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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 D3 is a form of vitamin D that has whole body health effects. Photo Credit Jupiterimages/Comstock/Getty Images. Vitamin D3, or cholecalciferol, is one form of vitamin D that is usable by the human body, found in fish, eggs, fortified milk, cod liver oil and other fortified foods.