Tocotrienols – together with tocopherols – compose the vitamin E family. Natural tocotrienols exist in four ifferent forms or isomers, named alpha-, beta-, gamma- and delta- tocotrienol, which contain different number of methyl groups on the chromanol ring. Although all the isomers are important antioxidants due to the ease of donating a hydrogen atom from the hydroxyl group on the chromanol ring to reduce free radicals, each of them has its own biological activity. Furthermore, many studies on test-tube scale indicate that tocotrienols have an anti-cancer effect, especially against skin and breast cancer for the extra three unsaturated bond.