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What side effects does L-arginine have?

L- arginine is an amino acid found in many foods and used as a dietary supplement. It is used to improve blood circulation, lower blood pressure and increase muscle mass. Although L- arginine is considered safe, some side effects can occur.

Gastrointestinal complaints

Some people taking L- arginine have reported gastrointestinal symptoms such as gas, diarrhea, nausea and vomiting. These side effects are usually mild and disappear when the supplement is stopped.


A common side effect of L- arginine is headaches. These headaches can range from mild to severe and can be relieved by taking painkillers.

Allergic reaction

Some people are allergic to L- arginine . Allergic reactions can cause itching, rash, difficulty breathing, swelling, and anaphylaxis. In case of an allergic reaction to L- arginine, a doctor should be consulted immediately.

blood pressure

L- arginine can lower blood pressure. If you suffer from low blood pressure, you should consult your doctor before taking L- arginine .


L- arginine may interact with certain medications. These include blood pressure medication, blood thinners, immunosuppressants and ACE inhibitors. If you are taking any of these medications, you should consult your doctor before taking L-arginine .

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