Vitamin D is a multifunctional micronutrient that exerts hormonal effects on many organs of the body. 1,25 dihydroxyvitamin D is the active metabolite of vitamin D, formed by dual hydroxylation in the liver and kidney.
Ronald B Brown, Fatme Al Anouti, Mohammed S Razzaque
(2016).
Vitamin D supplements: Magic pill or overkill?. UWSpace.
http://hdl.handle.net/10012/16012