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    There are eight natural, fat-soluble vitamin E forms, which are divided into four tocopherols and four tocotrienols. The four tocopherols are divided into alpha (α), beta (β), gamma (γ) and delta (δ) tocopherol with α-tocopherol being the most potent. All vitamins E are antioxidants.

    In dietary supplements, α-tocopherol can be added both as an active vitamin or in small amounts as an excipient to counteract oxidation of the preparations.

    α-Tocopherol has E-number 307.