Geranium Extract (DMAA)
Mechanism of Action +
### Pharmacological Classification and Chemical Structure
1,3-dimethylamylamine (DMAA), also known by its IUPAC name 4-methylhexan-2-amine or methylhexanamine, is an aliphatic amine. Structurally, it shares similarities with amphetamines and endogenous catecholamines, though it lacks the aromatic benzene ring characteristic of classical amphetamines. Instead, it features a straight aliphatic chain with methyl group substitutions. This specific structural configuration allows DMAA to cross the blood-brain barrier effectively while exhibiting significant resistance to enzymatic degradation by monoamine oxidase (MAO). The steric hindrance provided by the methyl groups near the amine terminal prevents rapid breakdown, resulting in a prolonged pharmacological half-life compared to endogenous neurotransmitters.
### Mechanism of Action: Indirect Sympathomimetic Activity
DMAA functions primarily as an indirect-acting sympathomimetic agent. Unlike direct agonists that bind directly to adrenergic receptors, DMAA exerts its effects by modulating the release and reuptake of endogenous catecholamines, predominantly norepinephrine (noradrenaline) and, to a lesser extent, dopamine.
Upon ingestion and systemic circulation, DMAA enters presynaptic nerve terminals. It is hypothesized to interact with the trace amine-associated receptor 1 (TAAR1) and the norepinephrine transporter (NET). By entering the presynaptic neuron, DMAA disrupts the storage of norepinephrine in synaptic vesicles, forcing the neurotransmitter out into the cytosol. Subsequently, it induces reverse transport via the NET, flooding the synaptic cleft with norepinephrine. This massive release of catecholamines leads to widespread activation of both alpha- and beta-adrenergic receptors throughout the central and peripheral nervous systems.
### Cardiovascular Pharmacodynamics: Alpha and Beta Adrenergic Activation
The most profound and clinically significant effects of DMAA occur within the cardiovascular system, driven by the downstream activation of adrenergic receptors by the released norepinephrine.
1. **Alpha-1 Adrenergic Receptor Activation**: Norepinephrine binds to alpha-1 adrenergic receptors located on the smooth muscle cells of blood vessels. This binding activates a Gq-protein coupled cascade, stimulating phospholipase C (PLC) to cleave phosphatidylinositol 4,5-bisphosphate (PIP2) into inositol triphosphate (IP3) and diacylglycerol (DAG). IP3 triggers the release of calcium from the sarcoplasmic reticulum, leading to intense smooth muscle contraction and profound vasoconstriction. This mechanism is responsible for the severe spikes in systolic and diastolic blood pressure observed in DMAA users, which can precipitate hypertensive crises, strokes, and myocardial infarctions.
2. **Beta-1 Adrenergic Receptor Activation**: In the heart, norepinephrine binds to beta-1 adrenergic receptors, activating a Gs-protein coupled pathway. This increases intracellular cyclic AMP (cAMP) and activates protein kinase A (PKA), which phosphorylates calcium channels. The influx of calcium increases both the chronotropic (heart rate) and inotropic (contractility) states of the myocardium. The combination of increased cardiac output (via beta-1) against a severely constricted vascular network (via alpha-1) places immense mechanical strain on the cardiovascular system.
### Neurological and Psychological Pathways
In the central nervous system, the surge of norepinephrine and dopamine in the prefrontal cortex and limbic system results in heightened alertness, intense focus, and a temporary sense of euphoria or elevated mood. This mechanism is nearly identical to the pathways exploited by traditional ADHD medications and illicit amphetamines. However, the depletion of these neurotransmitter vesicles leads to a severe refractory period, commonly referred to as a 'crash,' characterized by lethargy, dysphoria, and acute fatigue once the exogenous compound is cleared from the system.
### The 'Natural Origin' Myth and Analytical Pharmacognosy
For years, dietary supplement manufacturers claimed that DMAA was a naturally occurring constituent of the geranium plant (*Pelargonium graveolens*) or its essential oils. This claim was used to bypass the FDA's New Dietary Ingredient (NDI) notification process under the Dietary Supplement Health and Education Act (DSHEA) of 1994.
However, rigorous analytical chemistry has definitively debunked this claim. In a landmark 2013 study conducted by the NSF International and the U.S. Army Research Institute of Environmental Medicine (USARIEM), researchers utilized advanced gas chromatography-mass spectrometry (GC-MS) and high-performance liquid chromatography (HPLC) to analyze authentic *Pelargonium* species. The research conclusively demonstrated that DMAA is not present in geranium plants or their essential oils. The DMAA found in dietary supplements, which ranged in concentration from 0.11% to 67.3%, was determined to be entirely of synthetic origin. The stereoisomeric ratios found in supplements matched those of synthetic laboratory production, not natural biosynthesis. Consequently, the FDA classifies DMAA as an unsafe food additive and an illegal synthetic drug when included in dietary supplements.
Does DMAA fail a drug test? +
What plant is DMAA from? +
Is it safe to take DMAA? +
Is DMHA legal in the US? +
Is DMAA safe to take with caffeine? +
Does geranium contain DMAA? +
How long does the effect of DMAA last? +
Does DMAA cause euphoria? +
Why did the FDA ban DMAA? +
What is the difference between 1,3-DMAA and 1,4-DMAA? +
Can DMAA cause a heart attack? +
What are the common side effects of DMAA? +
Is DMAA an amphetamine? +
What was DMAA originally used for? +
How do supplement companies hide DMAA on labels? +
Can DMAA help with weight loss? +
What should I do if I accidentally took DMAA? +
Why do bodybuilders use DMAA? +
Is DMAA a pre-workout? +
Does DMAA affect the liver? +
Everything About Geranium Extract (DMAA) Article
## Introduction to DMAA (Geranium Extract)
Few ingredients in the history of sports nutrition have generated as much controversy, popularity, and regulatory backlash as 1,3-dimethylamylamine, commonly known as DMAA. Often disguised on supplement labels under the benign-sounding name "Geranium Extract" or "Pelargonium graveolens extract," DMAA was the driving force behind the most intense pre-workout and weight loss supplements of the late 2000s and early 2010s.
