: Heart attack, cardiac arrest, arrhythmias, and shortness of breath.

In the United States, . Since 2013, the Food and Drug Administration (FDA) has classified DMAA as an unapproved, unsafe food additive and has worked aggressively to remove it from the market due to significant cardiovascular risks. The Legality of DMAA in the USA

The FDA warns that DMAA is a potent vasoconstrictor that can dangerously elevate blood pressure. Reported adverse effects include: