Editing Tocopherol (section)

===α-Tocopherol equivalents===
For dietary purposes, vitamin E activity of vitamin E [[isomers]] is expressed as α-tocopherol equivalents (a-TEs). One a-TE is defined by the biological activity of 1&nbsp;mg (natural) d-α-tocopherol in the resorption-gestation test. According to listings by [[FAO]] and others β-tocopherol should be multiplied by 0.5, γ-tocopherol by 0.1, and α-tocotrienol by 0.3.<ref name=fao1 /> The IU is converted to aTE by multiplying it with 0.67.<ref>{{cite web |url=http://www.ncc.umn.edu/products/databaseNUTvitamins.html |title=Vitamins |access-date=2013-03-26 |url-status=dead |archive-url=https://web.archive.org/web/20130320015716/http://www.ncc.umn.edu/products/databaseNUTvitamins.html |archive-date=2013-03-20 |publisher=University of Minnesota Nutrition Coordinating Center on Vitamins}}</ref> These factors do not correlate with the antioxidant activity of vitamin&nbsp;E isomers, where [[tocotrienols]] show even much higher activity in vivo.<ref name="pmid11160563">{{cite journal | vauthors = Packer L, Weber SU, Rimbach G | title = Molecular aspects of alpha-tocotrienol antioxidant action and cell signalling | journal = The Journal of Nutrition | volume = 131 | issue = 2 | pages = 369S–373S | date = February 2001 | pmid = 11160563 | doi = 10.1093/jn/131.2.369S | doi-access = free }}</ref>