Nitrate (NO3−)
A relatively stable inorganic ion found naturally in vegetables and other foods.
Dietary Nitrates: Food Sources, Nitric Oxide & What Research Shows
Dietary nitrate is a naturally occurring inorganic compound found especially in leafy green vegetables and beetroot. It is part of the nitrogen cycle in plants and also participates in an important pathway in the human body involving nitrate, nitrite, and nitric oxide.
Interest in dietary nitrate has grown because nitric oxide is involved in blood-vessel signaling, blood flow, muscle physiology, and other biological processes.
However, nitrate in a vegetable, nitrate in an isolated supplement, nitrate-rich beetroot juice, nitrite used in food preservation, and nitric oxide in the body are not interchangeable concepts.
The food or preparation tested, the nitrate dose, the study population, and the outcome measured all matter when interpreting the research.
The Short Answer
Dietary nitrate (NO3−) is an inorganic ion found naturally in many vegetables, particularly leafy greens and beetroot.
After nitrate is consumed, part of it can enter an enterosalivary nitrate–nitrite–nitric oxide pathway. Oral bacteria convert nitrate to nitrite, and nitrite can subsequently contribute to formation of nitric oxide.
Human trials have studied dietary nitrate in relation to blood pressure, vascular measurements, exercise performance, and other physiological outcomes. Findings are meaningful in some areas but are not consistent across every population, dose, or outcome.
Compound type
Inorganic ion naturally present in many vegetables.
Chemical formula
Nitrate: NO3−
Key biological pathway
Nitrate → nitrite → nitric oxide.
What Is Dietary Nitrate?
Nitrate is an inorganic ion with the chemical formula NO3−.
Plants absorb nitrogen from soil in forms that include nitrate. As a result, nitrate naturally occurs in many vegetables and is an ordinary component of the human diet.
Vegetables account for a large proportion of dietary nitrate intake in many diets.
Nitrate concentrations are particularly notable in certain leafy vegetables, stems, and root vegetables. However, the amount present can vary substantially depending on plant species, cultivar, soil conditions, fertilizer use, sunlight, temperature, maturity, storage, and processing.
Dietary nitrate should also be distinguished from organic nitrate medications such as nitroglycerin. They have different chemical structures and pharmacology.
Nitrate vs. Nitrite vs. Nitric Oxide
Nitrate, nitrite, and nitric oxide are related but chemically distinct.
Nitrite (NO2−)
Can be formed from nitrate by bacteria and can also be used in regulated food-preservation applications.
Nitric Oxide (NO)
A short-lived signaling molecule produced in the body through several biochemical pathways.
Nitric oxide participates in processes that include regulation of vascular tone, blood flow, platelet activity, and muscle physiology.
That does not mean that eating any nitrate-containing food automatically produces a predictable amount of nitric oxide or a guaranteed physiological effect.
How Does Dietary Nitrate Become Nitric Oxide?
One important route is commonly called the enterosalivary nitrate–nitrite–nitric oxide pathway.
The process can be summarized in several stages:
Nitrate is consumedIn food or another preparation.
Nitrate is absorbedFrom the digestive tract into the bloodstream.
Nitrate enters salivaSome circulating nitrate is concentrated in saliva by the salivary glands.
Oral bacteria form nitriteNitrate-reducing bacteria in the mouth convert nitrate to nitrite.
Nitrite is swallowedIt can undergo additional chemical and enzymatic reactions.
Nitric oxide can formNitrite can contribute to nitric oxide formation, particularly under certain acidic or low-oxygen conditions.
This pathway complements the body's separate nitric-oxide-synthase pathway, which produces nitric oxide from the amino acid L-arginine.
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What Foods Are High in Nitrate?
Nitrate occurs in many vegetables, but concentrations vary widely.
Foods commonly reported among the higher-nitrate vegetables include:
- Arugula or rocket
- Spinach
- Lettuce
- Swiss chard
- Celery
- Watercress
- Radishes
- Beet greens
- Beetroot
- Parsley and certain other leafy herbs
Leafy vegetables can contain as much or more nitrate than beetroot.
For this reason, describing beetroot as the highest dietary source would be too broad. Beetroot is one of the best-known sources largely because it has been used extensively in human nitrate research.
Why Does Nitrate Content Vary So Much?
Two samples of the same vegetable do not necessarily contain the same nitrate concentration.
Factors that can influence nitrate accumulation include:
- plant species and cultivar;
- which part of the plant is eaten;
- soil nitrogen availability;
- fertilizer practices;
- sunlight and growing environment;
- temperature;
- harvest maturity;
- storage conditions; and
- food processing and preparation.
