Vitamin D
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A fat-soluble vitamin the body can also produce from sun exposure, available in supplements as vitamin D2 (ergocalciferol) or D3 (cholecalciferol).
Why it’s used
Taken to support calcium absorption and bone health, and to correct low vitamin D status.
What the evidence is for
raising serum 25-hydroxyvitamin D and correcting deficiency.
What the evidence says
NIH ODS reports strong evidence that vitamin D raises serum 25-hydroxyvitamin D levels and corrects deficiency, with clear links to bone health. Evidence for other proposed benefits, such as immune or mood effects in people who are not deficient, remains inconsistent.
Dose studied
15–100 mcg — RDA to tolerable upper intake level for adults, per NIH ODS.
Context
Clinical trials often stratify results by baseline vitamin D status, and effects on outcomes like fracture risk are most apparent in people who started out deficient.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.