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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 helps reduce inflammation and insufficient vitamin D is associated with a range of inflammatory conditions. In combination with calcium, vitamin D also promotes weight loss. There are estimates that say that two-thirds of the population in the United States is vitamin D deficient.