Six Star Pro Nutrition N.O. Fury is a powerful Nitric Oxide Matrix, based on L-arginine and L-citrulline. These two molecules promote the production of NO – nitric oxide – which is a well-known vasodilator. As a result, more blood rushes to your skeletal muscles carrying oxygen and nutrients – and, there’s more blood available to flush out lactic acid buildup associated with post-workout fatigue. Boosting your nitric oxide levels enables you to exercise harder and for longer periods of time, enhances your muscle pumps and improves your recovery.