ConsumerLab.com
This article was originally published in The Tan Sheet
Executive Summary
Dosing, adverse reaction difference between synthetic (dl-alpha tocopherol) and natural (d-alpha tocopherol) vitamin E stressed in ConsumerLab.com report March 13. Higher doses of synthetic vitamin E are needed to achieve therapeutic effects although synthetic vitamin E is more apt to cause potential bleeding problems, independent lab notes. Of the 19 natural and nine synthetic supplements tested, ConsumerLab reported "one synthetic product had no more than 71% of its claimed amount of vitamin E," "one 'natural' product had no more than 85% of the claimed amount" and a third was identified as natural although it contained synthetic vitamin E
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