Vitamin E supplements are classified as:
- Fully synthetic vitamin E, "d, l-alpha-tocopherol", the most inexpensive, most commonly sold supplement form usually as the acetate ester;
- Semi-synthetic "natural source" vitamin E esters, the "natural source" forms used in tablets and multiple vitamins; highly fractionated natural d-alpha tocopherol
- Less fractionated "natural mixed tocopherols" and high gamma-tocopherol fraction supplements
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