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|Natural-source Vitamin E is produced from a by-product of edible vegetable oil. While synthetic Vitamin E is made in a laboratory and produced from petrochemicals, and turpentine. It costs far less to produce than the natural-source Vitamin E.
So, how do you tell the difference? If the label says d (example: d-alpha tocopherol) that is natural. If it says dl (example dl-alpha tocopherol) that is synthetic.