Humming Can Increase Beneficial Nitric Oxide

Humming has been shown to significantly increase the production of nitric oxide (NO) in the nasal passages—by as much as 15- to 20-fold compared to quiet exhalation. Nitric oxide is a naturally occurring molecule in the body that plays several vital roles, including vasodilation (the widening of blood vessels), enhancing blood flow, and supporting cardiovascular and respiratory health.

This dramatic rise in NO levels during humming is one reason why certain breathing practices and vocal sounds—like chanting "Om" or "Aum"—are deeply embedded in meditative traditions. For instance, Buddhist monks and yogic practitioners have long used these practices not just to quiet the mind and induce a meditative state, but also to create physiological benefits such as improved oxygenation, enhanced relaxation, and possibly even mild antimicrobial effects in the sinuses due to nitric oxide’s known antibacterial properties.

The modern science behind these ancient practices suggests that tonal vocalization may provide measurable health benefits by activating endogenous nitric oxide pathways, promoting calmness, mental clarity, and better circulation.