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Vitamin E is a group of eight fat soluble compounds that include four tocopherols and four tocotrienols. Vitamin E deficiency, which is rare and usually due to an underlying problem with digesting dietary fat rather than from a diet low in vitamin E, can cause nerve problems. Vitamin E is a fat-soluble antioxidant protecting cell membranes from reactive oxygen species.
alpha-tocopherol Of the many different forms of vitamin E, gamma-tocopherol (γ-tocopherol) is the most common form found in the North American diet, but alpha-tocopherol (α-tocopherol) is the most biologically active.
Vitamin E is not a single compound but the name refers to a group of fat soluble compound. It includes four different TOCOPHEROLS. So another name of it is tocopherols.