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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 Stacy Wiegman, PharmD, Pharmacy, answered. Cholecalciferol, a form of vitamin D (vitamin D3) is used to prevent and treat vitamin D deficiencies in children and adults. If children have a vitamin D deficiency, they have an increased risk of developing a disease called rickets.