Vitamin A
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A fat-soluble vitamin important for vision and immune function, obtained from animal sources as retinol or from plant sources as provitamin A carotenoids like beta-carotene, and added to supplements in either form.
Why it’s used
Taken to support vision, immune function, and skin health, and to correct deficiency where diet is insufficient.
What the evidence is for
supporting vision and immune function, and correcting deficiency.
What the evidence says
NIH ODS describes vitamin A's role in vision and immune function, and its importance in preventing deficiency, as well established, particularly in populations with limited dietary access. Evidence for benefit from supplementation in well-nourished populations without deficiency is limited, and excess preformed vitamin A has been linked to toxicity.
Dose studied
700–3000 mcg — RDA to tolerable upper intake level for adults, per NIH ODS.
Context
Much of the strongest evidence for vitamin A supplementation comes from studies in populations with widespread dietary deficiency, which limits how directly it applies to supplement use in well-nourished settings.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.