Vitamin D3

Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and multiple other biological effects.In humans, the most important compounds in this group are vitamin D3 (also known as cholecalciferol) and vitamin D2 (ergocalciferol).Cholecalciferol and ergocalciferol can be ingested from the diet and from supplements.Only a few foods, such as the flesh of fatty fish, contain significant amounts of vitamin D.