Did you know your body has a clever way of defending against viruses? The respiratory epithelial cells that line your nose and lungs produce high levels of nitric oxide. Nitric oxide functions as a signaling molecule to initiate the inflammatory response to viruses. And that nitric oxide is produced in the sinuses. Breathing through your nose, not your mouth, causes nitric oxide to be excreted continuously into the nasal airways.

So, to activate this powerful immune response found in nitric oxide all you have to do is breathe through your nose!