DMAA (1,3-dimethylamylamine) is a synthetic stimulant that acts on the brain in ways similar to amphetamine. Also sold under names like methylhexanamine and geranamine, it was widely used in pre-workout supplements and fat burners until the FDA declared it illegal in dietary supplements starting in 2012. Despite the ban, DMAA still shows up in products sold online and in supplement shops, which is why understanding what it actually does to your body matters.
How DMAA Works in the Body
DMAA’s stimulant effects come from its interaction with two key brain chemicals: dopamine and norepinephrine. Research published in The Journal of Pharmacology and Experimental Therapeutics found that DMAA binds to the dopamine transporter in a competitive manner, blocking the normal reuptake of dopamine and keeping levels elevated. It behaves like a substrate at this transporter, meaning it doesn’t just block it but actually triggers changes in how the transporter functions, similar to what amphetamine does.
DMAA has an even stronger effect on the norepinephrine system, the chemical pathway responsible for your “fight or flight” response. This is what produces the surge of energy, focus, and elevated heart rate that users feel. Because DMAA has a stronger preference for the norepinephrine system compared to amphetamine, it carries a greater risk of dangerously raising blood pressure. The flip side is that its weaker dopamine activity may mean less addictive potential than amphetamine, though that doesn’t make it safe.
Why People Used It
DMAA became popular in the late 2000s and early 2010s as an ingredient in pre-workout powders and weight loss pills. Users reported intense energy, heightened focus, and a feeling of euphoria during workouts. Some products contained DMAA alongside high doses of caffeine, a combination that amplified the stimulant effects but also compounded the cardiovascular risks. At its peak, DMAA appeared in dozens of mainstream supplement brands sold in major retailers.
The Geranium Plant Controversy
Supplement companies marketed DMAA as a “natural” ingredient derived from geranium plants (Pelargonium graveolens), which gave it a veneer of safety. The reality is more complicated. A Chinese study first reported finding DMAA in geranium oil at a concentration of 0.66%, and later research did detect trace amounts in certain Chinese geranium species, at levels between 13 and 365 nanograms per gram of plant tissue.
However, these are extraordinarily small quantities. The amounts found in supplements were far higher than anything a geranium plant could realistically supply, and studies analyzing commercially available geranium oils and extracts generally failed to find DMAA at all. The scientific consensus leans toward DMAA in supplements being synthetically produced, with the geranium claim serving primarily as a marketing tool to sidestep regulation.
Documented Health Risks
DMAA’s risks are not theoretical. Multiple case reports document serious, life-threatening events. In one case, a 21-year-old man took two tablets containing a total of 556 mg of DMAA along with 150 mg of caffeine after drinking one beer. Within 30 minutes he developed a severe headache, and doctors determined he had suffered a cerebral hemorrhage (bleeding in the brain).
A separate report described three patients who experienced cerebral hemorrhages after consuming DMAA. One had taken just 132 mg of DMAA with 168 mg of caffeine after drinking alcohol. Another consumed roughly 50 mg mixed into a drink at a bar. The combination of DMAA with caffeine and alcohol appears particularly dangerous, but the hemorrhages occurred across a wide range of doses, making it difficult to identify a “safe” amount.
European researchers who reviewed the medical literature on DMAA and related compounds cautioned that any oral dose above 4 milligrams should be regulated as a drug. Most supplement products contained doses ranging from 25 mg to over 75 mg per serving, well above that threshold.
Legal Status Around the World
The FDA’s position is unambiguous: DMAA is not a dietary ingredient, and any product marketed as a dietary supplement containing DMAA is illegal in the United States. The agency began issuing warning letters to manufacturers in 2012 and has since seized products. In 2019, a U.S. Court of Appeals affirmed that DMAA is not generally recognized as safe, upholding the seizure and forfeiture of DMAA-containing products.
Australia has also banned the sale, supply, and use of products containing DMAA, citing the dangers to human health. The country’s Therapeutic Goods Administration has fined companies for selling supplements containing the substance. In competitive sports, the World Anti-Doping Agency (WADA) lists DMAA as a prohibited specified stimulant under its S6.B category, banned during competition. It appears on the prohibited list under several of its chemical names, including 4-methylhexan-2-amine and methylhexaneamine.
How to Spot DMAA in Products
Despite bans, DMAA continues to appear in supplements sold through online retailers and specialty stores. It rarely appears on labels as “DMAA.” Instead, look for any of its alternative names: 1,3-dimethylamylamine, methylhexanamine, methylhexaneamine, geranamine, geranium extract, geranium oil, or 4-methylhexan-2-amine. Some products use a close relative called 1,4-DMAA (also known as 1,4-dimethylpentylamine), which carries similar risks and is also banned.
If a pre-workout or fat burner promises extreme energy and lists a “proprietary blend” without clearly identifying every ingredient, that’s a reason for caution. Third-party testing organizations like NSF Certified for Sport or Informed Sport can help you verify that a supplement is free of banned stimulants.