L-Arginine refers to the amino acid having numerous functions and this helps the body in getting rid of ammonia. This is useful in making compounds such as creatine, L-proline and L-glutamate. This is easily converted into glycogen and glucose, if required. L-arginine is useful in making nitric oxide. L-arginine helps in improving the relaxed blood vessels such as erectile dysfunction and atherosclerosis. L-arginine is effective in protein formation as well and this stimulates the hormones growth and prolactin. L-arginine is useful in making nitric oxide that decreases the stiffness in the blood vessels and enhances the blood flow thereby improving the blood vessel functions. L-arginine is strictly prevented from using after a heart attack. L-arginine is useful for erectile dysfunction that relaxes the muscles that is enveloping the blood vessels supporting the penis. The blood vessels dilate in the penis and increase the flow of blood and helps in maintaining the erection. L-arginine repairs wound. However, L-arginine is produced in the liver and kidney and the food sources are dairy products, nuts, poultry, fish and meat.