How many studies support Vitamin D?
A large meta-analysis in the BMJ and an earlier meta-analysis both found vitamin D supplementation modestly reduces all-cause mortality, though effects are inconsistent across trial populations. That's backed by 11 published studies in Vitaebase's database, including 10 meta-analyses, the most recent from 2026 -- a fairly substantial body of research for a single topic.
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Vitamin D
Moderate evidence
Evidence
51
Impact
36