Science-Based Nutrition KQ - Kyowa Quality Helps Improve Circulation and Muscle Maintenance Vegan Dietary Supplement Non-GMO Gluten Free Soy Free L-Citrulline is an amino acid that plays an important role in nitric oxide metabolism and regulation. In the body, L-Citrulline is converted to L-Arginine to support L-Arginine and nitric oxide levels. Increased production of nitric oxide promotes vascular dilation which improves oxygen and blood circulation throughout the body. Research has shown that L-Citrulline raises plasma L-Arginine, thereby allowing higher protein synthesis and protein content in muscle during exercise. Helps support nitric oxide metabolism Helps support muscle protein synthesis and relive muscle fatigue Helps support vascular health No added or artificial flavors, colors, or preservatives