Skin: Your body takes in vitamins, turns them into inactive vitamon d and the sun then the kidneys activate it.Causes calcium absorptoin from GI tract.
Answered 6/1/2015
5.8k views
6 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
6 doctors weighed in across 2 answers
A doctor has provided 1 answer
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