Calcitriol
Calcitriol (INN) ( /ˌkælsɨˈtraɪ.ɒl/; /kælˈsɪtri.ɒl/), also called 1,25-dihydroxycholecalciferol or 1,25-dihydroxyvitamin D3, is the hormonally active form of vitamin D with three hydroxyl groups (abbreviated 1,25-(OH)2D3 or simply 1,25(OH)2D), which was identified by Michael F. Holick. It increases the level of calcium (Ca2+) in the blood by (1) increasing the uptake of calcium from the gut into the blood, and (2) possibly increasing the release of calcium into the blood from bone.
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