Studies

The available research shows an uneven relationship between vitamin D and inflammation. Some trials in people with low vitamin D and inflammatory conditions report improvements in inflammatory markers, and selected disease-specific research also finds better symptoms or disease activity. These findings suggest potential benefit in particular settings rather than a universal effect.

Many controlled trials find no reduction in inflammation, including research in obesity, diabetes and knee osteoarthritis. Correcting low blood vitamin D does not guarantee an anti-inflammatory response. Even when a marker improves, the change may not persist or extend to other markers, and its effect on meaningful health outcomes can remain uncertain.

Low vitamin D is often associated with greater inflammation, but observational associations alone cannot establish cause or predict a supplement response. Genetic research suggests deficiency may contribute in some circumstances. Studies using injections or specialized oral regimens for experimentally induced skin inflammation are also distinct from routine oral supplementation. Overall, the strongest interpretation is a possible selective benefit, with inconsistent evidence for broadly reducing chronic inflammation.

101 linked studies · 26 sampled for detail · Sep 27, 2026