“Vitamin D?”Here!
Appears in 2 scanned products.
As a supplement
Talk to your doctor or pharmacist.
Roll Call does not check drug interactions or assess personal safety.
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.
Rumors
Correcting vitamin D deficiency, which causes rickets — soft bones and skeletal deformity — in children, and osteomalacia, weak and painful bones, in adults.
Supports — establishedhealth and safety evidence
Measured as a biomarker.
- Office of Dietary Supplements - Vitamin D (Regulatory) · Funding not checked
How much is a reference amount
- 15 mcg a dayfor adults 19–50 · Recommended Dietary Allowance
Upper limit 100 mcg a day, from food and supplements together.
- 15 mcg a dayfor adults 51–70 · Recommended Dietary Allowance
Upper limit 100 mcg a day, from food and supplements together.
- 20 mcg a dayfor adults 71 and over · Recommended Dietary Allowance
Upper limit 100 mcg a day, from food and supplements together.
15 mcg is 600 IU and 20 mcg is 800 IU; the UL of 100 mcg is 4,000 IU. Stored in mcg. A label in IU cannot be compared without conversion, and 028's standing rule is that the card blocks the comparison rather than converting silently.
Every applicable line is shown because we don’t know which one is yours, and a reference intake is a target for a population, not a threshold for harm.