Vitamin D3
Research, explainedVitamin D supports calcium absorption. The benefit of extra intake depends on baseline status; a higher dose is not higher quality.
What was studied
VITAL tested 2,000 IU D3 daily in 25,871 men aged 50+ and women aged 55+. Overall, fractures were not reduced.
What remains uncertain
Participants were not selected for vitamin D deficiency. This finding does not replace treatment of a diagnosed deficiency.
Understanding the form
D3 can come from lanolin or a vegan source. Its chemical name alone proves neither vegan origin nor tested purity.
Reviewed: 2026-09-05 · Ingredient research does not test this product or its batch.