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Sources, Functions, and Effects of Vitamins
Plasma tocopherol levels vary with total plasma lipid levels. Normally, the plasma alpha-tocopherol level is 5 to 20 mcg/mL (11.6 to 46.4 mcmol/L).
tardive dyskinesia is controversial. There is no convincing evidence that doses of up to 2000 units/day slow the progression of Alzheimer disease1).
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(See also Overview of Vitamins.)
Reference
1. Klein EA, Thompson IM Jr, Tangen CM, et alSeleniumJAMA 306(14):1549-56, 2011. doi: 10.1001/jama.2011.1437
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