Vitamin D supplements improved depression symptoms
In one study, doctors measured vitamin D levels in 54 Swedish adolescents with depression and found 89 percent were deficient. Forty-eight began taking 4,000 IU of vitamin D per day for a month, then 2,000 IU per day for two more months.

Vitamin D levels rose from 41 nanomoles per liter of blood (nmol/L) at the start of the study to 91 nmol/L at the end. As vitamin D levels increased, feelings of well-being also rose. In eight of nine areas (feeling depressed, irritable, tired, mood swings, difficulty sleeping, weakness, ability to concentrate, and pain), well-being improved.

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