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@hippy
"A number of countries have banned or heavily restricted the use of methylhexanamine as a dietary supplement, due to serious concerns about its safety. These countries include the U.S., Canada, New Zealand, Sweden, Australia, the United Kingdom, and Brazil."
" In August 2012, the U.K. Medicines and Healthcare products Regulatory Agency (MHRA) has ruled that the popular DMAA containing sports supplement Jack3D is an unlicensed medicinal product and that it and all other methylhexanamine containing products need to be removed from the UK market amid concerns of potential risks to public safety.[45]"
If the US military pulls a product you have to wonder about its safety vs. usefulness.