Higher vitamin D dose showed no clear advantage for depression symptoms
A randomized trial tested whether more vitamin D improved symptoms more than a lower dose when added to ongoing depression care.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The higher vitamin D dose did not show superior improvement in depressive symptoms when added to existing treatment. The estimated difference was small, and its confidence interval included no difference. This result does not prove the doses are equivalent or establish whether either dose helps compared with taking no vitamin D.
This abstract-based brief cannot explain why some participants lacked outcome data. Because both groups received vitamin D, the trial also cannot establish a benefit compared with no supplementation.
What researchers found
Change in depression symptoms on the MADRS scale
Higher versus lower vitamin D dose over 6 months; standardized difference in score changes, without statistical significance.
What the trial measured
Researchers asked whether adding more vitamin D to ongoing depression treatment would improve symptoms more than adding less. They compared changes on the Montgomery-Åsberg Depression Rating Scale, which was the main outcome.
How to read the result
The confidence interval spans negative and positive values, so the estimated difference remains uncertain. A result that is not statistically significant does not show that the doses have equal effects.
The original publication
Effect of a six-month vitamin D supplementation on depressive symptoms in patients with major depressive episode (DepFuD): a double-blinded randomised controlled trial.
Mikola T, Lehto SM, Tolmunen T et al.
J Affect Disord · 2026
- PubMed ID
- 41933624
- Record checked
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