While the most studied form of vitamin E is alpha tocopherol, the most abundant form found in your body, this research used gamma tocopherol, which is the most commonly occurring natural form of vitamin E in the US diet, found in foods such as walnuts and pecans. (articles.mercola.com)
A good vitamin E supplement will contain mixed tocopherols with a substantial amount of gamma tocopherol. (adrenalfatiguesolution.com)
Because of its different chemical structure, gamma tocopherol scavenges reactive nitrogen species, which can damage proteins, lipids, and DNA. (articles.mercola.com)