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

Vitamin D and Reduced Body Mass Index

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

Across 4 studies, 3 reported neutral small effects and 1 reported beneficial moderate effects. The predominant effect direction is neutral, with small effect sizes. No consistent dose or form data were available; populations studied include women with PCOS and overweight/obese children.

  • Studied populations: women with PCOS, overweight/obese children

Caveats: Evidence base is small (only 4 studies) and conclusions should be considered preliminary. The only study showing benefit combined vitamin D with Salacia reticulata, not vitamin D alone; observational associations (first study) may not imply causality. Most RCTs found no significant effect on BMI in children and adults. Many of the included studies did not reach statistical significance (2 of 4 significant), suggesting the effect may be smaller than the predominant direction implies.

Generated May 14, 2026
Safety in these studies
4 of 4 papers
Back to top