB office for 
approval via modification prior to enrolling the subject.   Please review the guidance and presentation on use 
of the short form available on the HRPP website.
If using a short form without a translated HIPAA Research Authorization Form, please request a HIPAA 
waiver in the section above. 
9.
Consent Waiver: In certain circumstances, the HIC may grant a waiver of signed consent, or a full 
waiver of consent, depending on the study. If you will request either a waiver of consent, or a waiver of signed 
consent for this study, complete the appropriate section below.  
☒Not Requesting any consent waivers 
☐Requesting a waiver of signed consent:
☐ Recruitment/Screening only (if for recruitment, the questions in the box below will apply to 
recruitment activities only)
☐ Entire Study (Note that an information sheet may be required.)
 For a waiver of signed consent, address the following:
Would the signed consent form be the only record linking the subject and the research?  YES ☐  NO ☐ 
Does a breach of confidentiality constitute the principal risk to subjects? YES ☐  NO ☐
 
OR
Does the research pose greater than minimal risk? YES ☐    NO☐ 
Does the research include any activities that would require signed consent in a non-research context? YES ☐   
NO ☐
 ☐ Requesting a waiver of consent:
☐ Recruitment/Screening only (if for recruitment, the questions in the box below will apply to 
recruitment activities only)
☐ Entire Study 
 
For a full waiver of consent, please address all of the following:

Does the research pose greater than minimal risk to subjects?  
☐ Yes If you answered yes, stop. A waiver cannot be granted.  
☐ No

Will the waiver adversely affect subjects’ rights and welfare? YES ☐    NO☐

Why would the research be impracticable to conduct without the waiver? Write here

Where appropriate, how will pertinent information be returned to, or shared with subjects at a later date? 
Write here
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SECTION IV: PROTECTION OF RESEARCH SUBJECTS
    Confidentiality & Security of Data:
1.
What protected health information (medical information along with the HIPAA identifiers) about subjects 
will be collected and used for the research?  We will need subjects’ demographics such as age, sex, race, 
height, weight, and BMI. 
2.
How will the research data be collected, recorded and stored?  We will store all data on the 
protected/secure/encrypted Yale G drive/server. Other sites will send collected data securely via Yale secure 
file transfer. 
3.
How will the digital data be stored? Yale desktop computer.
4.
What methods and procedures will be used to safeguard the confidentiality and security of the identifiable 
study data and the storage media indicated above during and after the subject’s participation in the study? 
All information will be stored on a secured Yale drive. No personal laptops or computers will be used to store 
any of this information. 
All portable devices must contain encryption software, per University Policy 5100.  If there is a technical reason a 
device cannot be encrypted please submit an exception request to the Information Security, Policy and 
Compliance Office by clicking on url http://its.yale.edu/egrc or email it.compliance@yale.edu
5.
What will be done with the data when the research is completed? Are there plans to destroy the identifiable 
data? If yes, describe how, by whom and when identifiers will be destroyed. If no, describe how the data 
and/or identifiers will be secured. 
This information will be kept for five years. After that time it will be destroyed or de-identified, meaning we 
will replace the identifying information with a code that does not directly identify the participant. The 
principal investigator (PI) will keep a link that identifies the participant to the coded information, but this link 
will be kept secure and available only to the PI or selected members of the research team. Any information 
that can identify the participant will remain confidential. The research team will only give this coded 
information to others to carry out this research or to investigators approved for use of banked data.
6.
If appropriate, has a Certificate of Confidentiality been obtained? NA
SECTION V: POTENTIAL BENEFITS
Potential Benefits: Identify any benefits that may be reasonably expected to result from the research, either to the 
subject(s) or to society at large. (Payment of subjects is not considered a benefit in this context of the risk benefit 
assessment.) 
If our hypothesis is proven, this simple, minimal risk intervention, will have the potential to reduce healthcare 
burden and improve the outcomes of COVID-19 positive patients. 
         SECTION VI: RESEARCH ALTERNATIVES AND ECONOMIC CONSIDERATIONS
1.
Alternatives: What other alternatives are available to the study subjects outside of the research? 
NA, research participation is completely voluntary. As there are no current approved treatments for COVID-
19, there are no other standard of care treatments that participants can receive.
Participants may change their mind at any time. They are free to choose not to take part in this study. If they 
begin the study and later change their mind, they can withdraw at any time. Refusing to participate will 
involve no penalty or loss of benefits to which they are otherwise entitled (such as their health care outside the 
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study, the payment for their health care and their health care benefits). It will not harm their relationship with 
their own doctors. If they decide to withdraw from the study, they may withdraw by telling the study staff or 
sending written notice to the address provided in the consent form. 
Dr. Sherry Mansour, PO Box 208029, New Haven, CT 06520, (203) 737-3363
Payments for Participation (Economic Considerations): Describe any payments that will be made to 
subjects, the amount and schedule of payments, and the conditions for receiving this compensation.
none
2.
Costs for Participation (Economic Considerations): Clearly describe the subject’s costs associated with 
participation in the research, and the interventions or procedures of the study that will be provided at no cost 
to subjects. 
None
IMPORTANT REMINDERS
Will this study have a billable service?  Yes ☐  No☒
A billable service is defined as any service rendered to a study subject that, if he/she was not on a study, would 
normally generate a bill from either Yale-New Haven Hospital or Yale Medical Group to the patient or the 
patient’s insurer. The service may or may not be performed by the research staff on your study, but may be 
provided by professionals within either Yale-New Haven Hospital or Yale Medical Group (examples include x-
rays, MRIs, CT scans, specimens sent to central labs, or specimens sent to pathology). Notes: 1. There is no 
distinction made whether the service is paid for by the subject or their insurance (Standard of Care) or by the 
study’s funding mechanism (Research Sponsored). 2. This generally includes new services or orders placed in 
EPIC for research subjects. 
If answered, “yes”, this study will need to be set up in OnCore, Yale’s clinical research management 
system, for Epic to appropriately route research related charges. Please contact oncore.support@yale.edu
Are there any procedures involved in this protocol that will be performed at YNHH or one of its affiliated 
entities?  Yes ☐  No ☒ 
 
