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Robert Tisserand replies about Vitamin-E added to slow the oxidization of essential oils:

“There are four principal isomers (chemical subtypes) of tocopherol:

alpha
beta
gamma
delta

There are also sub-types of each one.

You can use ‘mixed’ tocopherols: all four in various proportions. But my preference for essential oils is to use alpha-tocopherol, specifically d-alpha tocopherol…

the tocopherol should be added at 0.1% by weight of the total product. Putting more in won’t be more effective.

Although ‘tocopherol’ and ‘vitamin E’ are often used synonymously, vitamin E is actually even broader, because the term encompasses both tocopherols and tocotrienols.”

via Vitamin E Types Best – Slow Oxidation of Essential Oils – Tocopherol.

via Vitamin E Types Best – Slow Oxidation of Essential Oils – Tocopherol.

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