From Multivitamin Wiki
Vitamin E refers to a group of eight fat-soluble compounds that include both tocopherols and tocotrienols.
Vitamin E has several important functions including:
- protecting cell membranes 
- ↑ Brigelius-Flohe, B; Traber (1999). "Vitamin E: function and metabolism". FASEB 13: 1145–1155.
- ↑ http://www.nhs.uk/Conditions/vitamins-minerals/Pages/Vitamin-E.aspx