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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.
Vitamin D is a fat-soluble vitamin that is responsible for numerous functions in the body, including calcium absorption, white blood cell production and blood pressure regulation. In addition, it might help boost levels of testosterone, a hormone associated with maleness.