Big Ramy Labs™ Red Rex Arginine 5000 mgBig Ramy Labs Red Rex Arginine 5000 mg delivers a high strength dose of pure L Arginine designed for athletes who want to support their training intensity and overall performance routine. Known as a key amino acid involved in many physiological processes, L Arginine is commonly used by athletes during their pre workout regimen. 5000 mg of premium L Arginine per serving Designed for athletes and high intensity training routines Pure and concentrated