Research synthesisModerate evidenceSmall effect7 studies · 4 beneficial · 3 neutral · 0 harmful
Across 7 studies, 4 reported beneficial small-sized effects of vitamin D supplementation on reducing triglyceride levels, while 3 found neutral effects. The evidence is strongest in clinical populations such as type 2 diabetes, gestational diabetes, and metabolic-associated fatty liver disease. Median study duration was 42 days, but this is based on only 1 study.
- Studied populations: clinical populations (type 2 diabetes, gestational diabetes, metabolic-associated fatty liver disease, polycystic ovary syndrome) and overweight/obese children
Caveats: While the majority of studies show a beneficial effect, nearly half (3 of 7) reported no significant improvement, suggesting the effect may be modest and context-dependent. Most trials involved clinical populations with metabolic conditions, so benefits may not generalize to healthy individuals. Duration data are limited (only 1 study reported a specific intervention period).
Generated Jun 14, 2026