Note. Vitamin E is the generic term for all tocopherols and tocotrienols having qualitatively the biological activity of RRRalpha-tocopherol (previously known as d-alpha-tocopherol). Alpha-tocopherol has the highest biological activity. Other major forms include beta-and gamma-tocopherol and alphatocotrienol. All-rac-alpha-tocopherol (previously known as dlalpha-tocopherol) is the synthetic form of vitamin E. Vitamin E activity in clinical trials has often been expressed as IU (International Units). One IU = 1 mg all-rac-alpha-tocopherol acetate = 0.74 mg RRR-alpha-tocopheryl acetate = 0.67 mg .
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