Nitric Oxide (NO) is a little known molecule, yet very famous in scientific circles. The extent of what NO can do in your body is profound. Nitric Oxide: clears the nose relaxes blood vessels protects against angina and chest pain lowers blood pressure relaxes heart muscle supports the immune system communication molecule with the brain Reduces stress and anxiety Many people are Nitric Oxide defient, so this is where Buteyko breathing comes in as it enhances nitric oxide Nitric Oxide is produced