L-citrulline powder consists of a nonessential amino acid that is produced naturally by the body. It is most commonly taken by bodybuilders and athletes to improve exercise endurance. L-citrulline powder is most well-known for supporting athletic endurance. It supports the cardiovascular system and heart health and may help fortify the immune system.* L-Citrulline may also contribute to sexual health and aid libido.** These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.