KYOWA’s ultra-pure, science-backed L-Citrulline has been shown to support Nitric Oxide metabolism and protein synthesis. L-Citrulline is converted to L-Arginine in the body to support L-Arginine and nitric oxide (NO) levels. Increased production of NO supports vascular dilation and blood circulation throughout the body. L-Citrulline is also expected to relieve muscle fatigue through ammonia elimination. The only U.S.-made GRAS L-Citrulline, we invite you to learn more about this ingredients sports performance and heart health benefits.