Delta-tocopherol roba (E309) wani maganin antioxidant ne wanda ke kare sel daga lalacewa ta hanyar rage iskar oxygenation na lipids (fats) da samuwar radicals kyauta.
E309 (synthetic delta-tocopherol) an haɗa shi a cikin jerin abubuwan ƙari na abinci da ba su da izini don amfani a masana'antar abinci a cikin ƙasarmu.