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Vitamin D

Vitamin D is a group of fat-soluble secosteroids responsible for intestinal absorption of calcium and phosphate. In humans, the most important related compounds of vitamin D are vitamin D2 and vitamin D3. Cholecalciferol (vitamin D3) and ergocalciferol (vitamin D2) are unique as they constitute what we know as vitamin D and can be ingested from the diet and/or supplements. The body can also synthesize vitamin D (from cholesterol) when sun exposure is adequate (hence its nickname, the "sunshine vitamin").