Ongoing and future trials registered on clinicaltrials.gov were also recorded, appraised, and considered in conjunction with the literature findings. 
clinicaltrials.gov
Journal of evidence-based integrative medicine
D000975:Antioxidants; D002186:Cannabinoids; D019587:Dietary Supplements; D006801:Humans; D008550:Melatonin; D018977:Micronutrients; D009536:Niacinamide; D010936:Plant Extracts; D059808:Polyphenols; D019936:Probiotics; D000086402:SARS-CoV-2; D000093485:COVID-19 Drug Treatment
Hermel Melody M 0000-0001-8311-4326;Sweeney Megan M ;Ni Yu-Ming YM ;Bonakdar Robert R ;Triffon Douglas D ;Suhar Christopher C ;Mehta Sandeep S ;Dalhoumi Sarah S ;Gray James J 0000-0001-5603-7054