Metabolic Product of Arginine. Promotes Nitric Oxide. Aids in Pumps & Supports Recovery. Increase Muscle Fitness. Agmatine, a by-product of Arginine, is a more direct wat to improve nitric oxide synthesis, which has been shown to enhance muscle pumps and support recovery from intense workouts. Agmatine also helps regulate hormone release, and is beneficial for healthy neurotransmitter activity and insulin response.