7-Dehydrocholesterol

Cholecalciferol is formed in the skin from 7-dehydrocholesterol with the help of UV radiation. Cholecalciferol is gradually hydroxylated in the liver and kidneys to 1,25-dihydrocholecalciferol − calcitriol (the most effective form of vitamin D ).

related articles

 * Ultraviolet radiation (biophysics)
 * 1,25-dihydrocholecalciferol
 * 25-Hydroxycholecalciferol