(cholecalciferol, ergocalciferol, sunshine vitamin)
Although once considered as, vitamin D3 (cholecalciferol) is now considered as hormone that is closely associated with the regulation of calcium and phosphorus.
Its name as the vitamin is from early 20th of the last century, marking the active ingredient contained in cod liver, which can prevent rickets, a disease that is characterized by a disturbance in ossification, disruption of calcium adsorption, general weakness and deformity of bones.
Vitamin D can be produced in the skin if it is exposed to the ultraviolet radiation.
Vitamin D is an essential nutrient only in people who are not exposed to sunlight, which meets the classical criteria for the status of vitamins.
Vitamin D means a group of several related compounds (sterol derivatives) of plant or animal origin, which is characterized by an antirickets action.
Rickets often occurs in environments where there is a high environmental pollution