Asymmetric Dimethylarginine
Also known as: ADMA
What Does Asymmetric Dimethylarginine Measure?
Asymmetric Dimethylarginine (ADMA) is a naturally occurring amino acid derivative found in the bloodstream that serves as a potent inhibitor of nitric oxide synthase (NOS), the enzyme responsible for producing nitric oxide (NO) in the body. Blood levels of ADMA reflect the balance between its production through protein methylation and its breakdown by the enzyme dimethylarginine dimethylaminohydrolase (DDAH). Higher circulating ADMA concentrations indicate reduced capacity for nitric oxide production, which directly impairs the ability of blood vessels to relax and dilate properly.
Why Does Asymmetric Dimethylarginine Matter?
ADMA is considered an emerging cardiovascular risk biomarker because elevated levels are strongly associated with endothelial dysfunction — the earliest detectable stage of atherosclerosis and cardiovascular disease. When ADMA levels are high, nitric oxide production is suppressed, leading to increased vascular resistance, higher blood pressure, inflammation, oxidative stress, and accelerated plaque formation. Elevated ADMA has been independently linked to increased risk of heart attack, stroke, peripheral artery disease, chronic kidney disease, diabetes complications, and overall cardiovascular mortality. It provides clinicians with a window into vascular health that traditional lipid panels may not fully capture.
Normal Ranges
Males
0.40 – 0.75 µmol/L
Females
0.40 – 0.75 µmol/L
Children
Varies by age; generally lower than adult values, typically 0.30 – 0.60 µmol/L
Causes of High Levels
- Chronic kidney disease or renal failure, which impairs ADMA clearance and dramatically elevates circulating levels
- Cardiovascular disease and atherosclerosis, where oxidative stress upregulates ADMA production and reduces DDAH activity
- Type 2 diabetes and insulin resistance, which decrease DDAH enzyme activity and increase ADMA accumulation
- Hypertension, where endothelial stress promotes methylated protein turnover and raises ADMA production
- Oxidative stress and chronic inflammation from conditions such as metabolic syndrome, obesity, or autoimmune disorders
- Hyperhomocysteinemia, as elevated homocysteine impairs DDAH function and raises ADMA concentrations
Causes of Low Levels
- Regular aerobic exercise, which upregulates DDAH activity and enhances ADMA breakdown
- High dietary L-arginine intake, which competitively counters ADMA's inhibitory effects on nitric oxide synthase
How to Improve Your Asymmetric Dimethylarginine
Diet
- Increase L-arginine-rich foods such as turkey, chicken, pumpkin seeds, lentils, and chickpeas to competitively offset ADMA's inhibitory effect on nitric oxide production
- Consume nitrate-rich vegetables like beets, spinach, arugula, and celery to support alternative nitric oxide synthesis pathways independently of ADMA
- Follow a Mediterranean-style diet high in olive oil, fish, nuts, fruits, and vegetables to reduce systemic oxidative stress that drives ADMA production
- Limit processed foods, refined sugars, and trans fats, which promote insulin resistance and oxidative stress — key drivers of elevated ADMA
- Increase dietary antioxidants through berries, dark leafy greens, and green tea to protect DDAH enzyme activity from oxidative inactivation
Supplements
- L-arginine: 3–6 g per day may help competitively restore nitric oxide synthase activity despite elevated ADMA (use cautiously in those with herpes simplex or cardiovascular events)
- L-citrulline: 3–6 g per day is often preferred over L-arginine as it more effectively raises plasma arginine levels and supports nitric oxide production
- Folic acid: 400–800 mcg per day may reduce ADMA by lowering homocysteine and restoring DDAH activity
Related Biomarkers
Frequently Asked Questions
What does it mean if my ADMA levels are elevated?
Elevated ADMA means your body has higher-than-normal levels of a molecule that blocks nitric oxide production. This reduces your blood vessels' ability to relax and dilate, which is an early sign of endothelial dysfunction — the first step in the development of atherosclerosis and cardiovascular disease. High ADMA is also associated with increased blood pressure, kidney disease, diabetes complications, and overall cardiovascular risk. It does not diagnose a specific disease on its own but signals that vascular health needs attention.
Is ADMA testing available as a routine blood test?
ADMA testing is not yet part of standard routine blood panels at most clinics. It is typically measured using specialized laboratory methods such as high-performance liquid chromatography (HPLC) or enzyme-linked immunosorbent assay (ELISA). It is more commonly ordered by cardiologists, nephrologists, or functional/integrative medicine practitioners when assessing cardiovascular or kidney disease risk beyond conventional markers. Availability varies by country and healthcare setting.
Can lifestyle changes really lower ADMA levels?
Yes, several well-studied lifestyle interventions can significantly reduce ADMA levels. Regular aerobic exercise is one of the most effective strategies, as it increases the activity of DDAH, the enzyme that breaks down ADMA. A diet rich in antioxidants, nitrate-containing vegetables, and L-arginine or L-citrulline can help restore nitric oxide balance. Quitting smoking, losing excess weight, and controlling blood sugar also meaningfully lower ADMA by reducing the oxidative stress that drives its accumulation.