Natural Medicines Newsletter

Volume 3, Issue 24, 06/29/2011

Question

Does the use of sunscreen prevent the activation of vitamin D supplements and their ability to increase calcium absorption?

Answer

Vitamin D is a well known fat soluble vitamin that is important for maintaining calcium and phosphate homeostasis, mineralization of the bone, and the modulation of gene expression, cell growth and differentiation.(1-3)   As it relates to calcium absorption from the gastrointestinal (GI) tract, vitamin D in the body must be activated before it can facilitate or increase GI absorption of calcium.(1-4) 

Vitamin D can come from one of three sources.(1-3,5,6)  The first occurs when the skin is...

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