Alfa-tocopherol synthetic (Tocopherol, Alpha-tocopherol synthetic, vitamin E, E307) waa antioxidant ka ilaaliya unugyada waxyeellada iyadoo hoos u dhigaysa oksaydhka dufanka (dufanka) iyo samayska xag-jirayaasha xorta ah.
Alfa-tocopherol waxaa dhaqan ahaan loo aqoonsan yahay inay tahay antioxidant-ka ugu weyn ee nafleyda ku jira. Cabbiraadda waxqabadka fitamiin E ee unugyada caalamiga ah (IU) waxay ku saleysneyd kororka bacriminta iyada oo ay ugu wacan tahay ka hortagga cilladaha aan caadiga ahayn ee jiirka uurka leh marka la qaadanayo alfa-tocopherol. Wuxuu si dabiici ah ugu kordhaa qiyaastii 150% caadada ka jirta jirka hooyada xilliga uurka haweenka.
1 IU ee fiitamiin E waxaa lagu qeexaa inuu yahay bayoolaji u dhigma 0.667 milligram oo ah RRR-alpha-tocopherol (horey loogu yeeri jiray d-alpha-tocopherol ama 1 milligram oo dhan-rac-alpha-tocopheryl acetate (ganacsi ahaan loogu magac daray dl-alpha-tocopheryl acetate, asalka d, l-synthetic molecular compound, oo si haboon loogu magac daray 2-ambo-alpha-tocopherol, dib dambe looma soo saarin).