Translations:Calcitriol/30/en

Calcitriol is, strictly, the 1-hydroxylation product of calcifediol (25-OH vitamin D₃), derived from cholecalciferol (vitamin D₃), rather than the product of hydroxylations of ergocalciferol (vitamin D₂). 1α,25-Dihydroxyergocalciferol (ercalcitriol) should be used for the vitamin D₂ product. However, the terminology of 1,25-dihydroxyvitamin D, or 1,25(OH)₂D, is often used to refer to both types of active forms of vitamin D. Indeed, both bind to the vitamin D receptor and produce biological effects. In clinical use, the differences are unlikely to have major importance.