24,25-ジヒドロキシコレカルシフェロール

Also known as 24,25-Dihydroxyvitamin D₃, 24-Hydroxycalcidiol

24,25-Dihydroxycholecalciferol, also known as 24,25-dihydroxyvitamin D3, refers to a mixture of epimers hydroxycalcidiol and hydroxycalcidiol (abbreviated as and ) closely related to 1,25-dihydroxyvitamin D3, the active form of vitamin D3. Like vitamin D3 itself and calcifediol (25-hydroxyvitamin D3), it is inactive as a hormone both in vitro and in vivo. It was first identified in 1972 in the laboratory of Hector DeLuca and Michael F. Holick.