१,२५-डाईहाईड्रॉक्सीकॉलेकैल्सिफेरॉल

Also known as Calcijex®, Rocaltrol®, (1S,3R,5Z,7E)-9,10-secocholesta-5,7,10-triene-1,3,25-triol, 1alpha,25-dihydroxyvitamin D3, (1alpha,3beta,5Z,7E)-9,10-secocholesta-5,7,10(19)-triene-1,3,25-triol, 1,25-DHCC, (5Z,7E)-(1S,3R)-9,10-secocholesta-5,7,10(19)-triene-1,3,25-triol, 1alpha,25-dihydroxycholecalciferol

Calcitriol is a hormone and the active form of vitamin D, normally made in the kidney. It is also known as 1,25-dihydroxycholecalciferol. It binds to and activates the vitamin D receptor in the nucleus of the cell, which then increases the expression of many genes. Calcitriol increases blood calcium mainly by increasing the uptake of calcium from the intestines.