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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.
Foods. Very few foods naturally supply vitamin D. Beef liver, cheese, egg yolks and fatty fish, which contain small amounts of D3, are the best dietary sources of D3. Cod liver oil provide a time-honored potent source of D3, although the taste might be a turnoff.hoosing D2 or D3. Getting either vitamin D2 and D3 from supplements, sunlight exposure or foods will raise your 25(OH)D level. Some researchers believe that your body absorbs D3 more efficiently.