Inclusion Criteria:  Provision of signed and dated informed consent form Stated willingness to comply with all study procedures and availability for the duration of the study Male or female, aged 18 years and older Ability to take oral medication and be willing to adhere to the prescribed dosing regimen Self-reported cold or flu symptoms for ≤ 36 hours  Exclusion Criteria:  Pregnant or actively seeking to become pregnant Positive for influenza with planned treatment with oseltamivir or baloxavir Chronic liver disease Acute secondary bacterial infection at the time of enrollment Requiring hospitalization for any reason at the time of enrollment History of copper or iron deficiency Current prescription for quinolone antibiotics, tetracycline antibiotics, or penicillamine at the time of enrollment Allergy/intolerance to any of the active ingredients under investigation including zinc citrate, green tea, and ascorbic acid (vitamin C) Patients without decision making capacity