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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.
a vitamin d3 or cholecalciferol is a d vitamin that is important for the absorption of calcium from the stomach and for the functioning of calcium in the body it is used to treat or prevent many conditions caused by a lack of vitamin d especially conditions of the skin or bones