However, the reality of DMAA is far removed from natural plant extracts. It is a powerful, synthetic amphetamine derivative that acts as a potent central nervous system stimulant. Due to a mounting toll of severe adverse health events—ranging from strokes and heart attacks to fatalities—DMAA has been universally condemned by health authorities, banned by the World Anti-Doping Agency (WADA), and declared an illegal substance in dietary supplements by the U.S. Food and Drug Administration (FDA).
## The History of DMAA: From Decongestant to Pre-Workout
DMAA was not discovered in a field of geraniums; it was synthesized in a laboratory. The compound was originally patented by the pharmaceutical company Eli Lilly in 1944 and marketed under the trademark name Forthane as an inhaled nasal decongestant. Like many early aliphatic amines, it was effective at constricting blood vessels in the nasal passages to relieve congestion. However, due to its systemic side effects and the development of safer alternatives, Forthane was voluntarily withdrawn from the market in the 1980s.
For decades, DMAA sat dormant in scientific literature until 2006, when it was reintroduced to the market by chemist Patrick Arnold. It was quickly adopted by the dietary supplement industry, most notably by USPLabs in their flagship products Jack3d (a pre-workout) and OxyElite Pro (a fat burner). These products became massive commercial successes, praised by bodybuilders and athletes for delivering unparalleled energy, focus, and appetite suppression.
## The "Geranium Extract" Myth
To legally sell DMAA as a dietary supplement in the United States, manufacturers had to classify it as a "dietary ingredient" under the Dietary Supplement Health and Education Act (DSHEA). To bypass the rigorous safety testing required for new synthetic drugs, companies claimed that DMAA was a naturally occurring compound found in the stems and oil of the rose geranium plant (*Pelargonium graveolens*).
This claim sparked intense scientific scrutiny. In 2013, a collaborative research effort between NSF International and the U.S. Army Research Institute of Environmental Medicine (USARIEM) put the geranium myth to rest. Using advanced gas chromatography-mass spectrometry, researchers analyzed authentic geranium plants and essential oils. The results were definitive: DMAA does not exist in nature. The DMAA found in commercial supplements was entirely synthetic. Consequently, the FDA ruled that DMAA is not a dietary ingredient, but rather an unsafe, unapproved food additive.
## How DMAA Works in the Body
DMAA is classified as an indirect-acting sympathomimetic. Its chemical structure allows it to cross the blood-brain barrier, where it triggers the massive release of norepinephrine (noradrenaline) and dopamine from presynaptic nerve terminals, while simultaneously preventing their reuptake.
This floods the nervous system with "fight or flight" neurotransmitters, resulting in: * **Intense Vasoconstriction:** Blood vessels narrow significantly, which spikes blood pressure. * **Tachycardia:** Heart rate accelerates rapidly. * **Bronchodilation:** Airways open up, increasing oxygen intake. * **Neurological Stimulation:** Users experience hyper-focus, euphoria, and an inability to feel fatigue.
Because DMAA is structurally resistant to the enzymes that normally break down neurotransmitters (like monoamine oxidase), its effects last much longer than natural adrenaline, often leading to a severe, exhausting "crash" once the body's neurotransmitter stores are depleted.
## Severe Safety Risks and Side Effects
The physiological mechanisms that made DMAA popular are the exact same mechanisms that make it incredibly dangerous. The FDA and WebMD classify DMAA as **LIKELY UNSAFE** for human consumption.
The profound vasoconstriction and cardiovascular strain caused by DMAA have been linked to severe, life-threatening side effects, especially when combined with other stimulants like caffeine. Documented adverse events include: * **Cardiovascular:** Shortness of breath, tightening in the chest, arrhythmias, myocardial infarction (heart attack), and cardiac arrest. * **Neurological:** Seizures, cerebral hemorrhage (stroke), and psychological conditions. * **Metabolic:** Lactic acidosis and acute liver injury.
By 2013, products containing DMAA had been linked to at least 86 reported health problems and five deaths, including the highly publicized deaths of multiple U.S. military personnel who suffered cardiac events during physical training after consuming DMAA-based supplements.
## Regulatory Status and FDA Action
The FDA's stance on DMAA is unequivocal: it is illegal.
Starting in 2012, the FDA issued a wave of warning letters to companies manufacturing DMAA products. When some companies, such as USPLabs, initially refused to comply, the FDA escalated its actions. In 2013, the FDA administratively detained millions of dollars worth of OxyElite Pro and Jack3d, forcing their destruction. The FDA also seized products from Hi-Tech Pharmaceuticals, leading to a protracted legal battle that culminated in a 2019 federal appeals court ruling affirming that DMAA is not a dietary ingredient and is not generally recognized as safe (GRAS).
Furthermore, DMAA was added to the World Anti-Doping Agency (WADA) prohibited substances list in 2010, resulting in numerous athletes facing suspensions and stripped titles after testing positive for the stimulant.
## Conclusion
While the era of DMAA pre-workouts is often viewed with nostalgia by some in the bodybuilding community, the scientific and medical consensus is clear. DMAA is a dangerous, synthetic amphetamine derivative masquerading as a natural plant extract. Its severe cardiovascular risks far outweigh any temporary benefits in energy or focus. Consumers should remain vigilant, read labels carefully to avoid aliases like "methylhexanamine" or "geranium extract," and strictly avoid any product containing this banned substance.