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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 D3 is the common name for cholecalciferol. Vitamin D3 can be taken as a supplement to improve overall health or used to treat osteoporosis.