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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Vitamin D and Reduced C-Reactive Protein Levels

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

Across 4 studies, 3 reported beneficial moderate-sized effects of vitamin D supplementation on reducing C-reactive protein (CRP) levels, while 1 study found no effect. The beneficial studies were meta-analyses or systematic reviews, with effects observed in clinical populations (obese/overweight, diabetes/prediabetes). Dose ranges and study durations were not consistently reported, precluding identification of a typical regimen or treatment window.

  • Studied populations: obese/overweight adults, patients with diabetes and prediabetes

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. Effect modest and inconsistent — clinical significance unclear. Most beneficial studies tested co-supplementation with other nutrients (magnesium, vitamin D/E), complicating attribution of effect to vitamin D alone.

Generated May 12, 2026
4 of 4 papers
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