What depletes your body of vitamin D?

What would cause a person's vitamin D level to keep dropping, even beside pharmaceutical supplementation? More specificallly, what eats up vitamin D?
The main source of vitamin D is our own body and dietary source is also important. Its first precursor is produced within the skin exposed to sunlight, the active metablolite is then produced as a result of transformations in the kidneys and liver to 1,25 dihydroxycholecalciferol or calcitriol. Renal transformation is stimulated by parathyroid hormone and the second is produced as a result of hypocalcemia. Hypercalcemia could lead to less production and transformation to the active form of vitamin D.

Vitamin D negative amount can result from inadequate intake coupled with inadequate sunlight exposure, disorders that constrain its absorption, conditions that impair conversion of vitamin D into active metabolites, such as liver or kidney disorders, or, rarely, by a little hereditary disorders.

Vitamin D and its metabolites are excreted mainly through the bile and a small part through urine and the bile is also essencial for dietary absorsion of vitamin D contained by the intestine.
Vitamin D is one of the vitamins that your body does not naturally make on its own. The kidneys and... another organ... work together to make vitamin D from the sunlight that your skin absorb. If you don't get enough sun, or your kidneys are not up to snuff, you can easily be low surrounded by vitamin D.

If you are the person in question, this is a conversation you should be have with your doctor. There's more information about vitamin D on the website I linked here. Source(s): http://www.webmd.com/diet/vitamins-suppl…

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