Nitric Oxide Pre•Sport – is designed to help you maximize performance when you work out or participate in any sporting activity.* When it comes to performance, Nitric Oxide is key. Nitric Oxide is a naturally-occurring compound in the body that plays a key role in cardiovascular health.* Nitric Oxide is produced in the inner lining of blood vessels and helps to relax and dilate vessels, allowing more blood to flow throughout the body. This unique formula features L-Citrulline, an amino acid that is readily converted to L-Arginine, which can then be converted into Nitric Oxide within the body.