Intervention	Vitamin A
Suggested dose	Up to 10 000–25 000 IU/d
Mechanism(s) of action against non-COVID-19 viruses95,96	Favorably modulate cellular defense and repair mechanisms: Modulation of helper T cells Modulation of sIgA Favorably modulate viral-induced pathological cellular processes: Modulation of cytokine production
Outcomes data supporting their mitigating effects on illness from other viral strains	No data available
Strength of evidence	Conditional
Risk of harm97-102	Mimimal, if does not exceed this dose; caution: pregnancy