<unk>  (INN), also known as calcidiol, 25-hydroxycholecalciferol, or 25-hydroxyvitamin D (abbreviated 25(OH)D),  is a prehormone that is produced in the liver by hydroxylation of vitamin D3 (cholecalciferol) by the enzyme cholecalciferol 25-hydroxylase which was isolated by Michael F. Holick. Physicians worldwide measure this metabolite to determine a patient's vitamin D status.<unk>  is then converted in the kidneys (by the enzyme 25(OH)D-1α-hydroxylase) into calcitriol (1,25-(OH)2D3), a secosteroid hormone that is the active form of vitamin D.  It can also be converted into 24-hydroxycalcidiol in the kidneys via 24-hydroxylation.
Calcifediol
Chenodiol
Ursodiol
Masoprocol
Asciminib
Colestipol
Vincamine
Chenodeoxycholic acid