Skip to main content
Evidence-Based Supplement Research
Evidence-Based Supplement Research
Pillser
Search
Sign UpLog In

Vitamin D and Improved Bone Mass Density

Research synthesisLow evidenceSmall effect3 studies · 1 beneficial · 2 neutral · 0 harmful

Across 3 studies, 1 reported a beneficial small effect on lumbar spine bone mineral density in older men, while 2 reported neutral small effects. The beneficial study used 2000 IU/day over a median of 1095 days (3 years) in generally healthy adults aged ≥70. The neutral studies included a meta-analysis in postmenopausal women with osteoporosis and a meta-analysis of high-dose (100,000 IU) vitamin D in older adults. Overall, evidence is mixed, with a small beneficial effect limited to a specific subgroup.

  • Studied populations: elderly adults (≥70 years), with a possible benefit in men; also studied in postmenopausal women with osteoporosis (neutral)

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests. The only beneficial effect was observed in a male subgroup of a single study, and the two neutral studies suggest that benefits may not generalize to postmenopausal women or to high-dose vitamin D regimens. Clinical significance of the small effect size is unclear.

Generated Jul 12, 2026
Doses used in studies
  • IU single-dose: 100,000 (median 100,000, IQR 100,000–100,000) — 1 study
  • IU/day: 2,000 (median 2,000, IQR 2,000–2,000) — 1 study
Time to effect
Median: 36.5 months · IQR 36.5 months–36.5 months · Range 36.5 months–36.5 months — Reported in 1 of 3 studies
3 of 3 papers
Back to top