Nitric oxide, also known as NO or NO2, is the body's primary vasodilator, relaxing and opening blood vessels within muscles to enhance blood flow. Nitric oxide can help deliver more nutrients and oxygen to muscle while removing more metabolic waste.* Bodybuilders often use nitric oxide as part of a complete nutritional regimen that includes protein powder and creatine.

The nitric oxide boosters in this section incorporate known precursors like arginine, citrulline and L-norvaline. Many are available in powder form to add to water, while others come in convenient tablet form.