L-arginine is an amino acid, which is one of the building blocks of proteins. It is considered semi-essential, meaning that it can be synthesized in the body but can also be obtained from dietary sources.
Foods high in L-arginine include red meat, poultry, fish, and dairy products.
The body uses L-arginine for a variety of purposes, including the synthesis of proteins, the production of nitric oxide, and the regulation of hormones.