Talk:Vitamin D

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 Definition:  Fat-soluble vitamin occurring in several forms, required for normal growth of teeth and bones, produced by ultraviolet irradiation and sterols found in milk, fish, and eggs. [d] [e]
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D2 vs. D3 potency

Regarding

Vitamin D2 and vitamin D3 are of equal potency.[5]

interesting new data in

The Journal of Clinical Endocrinology & Metabolism Vol. 89, Vitamin D2 Is Much Less Effective than Vitamin D3 in Humans

"Vitamins D2 and D3 are generally considered to be equivalent in humans. Nevertheless, physicians commonly report equivocal responses to seemingly large doses of the only high-dose calciferol (vitamin D2) available in the U.S. market. (...) Vitamin D2 potency is less than one third that of vitamin D3. Physicians resorting to use of vitamin D2 should be aware of its markedly lower potency and shorter duration of action relative to vitamin D3." http://jcem.endojournals.org/cgi/content/abstract/89/11/5387

Pierre-Alain Gouanvic 09:38, 27 June 2008 (CDT)

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