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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 D has several important roles â for example, it helps control the amount of calcium and phosphate in your body, which are needed to keep your bones and teeth healthy. Having too little vitamin D (a deficiency) can damage the way your body absorbs calcium and phosphorus.