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Harvard researchers have recently found an untested, unapproved stimulant lurking in numerous herbal weight-loss and workout supplements sold across the nation.

Scientists from the Harvard Medical School have called on the FDA this week to alert the public about a substance showing up in certain categories of dietary supplements. Known as beta-methylphenylethylamine (BMPEA) this organic compound is a positional isomer of the class of drugs known as amphetamines. It was first isolated in the 1930’s, but its safety in humans has never been studied.