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Evidence-Based Supplement Research
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Vitamin D and Reduced Fracture Risk

Research synthesisLow evidenceSmall effect5 studies · 3 beneficial · 2 neutral · 0 harmful

Across 5 studies, 3 reported beneficial effects (small to moderate) on fracture risk, while 2 found neutral effects. The predominant effect size among beneficial studies was small. Evidence is strongest for menopausal and postmenopausal women, with some data supporting vitamin D-fortified foods. Studies using high-dose bolus administration showed neutral results, and the most recent large-scale trials have failed to replicate earlier benefits, suggesting effect may be limited to certain populations or formulations.

  • Studied populations: menopausal women, older adults

Caveats: Available evidence is overwhelmingly positive (3 of 5 studies beneficial) — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). However, two of the higher-quality studies (both with evidence score 4) found neutral effects, including a meta-analysis of older adults that showed no significant fracture reduction at doses up to <4000 IU/day. The most recent large-scale RCTs have failed to replicate earlier epidemiological benefits, particularly in vitamin D-replete populations.

Generated Jun 11, 2026
Doses used in studies
  • IU/day: 2,000–4,000 (median 3,000, IQR 2,000–4,000) — 1 study
Safety in these studies
5 of 5 papers
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