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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.
In addition to the health benefits already mentioned above, optimizing your vitamin D levels can help protect against: 1  Cardiovascular disease. 2  Vitamin D is very important for reducing hypertension, atherosclerotic heart disease, heart attack, and stroke.