L-arginine is classified as a conditionally essential amino acid. It is essential for infants due to their inability to synthesise L-arginine. L-arginine becomes conditional in adulthood.
L-arginine is converted in the body into a chemical called nitric oxide. Nitric oxide causes blood vessels to open wider for improved circulation, blood flow, and relaxes blood vessels.
L-arginine is found in red meat, poultry, fish, and dairy products. It can also be used in dietary supplements.