L-Arginine is a natural, simple amino acid that is popular among bodybuilders to promote blood flowing to the muscles for a better workout. Easily digestible, this versatile amino acid works as a precursor in the synthesis of glutamate, polyamines, agmatine, proline, creatinine, and urea.
L-arginine is an amino acid naturally found in red meat, poultry, fish, and dairy. It is necessary for making proteins and is commonly used for circulation.
L-arginine is converted in the body into a chemical called nitric oxide. Nitric oxide causes blood vessels to open wider for improved blood flow. L-arginine also stimulates the release of growth hormone, insulin, and other substances in the body. It can be made in a lab and used in supplements.
People use L-arginine for chest pain and various blow flow issues, erectile dysfunction, high blood pressure during pregnancy, and a serious disease in premature infants called necrotizing enterocolitis (NEC). - WebMD.com