Citrulline by Metabolic Nutrition is a non-essential amino acid which helps the body maintain healthy arteries and blood pressure. Citrulline also reduces fatigue and improves blood flow to increase endurance for both aerobic and anaerobic during prolonged exercise. Metabolic Nutrition provides a pharmaceutical grade, class-leading 5,000 mg of the purest form of Citrulline Malate, specifically developed for individuals who want to maximize their health and wellness.