Sunlight: Sunlight on the skin helps convert cholecalciferol to 25 hydroxycholecalciferol. Then the kidney adds another hydroxy to make 1, 25 dihydroxycholecalciferol which is active vitamin d.
Answered 5/2/2013
5.1k views
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question