teddylove932 teddylove932
  • 11-05-2018
  • Biology
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What form of vitamin d is the major circulating form with a half-life of approximately 3 weeks?

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BioWizard
BioWizard BioWizard
  • 21-05-2018
The correct answer is calcifediol or calcidiol.
It is a prehormone that is produced in the liver. The mechanism of production includes hydroxylation of vitamin D3 (cholecalciferol) by the enzyme cholecalciferol 25-hydroxylase. Because it is the major form of vitamin D in the blood, it is considered the best indicator of vitamin D status. Calcidiol is converted in the kidneys into calcitriol which is the active form of vitamin D. 
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