If you answered “no” to question 4a, or "yes" to question 4b or c, please contact the YNHH Department of 
Physician Services (688-2615) for prior approval before commencing with your research protocol.
IMPORTANT REMINDER ABOUT RESEARCH AT YNHH 
Please note that if this protocol includes Yale-New Haven Hospital patients, including patients at the HRU, the 
Principal Investigator and any co-investigators who are physicians or mid-level practitioners (includes PAs, 
APRNs, psychologists and speech pathologists) who may have direct patient contact with patients on YNHH 
premises must have medical staff appointment and appropriate clinical privileges at YNHH. If you are uncertain 
whether the study personnel meet the criteria, please telephone the Physician Services Department at 203-688-
2615. By submitting this protocol as a PI, you attest that you and any co-investigator who may have patient 
contact has a medical staff appointment and appropriate clinical privileges at YNHH.
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References
1. https://www.aha.org/news/headline/2020-03-18-cdc-looks-us-hospitalizations-covid-19
 2. VanWormer JJ, Sundaram ME, Meece JK, et al. A cross-sectional analysis of symptom severity in adults with 
influenza and other acute respiratory illness in the outpatient setting. BMC Infect Dis 2014; 14: 231.
 3. Englyst HN, Kingman SM, Hudson GJ, et al. Measurement of resistant starch in vitro and in vivo. Br J  Nutr 1996; 
75: 749-55
4. Raben, A., Tagliabue, A., Christensen, N.Jwt al. Resistant starch: the effect on postprandial glycemia, hormonal 
response, and satiety. Am J Clin Nutr 1994, 60; 544‐551.
5. Slavin, J.L. Carbohydrates, dietary fiber, and resistant starch in white vegetables: links to health outcomes. Adv 
Nutr 2013, 4; 351S‐355S.
6. Mehta P, McAuley DF, Brown M, et al. COVID-19: consider cytokine storm syndromes and immunosuppression. 
Lancet 2020; 395: 1033-1034.
7. Ruan Q, Yang K, Wang W, et al. Clinical predictors of mortality due to COVID-19 based on an analysis of data of 
150 patients from Wuhan, China. Intensive care medicine 2020.
8. Huang C, Wang Y, Li X, et al. Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China. 
Lancet 2020; 395: 497-506.
9. Chinese Clinical Trial Registry. In A multicenter, randomized controlled trial for the efficacy and safety of 
tocilizumab in the treatment of new coronavirus pneumonia (COVID-19).
10. Johansson EV, Nilsson AC, Ostman EM, et al. Effects of indigestible carbohydrates in barley on glucose 
metabolism, appetite and voluntary food intake over 16 h in healthy adults. Nutr J 2013; 12: 46.
11. Yang X, Darko KO, Huang Y, et al. Resistant Starch Regulates Gut Microbiota: Structure, Biochemistry and Cell 
Signalling. Cell Physiol Biochem 2017; 42: 306-318.
12. Venkataraman A, Sieber JR, Schmidt AW, et al. Variable responses of human microbiomes to dietary 
supplementation with resistant starch. Microbiome 2016; 4: 33.
13. Baxter NT, Schmidt AW, Venkataraman A, et al. Dynamics of Human Gut Microbiota and Short-Chain Fatty 
Acids in Response to Dietary Interventions with Three Fermentable Fibers. mBio 2019; 10.
14. Riwes M  SA, Braun T, et al. Rational modification of intestinal microbiome and metabolites after allogeneic 
hematopoietic stem cell transplantation with resistant starch: a pilot study. American Society of Hematology. 
2019;134(ABSTRACT 3276).
15. Li M, van Esch B, Henricks PAJ, et al. Time and Concentration Dependent Effects of Short Chain Fatty Acids on 
Lipopolysaccharide- or Tumor Necrosis Factor alpha-Induced Endothelial Activation. Front Pharmacol 2018; 9: 233.
16. Liu J, Chang G, Huang J, et al. Sodium Butyrate Inhibits the Inflammation of Lipopolysaccharide-Induced Acute 
Lung Injury in Mice by Regulating the Toll-Like Receptor 4/Nuclear Factor kappaB Signaling Pathway. J Agric Food 
Chem 2019; 67: 1674-1682.
17. Qinghua Cui CH, Xiagwen Ji, Wanlu Zhang, Fenghong Zhang, Liang Wang.: Possible inhibitors of ACE2, the 
receptor of 2019-nCoV. In, Preprints.org, 2020
