Past studies have suggested that vitamin D deficiency may lead to depression. In response, other studies propose that increasing vitamin D levels with supplements may reduce depressive symptoms. But new research, published in the journal Psychosomatic Medicine, has found no evidence that vitamin D supplements reduce depression.The research team, led by Dr. Jonathan A. Schaffer of the Columbia University Medical Center (CUMC) in New York, NY, conducted a systematic review of clinical trials that looked at how vitamin D supplementation affected depression.

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