How to Increase Nitric Oxide Naturally: Start in Your Mouth
Nitric oxide is a signaling molecule your body makes on purpose. It helps blood vessels relax. How to increase nitric oxide naturally starts somewhere unexpected: your mouth.
The Two Routes Your Body Uses to Make Nitric Oxide
The amino-acid route uses the enzyme nitric oxide synthase to convert L-arginine into nitric oxide. L-citrulline feeds it because your kidneys convert citrulline back into arginine [1].
The dietary-nitrate route reduces vegetable nitrate to nitrite, then to nitric oxide: two steps, two places [3].
Both routes support healthy circulation, and both depend on daily choices.
The dietary nitrate route runs in two steps and two places: bacteria on the tongue reduce nitrate to nitrite, then the body converts nitrite to nitric oxide.
The Mouthwash Factor Most People Miss
Nitric oxide from food does not start in your blood vessels. It starts in your mouth.
The nitrate-to-nitrite step depends on bacteria living on your tongue. An antiseptic mouthwash cuts them down, and the effect is measurable: lower oral and circulating nitrite within days [3][4][5].
A habit that feels like hygiene can work against your circulation.
Foods That Support Nitric Oxide
Nitric oxide foods work through three routes: nitrate, antioxidants, and amino acids.
- Nitrate-rich vegetables: beets, arugula, spinach, kale, romaine, and celery [3].
- Antioxidant-rich foods: polyphenols and other antioxidant compounds appear to help protect nitric oxide [6].
- Amino-acid foods: protein supplies L-arginine, and watermelon supplies L-citrulline [1].
Beet root for circulation is the headline, but the wider group matters: about one cup a day of leafy or brassica vegetables [3].
Beets, arugula, kale, romaine, spinach, and celery: the nitrate-rich group the dietary nitrate route depends on.
Do Nitric Oxide Supplements Work?
The honest answer is mixed. Most positive findings come from moderately trained young men, so the picture for women and older adults is thin [1].
A controlled trial found no added benefit from combining beetroot with L-arginine [2].
Nitric oxide support supplements can support the body's own production, but they do not replace the food route.
Safety matters. L-arginine is studied at 6 to 14 grams a day, and digestive upset grows more likely above about 9 grams [1]. Anyone with a medical condition or taking medication should talk with their clinician first. For existing digestive sensitivity, start with our digestive and gastrointestinal support collection.
What We Recommend
The three below are matched to the mechanism above rather than to a marketing angle, and each one covers a different part of it: the dietary nitrate route, circulation, and antioxidant protection. All three are published and in stock on our own store.
1. HumanN, SuperBeets Heart Chews Pomegranate Berry 60 Chews
Vendor: HumanN
A chewable beetroot and grape seed extract blend built around the dietary nitrate route, supporting healthy blood flow.
Shop this product: HumanN, SuperBeets Heart Chews Pomegranate Berry 60 Chews
2. EcoNugenics, Circutol 60 Veg Capsules
Vendor: EcoNugenics
A nattokinase and botanical blend that supports healthy circulation and blood vessel health.
Shop this product: EcoNugenics, Circutol 60 Veg Capsules
3. Pure Encapsulations, Pycnogenol 100 mg 30 and 60 Capsules
Vendor: Pure Encapsulations
A pine bark polyphenol that supports healthy vascular function and antioxidant protection.
Shop this product: Pure Encapsulations, Pycnogenol 100 mg 30 and 60 Capsules
Each one is a single piece of the pattern above, not a replacement for it.
The Bottom Line
Supporting nitric oxide naturally is a pattern, not a pill: nitrate-rich vegetables, antioxidants, protected oral bacteria, and supplements as one part of it.
For the wider picture, start with our heart and circulation hub and the heart-healthy supplements guide.
Frequently Asked Questions
What foods are highest in nitric oxide?
Foods supply the raw material, not nitric oxide itself: beets, arugula, spinach, kale, romaine, and celery [3].
How long does it take to raise nitric oxide levels?
There is no established timeline, and this is not a deficiency you fix overnight.
Is L-arginine or L-citrulline better?
L-citrulline escapes liver breakdown and converts to arginine in the kidneys, so many practitioners favor it [1].
Does mouthwash affect nitric oxide?
Yes. Antibacterial rinses cut the oral bacteria that convert nitrate to nitrite [3][4][5].
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
References
- Kiani et al., 2022. https://pmc.ncbi.nlm.nih.gov/articles/PMC9710401/
- Smeets et al., Nutrients, 2020. https://pmc.ncbi.nlm.nih.gov/articles/PMC7697292/
- Oregon State University Extension, EM 9442. https://extension.oregonstate.edu/catalog/em-9442-say-no-disease-benefits-nitric-oxide
- Kapil et al., 2013. https://pmc.ncbi.nlm.nih.gov/articles/PMC3605573/
- Bondonno et al., American Journal of Hypertension, 2015. https://academic.oup.com/ajh/article-abstract/28/5/572/174874
- Healthline, Nitric Oxide Supplements. https://www.healthline.com/nutrition/nitric-oxide-supplements