Pharm Grade Arginine Pump Max is involved in a number of different functions in the body. Which include Wound healing, Helping the kidneys remove waste products from the body, Maintaining immune and hormone function, Dilates and relaxes the arteries. L-Citrulline boosts nitric oxide production in the body. Nitric oxide helps your arteries relax and work better, which improves blood flow throughout your body. This may be helpful for treating or preventing many diseases. L-citrulline supplements may ease symptoms of mild-to-moderate erectile dysfunction (ED).