what is arginine supplement
Print. Arginine is an amino acid (a building block of protein), produced in the body and found in many foodsâespecially those rich in protein, such as dairy products, meats, fish, nuts and soybeans.Most of the time, we produce or consume all the arginine we need. Some preliminary studies have found that arginine supplements can improve the function of blood vessels, enhance coronary blood flow, lower blood pressure and even reduce angina and other symptoms in people with heart and/or vascular disease.