L-arginine is an amino acid naturally found in red meat, poultry, fish, and dairy. It’s 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.

The benefits of L-arginine include:

  • Chest pain (angina)
  • High blood pressure
  • Narrowing of blood vessels that causes poor blood flow to the limbs