L-arginine releases nitric oxide in the blood. Nitric oxide acts to widen blood vessels in the bloodstream, which may help aid certain circulatory conditions. A person’s body naturally produces L-arginine under normal circumstances. People also get additional L-arginine as part of their regular diet. L-arginine has two effects: it turns into nitric oxide and helps the body build protein. These effects give L-arginine an array of potential benefits that range from heart health and chest pain to helping to build muscles, repair wounds, and improve male fertility. • Growth hormone reserve test • Reducing high blood pressure • Correcting inborn errors of urea synthesis • Treating heart disease • Treating erectile dysfunction (ED) • Easing inflammation of the digestive tract in premature infants • Controlling blood sugar in people with diabetes Additionally, L-arginine may have the potential to help with many other issues.