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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 B3 (niacin) is important for the body because it helps to: 1  Convert food into glucose, used to produce energy. 2  Produce macromolecules, including fatty acids and cholesterol. 3  Facilitate DNA repair and stress responses.