Reaction catalyzed by vitamin D 25-hydroxylase (1.14.14.24)
+
+
NADPH
+
=
+
NADP+
+
H2O
vitamin D3
+
O2
+
NADPH
+
H+
=
1alpha, 25-dihydroxy-vitamin D3
+
NADP+
+
H2O
