Arginine is a building block of protein and a known precursor to nitric oxide (NO), a molecule that supports blood flow and vascular health. It is classified as a semi-essential amino acid, meaning the body cannot produce it in sufficient quantities naturally. Found primarily in animal sources such as beef, poultry, fish, eggs, and dairy, arginine can also be obtained through supplements, which are especially popular among athletes. Supplementing with arginine may help meet the body’s increased demands, promoting muscle recovery, endurance, and overall performance.
