What Foods Are High In Nitric Oxide?

Nitric oxide is a molecule your body produces naturally that helps blood vessels relax and open up. More open blood vessels mean better blood flow, which supports healthy blood pressure and oxygen delivery to your muscles and organs. The foods highest in nitric oxide are those rich in nitrates — mainly leafy greens, beets, and celery — plus foods that provide the building blocks your body uses to make it, like certain proteins and antioxidants.

How Does Food Actually Boost Nitric Oxide?

Your body makes nitric oxide through two main pathways. The first uses an enzyme called nitric oxide synthase to convert the amino acid L-arginine into nitric oxide. The second pathway involves dietary nitrates, which your body converts into nitrites and then into nitric oxide.

This second pathway is why certain vegetables get so much attention. When you eat nitrate-rich vegetables, bacteria in your mouth help convert the nitrate into nitrite. When you swallow, that nitrite reaches your stomach and bloodstream, where it becomes nitric oxide. This process is well established in human physiology.

The body also needs certain cofactors to make this work efficiently. Antioxidants like vitamin C and polyphenols help protect nitric oxide from breaking down too quickly. That is why eating nitrate-rich vegetables alongside vitamin C sources can be more effective than eating them alone.

What Foods Are High In Nitric Oxide?

The most reliable way to raise nitric oxide through diet is to eat foods naturally high in nitrates. These are almost all vegetables, and the amounts vary significantly between them.

• Arugula — consistently one of the highest nitrate vegetables per serving.
• Beets and beet juice — well studied for their nitrate content and effects on blood flow.
• Spinach — high in nitrates and widely available.
• Celery — a solid source of nitrates plus other beneficial plant compounds.
• Lettuce — especially darker varieties like romaine and butterhead.
• Cabbage — a good source, particularly when eaten raw.
• Carrots — moderate nitrate content.
• Radishes — contain meaningful amounts of nitrates.

For the L-arginine pathway, foods high in this amino acid include poultry, turkey, pork, fish, dairy products, and legumes like soybeans and peanuts. These foods are less directly tied to nitric oxide production than vegetables, but they supply the raw material your body needs.

Antioxidant-rich foods matter too. Citrus fruits, berries, dark chocolate, and green tea contain polyphenols and vitamin C that help preserve nitric oxide in your body. Some research suggests that pairing these with nitrate-rich vegetables improves the overall effect.

Does Cooking Affect Nitrate Levels?

Yes, cooking changes nitrate content in vegetables. Boiling leaches nitrates into the water, which you then discard. Steaming and roasting cause smaller losses. Eating vegetables raw generally preserves the highest nitrate content.

If you prefer cooked vegetables, steaming is a reasonable choice. The nitrate loss is modest compared to boiling. For beets specifically, roasting preserves more nitrates than boiling.

One important detail: chewing is part of the process. The bacteria in your mouth need contact with the food to convert nitrates into nitrites. Antibacterial mouthwash can reduce this conversion significantly. Some studies have shown that using mouthwash regularly lowers the amount of nitric oxide your body can produce from dietary nitrates.

How Much Do You Need To Eat?

There is no official daily requirement for dietary nitrates. However, research studies that show benefits typically use amounts that are achievable through food. A common approach in clinical studies is a serving of beet juice containing around 300 to 500 milligrams of nitrate, or a large salad of arugula and other leafy greens.

For reference, a 100-gram serving of arugula contains roughly 250 milligrams of nitrate. A 100-gram serving of beetroot contains around 110 to 150 milligrams. Spinach provides about 80 to 120 milligrams per 100 grams.

Eating a large salad with several cups of leafy greens, or drinking a glass of beet juice, is enough to measurably increase nitric oxide levels in the blood. The effect typically peaks a few hours after eating and returns to baseline within a day.

No clinical guidelines currently exist for a specific daily nitrate target. The general advice is to eat a diet rich in vegetables, which naturally provides these compounds.

Do Nitrate Supplements Work?

Nitrate supplements, usually in the form of beetroot powder or concentrated beet juice, do raise nitric oxide levels. The evidence for their effectiveness is similar to whole foods. They are not more effective than eating the actual vegetables, but they are more convenient.

Some supplements claim to boost nitric oxide using L-arginine or L-citrulline. L-citrulline is an amino acid that your body converts into L-arginine. The evidence for these supplements is mixed. Some studies show modest benefits for athletic performance and blood flow, while others show little effect.

No large human trials have confirmed that any supplement is superior to eating nitrate-rich vegetables. If you are considering a supplement, the evidence is stronger for beetroot-based products than for single amino acid formulas. But whole foods remain the best studied and most reliable option.

Can You Have Too Much Nitrate?

Dietary nitrates from vegetables are generally considered safe. The concern about nitrates and nitrites usually comes from processed meats, where nitrites are added as preservatives. The World Health Organization has classified processed meats as carcinogenic, partly due to nitrite additives and their conversion to nitrosamines in the body.

The same conversion to nitrosamines can happen with vegetable nitrates, but the risk is much lower. Vegetables contain vitamin C and other compounds that inhibit nitrosamine formation. This is why the health effects of vegetable nitrates are different from those of processed meat additives.

For healthy adults, eating several servings of nitrate-rich vegetables daily is not a safety concern. People with certain medical conditions, such as those taking medications for erectile dysfunction or some blood pressure drugs, should talk to their doctor. Nitric oxide-boosting medications can interact with high nitrate intake and cause blood pressure to drop too low.

Which Foods Should You Pair Together?

Pairing nitrate-rich vegetables with vitamin C sources can improve nitric oxide availability. A salad with arugula and orange slices, or roasted beets with a squeeze of lemon, are practical combinations.

Nuts and seeds provide L-arginine and can complement vegetable-based nitrate intake. Pumpkin seeds, walnuts, and almonds are reasonable additions to a nitric oxide-friendly diet.

Green tea and dark chocolate contain polyphenols that may help maintain nitric oxide levels. These are not substitutes for vegetables, but they add variety and additional antioxidant support.

Do You Need To Avoid Anything?

Antibacterial mouthwash is the most well-documented factor that reduces dietary nitrate conversion. If you are intentionally eating nitrate-rich foods to support nitric oxide production, using mouthwash afterward will blunt the effect.

Antacid medications that reduce stomach acid can also affect the conversion process, though the evidence is less clear. Some research suggests that a more acidic stomach environment helps convert nitrite to nitric oxide more efficiently.

Smoking is another factor. Tobacco smoke contains compounds that interfere with nitric oxide production and damage blood vessels. Quitting smoking has a larger effect on nitric oxide levels than any food you could add to your diet.