Vitamin E has many forms, and different forms have different physiological activities. In addition, the forms contained in food have their own specialties, so the total efficacy in food is expressed by α -tocopherol equivalent (α-TE), and other forms are converted into the amount of α -tocopherol with equivalent activity, because α -tocopherol has the highest activity in human body.

Vitamin E contains various forms of tocopherol, including α, β, γ, δ and tocotrienols.

Their activities are α-tocopherol >: β-tocopherol >; γ-tocopherol >; δ-tocopherol

In order to convert β-tocopherol, γ-tocopherol and tocotrienols into α-tocopherol, it is necessary to multiply them by the proportional coefficient of their activities.

The formula is activity: α-tocopherol: β-tocopherol: γ-tocopherol: triene tocopherol: δ-tocopherol =100: 50:10: 30:1.