* New! * DI-Arginine Malate - 1,600 mg * L-Ornithine - 500 mg * L-Lysine - 500 mg * Dietary Supplement Discussion: The Pro Muscle Nitric formula is an innovative blend of ingredients intended to provide nutritive support for the body. Supplement Training Systems is an innovative Sports Supplement Brand that is clean and healthy, not over engineered and designed for all lifestyles.