Research · Randomized controlled trial
The Effects of Four Doses of Vitamin D Supplements on Falls in Older Adults: A Response-Adaptive, Randomized Clinical Trial (STURDY)
What it found
Higher-dose vitamin D did not prevent falls; 2000 and 4000 IU/day had higher fall/death rates than 1000 IU/day — suggesting no benefit and possible harm at higher doses.
- Design
- Randomized controlled trial
- Year
- 2021
- Sample size
- 688
- Population
- community-dwelling adults aged ≥70 at elevated fall risk
- Intervention
- vitamin D3 200 (control), 1000, 2000, or 4000 IU/day
- Outcome
- time to first fall or death
- Journal
- Annals of Internal Medicine
Citation last checked 2026-06-21.