L-Citrulline is an amino acid that is found in foods such as watermelon, cucumbers, and some types of fish and meat. It is also available as a dietary supplement. L-Citrulline is converted to L-arginine in the body, which then converts to nitric oxide. Nitric oxide helps to dilate blood vessels, which can improve blood flow and lower blood pressure. L-Citrulline supplementation has also been found to improve exercise performance and reduce muscle soreness after exercise. Additionally, L-Citrulline may also help with erectile dysfunction. However, more research is needed to fully understand the potential benefits of L-Citrulline.