How to Increase Nitric Oxide Naturally: Food, Exercise and Evidence

Wondering how to increase nitric oxide? Start with behaviors that benefit cardiovascular health regardless of any laboratory biomarker: regular exercise, a vegetable-rich dietary pattern, smoking avoidance and appropriate blood-pressure care. Nitrate-rich vegetables can supply one of the body's biochemical routes to nitric oxide, while activity supports endothelial responsiveness. Supplements may have selected uses, but the evidence depends on the ingredients and outcomes.

Two distinct pathways to know

Your vascular endothelium synthesizes nitric oxide through nitric-oxide synthase, using L-arginine. A second route begins with inorganic nitrate from vegetables: nitrate is concentrated in saliva, oral bacteria convert part of it to nitrite and nitrite can contribute to nitric-oxide production in the body. Neither system is an unlimited pump; oxygen, oxidative stress, oral microbiota and vascular health all influence the response.

1. Include nitrate-rich vegetables in a balanced diet

Beetroot, arugula or rocket, spinach, celery and other leafy greens can contribute dietary nitrate. Content varies with soil, growing conditions, season, storage and preparation, so generic online charts should not be mistaken for a precise assay of the vegetables on your plate. A varied vegetable-rich diet also supplies fiber, minerals and other constituents, which makes it a better foundation than relying on one concentrated ingredient.

A practical approach is to add a serving of leafy greens to a meal and include beetroot as part of a normal balanced diet if you enjoy it. People with significant kidney disease, individualized potassium restrictions or other special diets should follow their clinician's instructions rather than blanket high-vegetable prescriptions.

2. Make movement a regular part of the week

Walking, cycling, swimming and resistance exercise each support cardiovascular health through multiple processes, including endothelial adaptations. Some human studies suggest exercise improves vascular responsiveness with age, but chasing an immediate “NO spike” is not necessary to benefit. Start with the level appropriate to your health, progress gradually and seek medical advice for chest pain, exercise-limiting symptoms or unstable cardiovascular disease.

3. Understand the oral microbiome—without neglecting oral health

Tongue bacteria help reduce nitrate to nitrite. Small human studies have reported that short courses of strong antiseptic mouthwash can blunt this conversion and affect NO-related biomarkers. That is a mechanistic observation, not evidence to discontinue an antiseptic rinse prescribed after dental surgery or for gum disease. Maintain brushing, flossing and professional dental care, and ask your dentist before changing any prescribed rinse.

4. Control the factors that damage endothelial health

Smoking, poorly controlled blood pressure, diabetes, inactivity and adverse lipid profiles are important vascular risk factors. Stopping smoking, treating hypertension, managing diabetes and maintaining physical activity improve health through pathways far wider than NO alone. There is no supplement substitute for these interventions or for medical assessment of persistent symptoms.

5. Compare supplements by what the trial actually tested

Several nutritional approaches can alter nitric-oxide-related biomarkers, but they are not equivalent. A 2025 dietary-nitrate meta-analysis of 75 RCTs found changes in circulating nitrate/nitrite and small average blood-pressure effects. The 2025 exercise umbrella review found improvements for some but not all athletic endpoints. The 2008 direct pharmacokinetic study found citrulline raised plasma arginine efficiently at certain doses. Each result answers a different question.

6. Use the right unit when reading a label

A claim such as “800 mg beetroot” does not establish how many milligrams of inorganic nitrate are supplied. A “6 g citrulline malate” label does not necessarily mean 6 g of pure L-citrulline. In a proprietary blend, constituent amounts may be undisclosed. Compare products on analytically verified active-ingredient content, dose tested in humans and current batch information rather than assuming a bigger number means more NO.

What about DoNotAge Nitralis?

Its 2025 product-specific pilot measured saliva-strip changes over 30 days, with a reported 400 mg daily study intervention. Its current retail label recommends 800 mg per day. Product-specific research is useful, but that trial did not directly measure blood pressure, endothelial function, stamina or clinical longevity outcomes. Our Data Center collects the pilot, laboratory-validation research and broader ingredient trials.

Can home nitric oxide strips track your progress?

Not reliably as a clinical measure of vascular health. Semi-quantitative strips may reflect salivary nitrite-related changes and depend on oral chemistry and measurement conditions. They do not directly establish plasma NO levels, improved artery function or treatment success. Blood pressure, laboratory tests and formal cardiovascular evaluation should be used when clinically indicated.

When supplements need a medication review

Anyone with symptomatic low blood pressure, recent heart attack, unstable cardiovascular disease, pregnancy or relevant prescribed medicines should consult a qualified clinician or pharmacist first. In particular, prescription organic nitrates and sildenafil-type medicines are contraindicated together; food nitrate is not the same medication category, but an unverified multi-ingredient formula still warrants individualized assessment. Read our full interaction guide.

A reasonable daily routine

Build movement into your day, eat varied vegetables across meals, maintain oral hygiene and take prescribed cardiometabolic medicines as directed. If you are considering a concentrated nitrate shot or amino-acid supplement for a specific objective, identify the outcome measured in comparable people, check the actual active dose and keep the expected effect modest. Reevaluate the decision if adverse symptoms appear.

FAQ

What is the fastest natural way to raise NO?

Nitrate-rich foods can alter nitrate metabolites within hours in some studies, but a faster biomarker change is not automatically a clinically better result. Exercise and diet remain longer-term foundations.

Does mouthwash destroy nitric oxide?

Some antiseptic mouthwashes impair oral nitrate-reducing activity during short interventions. Do not abandon necessary dental care without professional advice.

Should everyone take citrulline or beetroot?

No. Individual goals, baseline health, medications, trial evidence and actual product dose determine whether adding a supplement is reasonable.

Sources and further reading

• NIH ODS — Exercise supplement evidence
• Norouzzadeh et al. — Dietary nitrate meta-analysis
• Schwedhelm et al. — Citrulline pharmacokinetics
• Vanhatalo et al. — Aging, oral bacteria and nitrate