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Traber, Maret G.; Head, Brian
Free radical biology & medicine, December 2021, 2021-12-00, Volume: 177Journal Article
α-Tocopherol (α-T) is a required dietary nutrient for humans and thus is a vitamin. This narrative review focuses on vitamin E structures, functions, biological determinants and its deficiency symptoms in humans. The mechanisms for the preferential α-T tissue enrichment in the human body include the α-T transfer protein (TTPA) and the preferential metabolism of non-α-T forms. Potential new α-T biomarkers, pharmacokinetic data, and whether there are better approaches to evaluate and set the α-T dietary requirement are discussed. Finally, the possible role of α-T supplements in delay of chronic diseases and the evaluation of vitamin E safety are considered. Display omitted •α-Tocopherol (α-T) is a required dietary nutrient for humans.•α-T deficiency in humans manifests as a progressive, peripheral neuropathy.•α-T is trafficked by the α-T transfer protein (TTPA).•The preference for α-T is maintained by the hepatic TTPA and catabolism of non-α-T.•α-CEHC, a product of catabolism, may be the best biomarker for VitE status.
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