18. Wang L, Zhu Q, Lu A, et al. Sodium butyrate suppresses angiotensin II-induced hypertension by inhibition of renal 
(pro)renin receptor and intrarenal renin-angiotensin system. J Hypertens 2017; 35: 1899-1908.
19. Ni YF, Wang J, Yan XL, et al. Histone deacetylase inhibitor, butyrate, attenuates lipopolysaccharide-induced acute 
lung injury in mice. Respir Res 2010; 11: 33.
20. Theiler A, Barnthaler T, Platzer W, et al. Butyrate ameliorates allergic airway inflammation by limiting eosinophil 
trafficking and survival. J Allergy Clin Immunol 2019; 144: 764-776.
21. Haak BW, Littmann ER, Chaubard JL, et al. Impact of gut colonization with butyrate-producing microbiota on 
respiratory viral infection following allo-HCT. Blood 2018; 131: 2978-2986.
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Attachments: 
Appendix A: Phone Questionnaire 
COVID-19 Symptom Severity Questionnaire1
Hello  “Enrolled subject”
I would like to assess the severity of your COVID-19 symptoms.  Please consider the severity of 
each symptom based on the following scale: absent, mild, moderate, or severe, to the best of your 
ability. Remember, If you experience severe symptoms, like shortness of breath, at any point 
during your evaluation for COVID-19, please call 911 to be emergently evaluated by a healthcare 
provider.
A. Over the past 2-3 days: 
B. What medication are you on currently?
Absent
Mild
Moderate
Severe
1) Do you have loss of taste or smell?
2) Do you have any bellyaches, 
diarrhea, or nausea/vomiting?
3) Do you have a cough?
4) Are you short of breath or wheezy 
on rest or exertion?
5) Do you have a fever or feel 
feverish?
6) Are you experiencing fatigue?
7) Do you have a headache?
8) Do you have muscle aches, pains, 
or cramps?
Name of 
drug
Dose
Frequency
Newly started within 
the past 2-3 days 
(Y/N)
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C. Have been taking your starch as instructed?  Y/N
If No, could you let us know why?
D. Have you experienced any side effects from the starch? Y/N
If yes, could you tell us about your symptoms?
This concludes the questionnaire.  You will be contacted every 2 days to review your symptoms.  If 
you have questions regarding your health or diagnosis of COVID-19, please contact your 
healthcare provider.
Reference
1.
VanWormer JJ, Sundaram ME, Meece JK, et al. A cross-sectional analysis of symptom severity in adults with 
influenza and other acute respiratory illness in the outpatient setting. BMC Infect Dis 2014; 14: 231.
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Appendix B: Instruction which will be sent to patient with the study treatment 
Dear Study Participant, 
Please take two tablespoons of the delivered starch once daily for three days. 
On the fourth day, please start taking two tablespoons of the delivered starch 
twice daily until day number 14. 
You can place the starch in any cool substance such as water, juice, or 
applesauce to make it more palatable. Please stir constantly while drinking and 
some residue may form on the bottom without stirring. 
Of note, it is not essential that you space out the two tablespoons by 12 hours, if 
you prefer you can take all 4 tablespoons at the same time. 
Please repeat the above steps for 14 days. By the end of 14 days you should 
have completed all the bag starch content. 
DAILY ON DAYS 1, 2 and 3.
DAILY 
FROM DAY 4 to DAY 14.
We thank YOU for volunteering to participate in this study during such a difficult 
time for the whole world. We are working together to fight this pandemic, and we 
thank you for being the most integral part of this fight. Your contribution to 
science will help us win this fight. We wish you health and a speedy recovery.
Sincerely, 
Study Team
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Appendix C: Potato starch product specification 
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Appendix D: Corn starch product specification 
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