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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Vitamin D and Reduced Pain

Research synthesisModerate evidenceSmall effect4 studies · 3 beneficial · 1 neutral · 0 harmful

Across 4 studies, 3 reported beneficial effects of vitamin D on pain reduction, with effect sizes ranging from small to moderate. The evidence is strongest for clinical populations with specific pain conditions (e.g., sciatica, rheumatic diseases). Effects were typically observed in studies lasting 30 days or longer, though median study duration was only 30 days based on one reporting study.

  • Effective dose range: 800 IU/day
  • Studied populations: clinical populations with sciatica, rheumatic and musculoskeletal diseases (including osteoarthritis, rheumatoid arthritis), and infants/children with abdominal pain and disorders of the gut-brain interaction

Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Evidence base is small (only 4 studies) — conclusions should be considered preliminary. The one neutral study was a systematic review on total knee arthroplasty outcomes with a large sample (n=562), suggesting benefit may not generalize to post-surgical pain. Dosing data were sparse — only one study reported a specific regimen (800 IU/day), limiting dose-response conclusions.

Generated Jun 11, 2026
Doses used in studies
  • IU/day: 800 (median 800, IQR 800–800) — 1 study
Time to effect
Median: 4.3 weeks · IQR 4.3 weeks–4.3 weeks · Range 4.3 weeks–4.3 weeks — Reported in 1 of 4 studies
4 of 4 papers
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