Ingredient guide
L-arginine is an amino acid the body uses to make nitric oxide, which relaxes blood vessels. Meta-analyses show it can give a small, real reduction in blood pressure. The evidence quality is moderate but uneven.
Moderate evidenceL-arginine is an amino acid, one of the building blocks of protein. The body usually makes enough, so it is called semi-essential, meaning you may need more from food or supplements during illness or stress. Its starring role in supplements is as the raw material for a gas your body makes called nitric oxide.
Nitric oxide is a signal that tells the smooth muscle in blood vessel walls to relax. When vessels relax, they widen, blood flows more easily, and pressure can drop a little. By supplying more arginine, the idea is to give the body more material to make nitric oxide. This is the same pathway behind its use for circulation and exercise.
For blood pressure, the evidence is reasonably supportive. A meta-analysis of randomised, placebo-controlled trials found that L-arginine lowered systolic pressure by roughly 5 points and diastolic pressure by about 2 to 3 points. An umbrella review of several meta-analyses reached similar conclusions, especially in people with high blood pressure.
The caveats are real. The trials vary in dose and duration, heterogeneity is high, and the overall quality is rated low to moderate. There is also a safety signal worth respecting. A trial in people recovering from a heart attack was stopped early over concerns. We grade the evidence as moderate. L-arginine can modestly lower blood pressure, but it needs medical input for anyone with heart disease.
Blood pressure trials use several grams per day, usually split into doses, though the gut tolerates high amounts poorly. Some people use L-citrulline instead, since it raises arginine more reliably. Because of the heart-disease safety signal and the blood pressure effect, anyone with cardiovascular concerns or on blood pressure medicine should involve a healthcare provider before starting.
Blood pressure trials use a wide range, often several grams per day split into doses, sometimes up to 6 g or more. Because L-arginine is poorly absorbed, some people use L-citrulline instead to raise arginine levels. Ask your healthcare provider before starting, especially if you take blood pressure medicine or have had a heart attack.
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L-arginine is poorly absorbed. L-citrulline raises arginine levels more reliably, so some people prefer it for the same nitric oxide pathway.
Use caution. A trial in people recovering from a heart attack raised safety concerns, so anyone with heart disease should only use it with medical input.
At the high doses used in studies, arginine is poorly absorbed and can cause bloating and loose stools. Splitting the dose can help.