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Old 03-07-2010, 08:48 PM   #19
DancingWithElves
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Default Re: Vitamin D FAQ :)

Crystal, sadly I am 99% sure that it is ergocalciferol.

american journal of clinical nutrition:
Quote:
The case against ergocalciferol (vitamin D2) as a vitamin supplement1,2

Lisa A Houghton and Reinhold Vieth 1 From the School of Nutrition and Dietetics, Acadia University, Wolfville, Canada (LAH); the Department of Nutritional Sciences, University of Toronto, Toronto, Canada (RV); and the Mount Sinai Hospital, Toronto, Canada (RV)

Supplemental vitamin D is available in 2 distinct forms: ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3). Pharmacopoeias have officially regarded these 2 forms as equivalent and interchangeable, yet this presumption of equivalence is based on studies of rickets prevention in infants conducted 70 y ago. The emergence of 25-hydroxyvitamin D as a measure of vitamin D status provides an objective, quantitative measure of the biological response to vitamin D administration. As a result, vitamin D3 has proven to be the more potent form of vitamin D in all primate species, including humans. Despite an emerging body of evidence suggesting several plausible explanations for the greater bioefficacy of vitamin D3, the form of vitamin D used in major preparations of prescriptions in North America is vitamin D2. The case that vitamin D2 should no longer be considered equivalent to vitamin D3 is based on differences in their efficacy at raising serum 25-hydroxyvitamin D, diminished binding of vitamin D2 metabolites to vitamin D binding protein in plasma, and a nonphysiologic metabolism and shorter shelf life of vitamin D2. Vitamin D2, or ergocalciferol, should not be regarded as a nutrient suitable for supplementation or fortification.
i found a few other studies showing that d2 works for shorter periods of time, is at least 2 if not 3 times less potent, has failed to prevent fractures as compared with d3, etc. etc.
no solid medical info on petrification though.

---------- Post added at 09:48 PM ---------- Previous post was at 09:46 PM ----------

h ttp://www.pharmer.org/images/domestic/ergocalciferol-vitamin-d2-pa-140

broken with two spaces after 'h', is this your little green pill?
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