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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.
Newer methods, however, may report levels of both D 2 and D 3 and then add them together for a total level. The main role of vitamin D is to help regulate blood levels of calcium, phosphorus, and (to a lesser extent) magnesium.