Arginine

Arginine or L-arginine is a complex, nitrogen-rich amino acid that is available as a natural supplement.

Purpose
Arginine is a precursor for nitric oxide (NO) and is catalyzed by nitric oxide synthase (NOS) enzyme. Arginine is also a precursor to agmatine and creatine, and a precursor in the urea cycle. This means arginine has a role in many different bodily systems including vasodilation, modulating the immune system, neurotransmission, ammonia detoxification, cell signaling and muscles.

Evidence
Arginine may help reduce fatigue, and may help prevent or treat heart or circulatory diseases.

Costs and availability
Available over the counter.

Learn more

 * Arginine - PubChem