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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 D is unique among vitamins; you can synthesize it in your skin as well as absorb it from foods or supplements. To complicate things further, vitamin D also comes in two forms: D2 and D3. Your skin synthesizes vitamin D3, also called cholecalciferol; you can also take D3 in supplement form.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.