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A 2022 meta-analysis of 41 RCTs (n=53,235) found that vitamin D supplementation significantly reduced depressive symptoms compared to placebo (ES = -0.317, 95% CI: -0.405 to -0.230, p < 0.001). Effects were strongest in those with baseline vitamin D deficiency and diagnosed depressive disorders.
| Study | Participants | Finding | Quality |
|---|---|---|---|
Vitamin D supplementation and depression: a systematic review and dose-response meta-analysis of randomized controlled trials Musazadeh V, Keramati M, Misra A, et al. — Nutrition Reviews (2023) | 53,235 | Vitamin D supplementation significantly reduced depressive symptoms with a dose-response relationship | High |
For individuals with depressive symptoms and vitamin D deficiency (<20 ng/mL), supplementation with 2,000-4,000 IU/day of vitamin D3 for at least 8 weeks is a low-risk adjunctive intervention. Vitamin D supplementation should complement, not replace, standard depression treatment.
A comprehensive umbrella meta-analysis examining the effects of vitamin D supplementation on depressive symptoms across 41 randomized controlled trials involving 53,235 participants.
Evidence suggests yes, particularly for those who are vitamin D deficient. A 2022 meta-analysis of 41 RCTs found a statistically significant reduction in depressive symptoms with vitamin D supplementation (effect size -0.317). The benefit was most pronounced in people with diagnosed depression and baseline deficiency.
Clinical trials showing mood benefits used doses of 2,000-4,000 IU/day of vitamin D3 for at least 8 weeks. Getting your 25(OH)D blood levels tested first is recommended, as benefits are strongest in those with levels below 20 ng/mL. Aim for a target level of 30-50 ng/mL.
No. Vitamin D supplementation should be considered an adjunct to, not a replacement for, standard depression treatment. The effect size (ES = -0.317) is smaller than typical antidepressant effect sizes. However, correcting a deficiency may improve response to other treatments.