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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.
The main function of vitamin D is to increase the intestinal absorption of calcium-a process that is crucial for good bone health. Vitamin D also helps strengthen the immune system and aids cell to cell communication in the body.