What does nitric oxide actually do in my body?
Nitric oxide is a molecule your blood vessels produce that helps them relax and widen, supporting healthy blood flow. It’s a real, well-established part of how your cardiovascular system works day to day — not a marketing concept.
Is nitric oxide the same as nitrous oxide?
No — despite the similar names, these are two completely different substances. Nitric oxide is a molecule your own body makes to help regulate blood flow. Nitrous oxide (“laughing gas”) is a separate compound used medically as an anesthetic. The name overlap is a common source of confusion, not a real connection.
Can I just take a nitric oxide supplement?
Nitric oxide itself is a short-lived gas your body produces — supplements don’t contain nitric oxide directly; instead, they provide ingredients (like nitrate, L-arginine, or L-citrulline) your body can use to make more of it. Every real “nitric oxide supplement” works indirectly, not by delivering the gas itself. See our food vs. supplement comparison for how the different ingredients compare.
Do nitric oxide test strips actually work?
Nitric oxide test strips sold to consumers actually measure a different, related molecule (nitrite) — not nitric oxide itself. They can’t directly detect nitric oxide, which exists in your body for only a fraction of a second.
What foods help support nitric oxide production?
Eating nitrate-rich vegetables — like beetroot, spinach, and other leafy greens — may modestly help support healthy blood pressure for some people. See our full breakdown for what a real, evidence-backed amount looks like.
Can my oral care routine affect my body’s nitric oxide production?
Yes, in a real but easy-to-miss way: certain bacteria in your mouth play a necessary role in converting dietary nitrate into a form your body can use, and regularly using antiseptic mouthwash may interrupt that process. This doesn’t mean skipping oral hygiene — see our guide to oral care and nitric oxide for the full, careful picture.
Does humming really increase nitric oxide?
Yes — humming has been shown to increase nitric oxide levels in the nose by roughly 15 times compared to quiet breathing. This effect is local to the sinuses, though — it hasn’t been shown to raise nitric oxide throughout the body the way dietary nitrate does. See our full explanation.
Is it better to get nitric oxide support from food or from a supplement?
For most people, food-based sources are the best-evidenced, lowest-risk starting point — they support the same real pathway supplements are trying to support, plus real nutritional value supplements don’t provide. Supplements aren’t inherently unsafe, but they’re less tightly regulated and evidence varies by product. See our full food vs. supplement comparison for the details.
Is it safe to take a nitric oxide supplement with my medication?
If you take a nitrate medication (such as nitroglycerin), you should never combine it with erectile dysfunction medicines like sildenafil (Viagra) or tadalafil (Cialis) — the combination can cause a dangerous drop in blood pressure. Several other real medication and interaction categories also matter. See our full guide to nitrate medications and drug interactions for the full explanation, and always follow your doctor’s or pharmacist’s guidance.
Can nitric oxide supplements detox my body or reverse aging?
Claims that nitric oxide supplements can “detox” the body, reverse aging, or reliably treat chronic disease are not supported by current evidence. What the real evidence does support is more modest: helping support healthy blood pressure and, for some athletes, aerobic exercise performance. See our full look at nitric oxide supplement myths for a closer look at what the supplement marketing gets wrong.
References
- Tran, N., Garcia, T., Aniqa, M., Ali, S., Ally, A., & Nauli, S. M. (2022). Endothelial nitric oxide synthase (eNOS) and the cardiovascular system: in physiology and in disease states. American Journal of Biomedical Science and Research, 15(2), 153–177. https://pmc.ncbi.nlm.nih.gov/articles/PMC8774925/
- Norouzzadeh, M., Rashedi, M. H., Payandeh, N., Harijani, A. M., & Shahinfar, H. (2024). The effects of dietary nitrate on blood pressure and vascular health: An umbrella review and updated meta-analysis and meta-regression. Journal of Functional Foods, 114, 106082. https://doi.org/10.1016/j.jff.2024.106082
- Weitzberg, E., & Lundberg, J. O. N. (2002). Humming greatly increases nasal nitric oxide. American Journal of Respiratory and Critical Care Medicine, 166(2), 144–145. https://doi.org/10.1164/rccm.200202-138BC
- Schwartz, B. G., & Kloner, R. A. (2010). Drug interactions with phosphodiesterase-5 inhibitors used for the treatment of erectile dysfunction or pulmonary hypertension. Circulation, 122(1), 88–95. https://doi.org/10.1161/CIRCULATIONAHA.110.944603
- Kaynarkaya, B., Eren, Ş., & Şeker, E. N. (2026). Nitric oxide supplement: Evidence-based benefits, risks, and practical guidance. Acibadem International Health Library. https://acibademinternational.com/health-library/nitric-oxide-supplement-evidence-based-benefits-risks-and-practical-guidance/
- Kaynarkaya, B., & Eren, Ş. (2026). Nitric oxide — Explained by medical evidence, not myths. Acibadem International Health Library. https://acibademinternational.com/health-library/nitric-oxide-explained-by-medical-evidence-not-myths/
About this article
Researched and written by: HealthUpward Editorial Team
Last updated: August 29, 2026
Evidence basis: Based on peer-reviewed research and reputable public health organizations cited within this article.
Medical review: This article has completed HealthUpward’s editorial review process. It has not been reviewed by a licensed healthcare professional.
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