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Depression might be reduced by vitamin D – meta-analysis March 2014

Vitamin D Supplementation for Depressive Symptoms: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.

Psychosom Med. 2014 Mar 14. [Epub ahead of print]
Shaffer JA, Edmondson D, Wasson LT, Falzon L, Homma K, Ezeokoli N, Li P, Davidson KW.
Center for Behavioral Cardiovascular Health (J.A.S., D.E., L.T.W., L.F., K.H., K.W.D.), Columbia University Medical Center, New York, New York; Department of Chemistry (N.E.), School of Humanities & Sciences, Stanford University, Stanford, California; and Department of Mathematics (P.L.), College of Arts and Sciences, New York University, New York, New York.
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Note: Only one trial used enough of vitamin D for more than 8 weeks

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Objective: The aim of this study was to review the effects of vitamin D supplementation on depressive symptoms in randomized controlled trials. Although low vitamin D levels have been observationally associated with depressive symptoms, the effect of vitamin D supplementation as an antidepressant remains uncertain.

Methods: MEDLINE, CINAHL, AMED, PsycINFO, Scopus, The Cochrane Library, and references of included reports (through May 2013) were searched. Two independent reviewers identified and extracted data from randomized trials that compared the effect of vitamin D supplementation on depressive symptoms to a control condition. Two additional reviewers assessed study quality using The Cochrane Risk of Bias Tool. Seven trials (3191 participants) were included.

Results: Vitamin D supplementation had no overall effect on depressive symptoms (standardized mean difference [SMD], 0.14; 95% confidence interval [CI], -0.33 to 0.05, p = .16), although considerable heterogeneity was observed. Subgroup analysis showed that vitamin D supplementation for participants with clinically significant depressive symptoms or depressive disorder had a moderate, statistically significant effect (2 studies: SMD, -0.60; 95% CI, -1.19 to -0.01; p = .046), but a small, nonsignificant effect for those without clinically significant depression (5 studies: SMD, -0.04; 95% CI, -0.20 to 0.12; p = .61).
Most trials had unclear or high risk of bias.
Studies varied in the amount, frequency, duration, and mode of delivery of vitamin D supplementation.

Conclusions: Vitamin D supplementation may be effective for reducing depressive symptoms in patients with clinically significant depression; however, further high-quality research is needed.

PMID: 24632894


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7993 Depression RCT best.jpg admin 15 May, 2017 19:31 43.27 Kb 21
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