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Doctor's Best, L-Citrulline Powder, 7 oz (200 g) Herbs making it gentle on theScience Based Nutrition KQ Kyowa Quality Helps Improve Circulation and Muscle Maintenance Dietary Supplement Vegan 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