L-Citrulline is a non-essential amino acid that is produced naturally in the body. It plays a key role in the urea cycle, helping to remove ammonia from the bloodstream. L-Citrulline is also found in certain foods, such as watermelon, and is often used as a dietary supplement to support athletic performance and recovery. In the body, L-Citrulline is converted into another amino acid called L-arginine, which is important for the production of nitric oxide. Nitric oxide helps to relax blood vessels, improving blood flow and circulation. This makes L-Citrulline popular among athletes and fitness enthusiasts for its potential benefits in enhancing endurance and reducing muscle soreness.