<unk>  <unk>  is a synthetic vitamin D analog activated in the liver that does not require renal hydroxylation like vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol).<unk>  has a rapid onset of action (2 hours), a shorter half-life, and a greater effect on mineralization of bone salts than does vitamin
D.
Dihydrotachysterol
Cholesteryl ester
Glycerophospholipid
Piceatannol
1,4-Dioxane
Oleic acid
Choline c-11
Ioglicic acid