Myth-buster
Even at 3,200 IU/day, vitamin D3 didn't reduce falls in a 5-year trial of 2,495 healthy older adults — who already had adequate levels
This large, long-term RCT challenges the common assumption that high-dose vitamin D prevents falls, but it's one study — the overall body of evidence on this specific pairing is still thin, so the picture isn't settled.
Researchers gave 1,600 or 3,200 IU of vitamin D3 daily for five years to generally healthy older adults who were already vitamin D-sufficient. Neither dose lowered the risk of falling or fall-related injuries compared to placebo. For people with normal vitamin D levels, extra supplementation appears unlikely to provide a fall-prevention benefit.
Where this fits in the evidence
This is among the first studies we've indexed on Vitamin D3 for Reduced Fall Risk — treat it as an early signal until more research accumulates.
The study
- Randomized Controlled Trial (RCT)
- n = 2,495
- 2026-01-13
- Journal of the American Geriatrics Society
- PubMed: 41531181
- DOI: 10.1111/jgs.70295
- Full study breakdown →
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.