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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 is a medication that is used to treat deficiency or help with calcium absorption in the treatment of osteoporosis. The prescribing information on vitamin D states that there is generally no side effects associated with the medication unless too much is taken.