The U.S. Food and Drug Administration (FDA) has advised 14 dietary supplement companies in warning letters dated April 24, 2015, that their total of 17 products include an ingredient on the Supplement Facts panel which is not approved for such use under federal law because it is likely synthetic and cannot reasonably be expected to be safe. According to the warning letters, the ingredient in question is 4-Amino-2-Methylpentane Citrate, and also known as 1,3-Dimethylbutylamine, 2-amino-4-methylpentane, AMP citrate, and 4-methyl-2-pentanamine, or DMBA. FDA WarningThese warning letters went to: 1ViZN LLC, Lehi, UT; Beta Labs, Newark, DE; Blackstone Labs LLC,
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