40+ Fitness Editor Mike talks about the FDA Warning (April 2012) of the ingredient DMAA which is included in a host of very popular pre-workout supplements like Jacked 3D, OxyPro Elite, 1MR (old version), and many others. According to the FDA, DMAA, also known as 1,3-dimethylamylamine, methylhexanamine, or geranium extract, is an ingredient used in so-called “workout boosters” that is often touted as a “natural” stimulant. DMAA is known to narrow the blood vessels and arteries, which can elevate blood pressure and may lead to cardiovascular events ranging from shortness of breath and tightening in the chest to heart attack, the agency said. According to the FDA, it has received 42 adverse event reports on products containing DMAA. Some of the reports involved cardiac disorders, nervous system disorders, psychiatric disorders and death.