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Am J Clin Nutr. 2006 Oct;84(4):694-7. doi: 10.1093/ajcn/84.4.694.
The case against ergocalciferol (vitamin D2) as a vitamin supplement.
Houghton LA, Vieth R
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Am J Clin Nutr. 2006 Oct;84(4):694-7. doi: 10.1093/ajcn/84.4.694.
Houghton LA, Vieth R