Nitric oxide starts with biology, not a miracle food.

Your blood vessels rely on signals that help them relax. Nitric oxide is part of that process. So which foods contribute to it, and how much does the science actually say about sexual performance?

The useful question is whether a food supports a measurable physiological pathway. Clinical trials must separately measure whether eating that food changes erectile outcomes.

The bottom line. Beetroot and certain leafy vegetables are dietary nitrate sources. Watermelon supplies citrulline, which the body can convert into arginine. Dietary nitrate research has found vascular effects, but a grocery list is not a treatment for erectile dysfunction.

1. Where nitric oxide enters the picture

Nitric oxide participates in the relaxation of blood vessels and the erectile response. Dietary nitrate can be converted through a nitrate-to-nitrite pathway, while citrulline supports another route through arginine. These are mechanisms, not guarantees of a particular result.

Supported by clinical evidence

A 2025 meta-analysis of randomized trials found that dietary nitrate exposure can increase circulating nitrate and nitrite, with modest effects on blood-pressure outcomes in studied populations. It did not establish that nitrate-rich meals reliably improve erections.

2. Foods worth understanding

Beetroot

What it provides: Dietary nitrate.

What research shows: A 2024 review of beetroot juice trials found a reduction in clinic systolic blood pressure in some adults with hypertension, though certainty was low and findings varied. Blood pressure is not an erection score.

Beet powder: a convenient alternative

Why men consider it: Powder is easier to store and mix than fresh beetroot or refrigerated beet juice. It can provide dietary nitrate, but the word beetroot on the label does not tell you how much nitrate is in a serving.

What independent measurements found: A study of commercial beet products measured large differences in nitrate content across products and even across lots. A 2025 analysis of thirteen beetroot powders also found high variability. Powder weight, color, and the label's serving size cannot establish an equivalent nitrate exposure.

What to check: Look for a stated nitrate amount per serving and credible batch testing. A beet powder with no disclosed nitrate content is an unpredictable substitute for a nitrate-standardized product used in a study. Higher concentration does not automatically mean better sexual function or greater safety.

Arugula and spinach

What they provide: Dietary nitrate within a wider pattern of vegetables, fiber and micronutrients.

What remains unknown: Whether adding a particular serving to your meal changes sexual performance independently of other health habits.

Watermelon

What it provides: Citrulline, an amino acid involved in arginine production.

What research shows: Citrulline has been investigated as a supplement in small studies. Eating watermelon is not equivalent to the quantities used in a supplement trial, so effects cannot be assumed from that research.

3. A practical takeaway without buying anything

Build meals around vegetables you already enjoy. Leafy greens, beetroot and other colorful produce fit a heart-healthy eating pattern. You can explore them as ordinary foods rather than trying to engineer an immediate sexual response.

Be alert to the difference between dietary nitrate in food and nitrate-containing prescription medicines. If you take blood-pressure medications, have low blood pressure or live with kidney disease, ask a clinician about major dietary changes or concentrated products. Persistent erection difficulty deserves medical evaluation because it can be linked to vascular, metabolic or other health conditions, as explained by NIDDK.

4. The question to keep asking

Does this claim measure a vascular biomarker, or does it actually measure sexual function in people like the reader? That single question prevents much of the confusion in nitric oxide marketing.

Next: supplement evidenceWhat controlled trials say about citrulline, arginine and popular herbs.Back to the Research LabBrowse the evidence framework and other investigations.

Sources and further reading

2025 dietary nitrate meta-analysisSupports the nitrate-to-nitrite and vascular findings, not an erection-specific benefit.
2024 beetroot juice reviewSupports a possible blood-pressure effect with low-certainty evidence.
Analysis of commercial beet juice and powder productsSupports the large nitrate-content differences across commercial preparations and production lots.
2025 analysis of beetroot powdersSupports the variability and standardization concerns in powdered beetroot products sold online.
NIDDK erectile dysfunction treatment informationSupports the importance of assessment for persistent erectile symptoms.

Last reviewed: 29 October 2026Reviewed by: The Blueprint editorial team. No clinician has reviewed this page.

Medical note: General educational material for adults 18 and older, not a diagnosis or treatment plan. Persistent sexual symptoms, pain, bruising, numbness, new deformity or any sudden change in function should be evaluated promptly by a qualified healthcare professional. An erection lasting more than four hours is a medical emergency.