Vitamin D3

Vitamin D is a fat-soluble secosteroid, that is, a steroid molecule with an open ring. It can be produced by the human body endogenously: for example, by exposure of the skin to sunlight. Vitamin D refers to five compounds (vitamins: D1, D2, D3, D4 and D5), of which the most important are: vitamin D2 ergocalciferol vitamin D3 cholecalciferol...