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Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.
One theory is that vitamin D affects the amount of chemicals in your brain, like serotonin. Vitamin D is important for good bone health and researchers are now discovering that vitamin D may be important for many other reasons.here are a number of good research studies from the last few years that look specifically at vitamin D and depression. In a review of research about vitamin D and depression in 2013, 9 researchers looked for and analysed all of the published research about depression and vitamin D up until February 2011.