You might have heard about some controversy surrounding dietary supplements that contain the compound 1,3-dimethylamylamine (DMAA): such as USP Labs ‘Jack3d’ or Nutrex Research ‘HemoRage Black’. A Warning Letter written by the FDA has been sent to 10 major companies in the supplement industry, including Gaspari Nutrition, USP Labs and Muscle Warfare Inc. The FDA said in the letter that the companies had …
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