The US Food and Drug Administration (FDA) has issued another warning letter for DMAA (1,3-Dimethylamylamine, also known as methyl hexaneamine (MHA), and several other names). DMAA has received much press in recent months with the FDA issuing warning letters to 10 manufacturers and distributors of supplements containing DMAA. Manufacturers of some sports supplements are claiming that DMAA is a natural substance derived from geraniums but researchers are showing that it is synthetic, consisting of four stereoisomers. There has been intense debate in the dietary supplement industry and the analytical testing industry about whether DMAA is in fact a constituent of geranium.
