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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 D (ergocalciferol) is important for the absorption of calcium from the stomach and for the functioning of calcium in the body. It can be used for many purposes and the dose is related to what it is being used for.: Vitamin D is used to help with the absorption of calcium, to promote healthy bones and prevent osteoporosis. The upper end dose should not exceed 2,000 units per day, as it is not water-soluble and can build up toxic levels in the fat.