Bioavailable vitamin D in chronic kidney disease.

Brown, Alex J; Coyne, Daniel W · Kidney Int · 2012

editorial · Level V

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Abstract

Most of the major vitamin D metabolites 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D circulates in a tightly bound state to vitamin D-binding protein (DBP), rendering this fraction unavailable for biological action. A smaller fraction, loosely bound to albumin or circulating freely, is bioavailable, and hence bioactive. This Commentary discusses the free hormone hypothesis and the role of DBP in vitamin D metabolism.

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