Essential Biochemistry - Vitamins (Section 5 - No. 21)
Functionally active form of vitamin D is:
1,25-dihydroxycholecalciferol
24,25-dihydroxycholecalciferol
25-hydroxycholecalciferol
1,24-dihydroxycholecalciferol
הֶסבֵּר
1,25-dihydroxycholecalciferol is the functionally active form of Vitamin D.