October 20, 2014 — USA Today reports that GNC, one of the largest retailers of dietary supplements in the United States, has stopped selling Redline White Heat and OxyTHERM Pro just weeks after laboratory tests detected stimulant ingredients.
GNC would not say why they decided to pull the supplements.
Earlier this month, USA Today reported that AMP Citrate, a chemical cousin to DMAA, was found in twelve products that were tested by researchers from Harvard. They also reported that two members of Congress have asked the FDA to take effective action against companies that sell products containing DMBA.
The ingredient, also known as DMBA or 4-amino-2-methylpentane citrate, is marketed as a natural extract of a tea leaf.
However, researchers doubted that DMBA had any natural source because it would be physically impossible to extract enough of the ingredient from tea leaves to manufacture even the lowest doses. There is no evidence that it has ever been extracted from a plant.
DMAA, an amphetamine-like synthetic stimulant, was pulled off the market in 2012 after it was linked to 86 adverse events, including heart attack, stroke, seizure, and death.
Unlike pharmaceutical medications, the FDA does not require manufacturers of supplements to prove they are safe or effective for their intended purpose. However, the FDA does not allow marketing of supplements for the treatment of diseases. They also require a New Dietary Ingredient (NDI) notification when manufacturers introduce new ingredients.
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