Nasal breathing can lead to vasodilation, increased blood flow, and improved nutrient delivery and waste removal through nitric oxide production.

“But it turns out that breathing through your nose will allow some dilation of the vasculature, more blood flow, dilation of the nasal passages, and delivery of nitric oxide to all the tissues of your body. And that dilation of the small capillaries that innervate essentially every organ of your body allow the delivery of more nutrients and the removal of carbon dioxide and other waste products from those tissues more readily than if you're not getting enough-- excuse me-- nitric oxide into your system.”