Inclusion Criteria:  Willing and able to provide written informed consent, or with a legal representative who can provide informed consent Aged ≥ 21 years (at all sites) Subjects that have been vaccinated with the first dose of a vaccine (any brand approved in Bahrain is permitted) to protect against COVID-19 infection  Exclusion Criteria:  Subject has acute or chronic type(s) of porphyria or a family history of porphyria. Subject has demonstrated previous intolerance of 5-ALA and/or SFC by topical or oral administration (except for photosensitivity) Pregnant or nursing women Males and females of reproductive potential who have not agreed to use an adequate method of contraception during the study. Subjects who are unable or unwilling to comply with requirements of the clinical trial. Participation in any other clinical trial of an experimental treatment for COVID-19 Subjects who may be excluded at the Investigator's discretion