This variability is particularly important when interpreting beetroot studies because two beet juices can provide very different nitrate doses.
Nitrate in Beetroot
Beetroot is one of the most widely studied nitrate-containing vegetables.
But nitrate is only one part of beet chemistry.
Beetroot can also contain:
- betalain pigments;
- betaine;
- phenolic compounds;
- organic acids;
- minerals;
- sugars; and
- other naturally occurring constituents.
This matters when researchers use whole beetroot or beetroot juice.
An observed effect from a beet preparation cannot automatically be attributed to nitrate unless the study design allows researchers to distinguish nitrate from other beet constituents.
Some clinical trials address this by comparing nitrate-rich beetroot juice with a similar nitrate-depleted beetroot placebo.
Nitrate
An inorganic ion involved in the nitrate–nitrite–nitric oxide pathway.
Betalains
Red-violet and yellow-orange plant pigments.
Betaine
An organic compound involved in osmotic regulation and methyl-group metabolism.
Because all three can be present in beet products, broad statements about “beet benefits” can hide important differences in what a study actually tested.
Does Beet Juice Contain Nitrate?
Beetroot naturally contains nitrate, so beet juice can contain nitrate derived from the starting vegetable.
However, nitrate concentration can differ substantially among juices and concentrates.
Factors include:
- beet variety;
- growing conditions;
- starting-juice nitrate concentration;
- processing;
- degree of concentration;
- serving size;
- storage; and
- analytical method.
Without finished-product analytical testing, a specific nitrate amount should not be assigned to FruitFast Beet Juice Concentrate based solely on published values for raw beets or other beet juices.
Brix also does not measure nitrate content. Brix primarily reflects dissolved soluble solids and cannot be used as a substitute for a nitrate assay.
Related FruitFast product: Beet Juice Concentrate 32 oz
This product link is provided for navigation. Without finished-product analytical testing, a specific nitrate amount should not be assigned to FruitFast Beet Juice Concentrate from published values for raw beets or other beet products. Brix is not a nitrate assay.
Dietary Nitrate & Human Research: What Has Been Studied?
Human trials have investigated dietary nitrate most extensively in relation to vascular measurements and exercise physiology.
Results depend on the nitrate dose, source, participant population, study duration, placebo, baseline health, and outcome measured.
Blood Pressure Research
Blood pressure is one of the most extensively studied outcomes.
A 2025 systematic review and dose-response meta-analysis included 75 randomized controlled trials involving more than 1,800 participants.
Across the included studies, higher dietary nitrate doses were associated with increases in circulating nitrate and nitrite and with modest reductions in blood-pressure measurements.
The analysis also reported changes in vascular measurements including flow-mediated dilation and pulse-wave velocity.
However, these studies primarily evaluate short- and medium-term physiological measurements. They do not establish that dietary nitrate prevents heart attacks, strokes, or other cardiovascular events.
Research in People With Hypertension
Nitrate-rich beetroot juice has also been studied specifically in people with hypertension.
A 2024 systematic review and meta-analysis reported a reduction in clinic systolic blood pressure across included randomized trials.
However, significant effects were not observed for every blood-pressure measurement, including some diastolic and 24-hour outcomes, and the authors rated the certainty of the evidence as low.
This means beetroot juice should not be described as a substitute for prescribed blood-pressure treatment.
Vascular Function Research
Researchers also use measurements such as flow-mediated dilation, arterial stiffness, plasma nitrite, and other vascular biomarkers to investigate dietary nitrate.
Some trials and pooled analyses report favorable differences in these measurements.
A change in a vascular biomarker, however, is not the same thing as demonstrating prevention or treatment of cardiovascular disease.
Dietary Nitrate & Exercise Performance Research
Exercise physiology is another major area of nitrate research.
Studies have used nitrate-rich beetroot juice, concentrated beet preparations, nitrate salts, and high-nitrate diets.
A 2025 umbrella review combined evidence from 20 systematic reviews with meta-analyses, representing 180 primary studies and more than 2,600 participants.
The results were mixed.
Dietary nitrate supplementation was associated with favorable differences in some outcomes, including:
- time-to-exhaustion performance;
- total distance covered in certain exercise tests;
- muscular endurance;
- selected peak-power measurements; and
- time to peak power.
However, significant improvements were not found across all exercise outcomes.
The authors also rated the methodological quality of most included systematic reviews as low or critically low.
That means the evidence supports dietary nitrate as a legitimate sports-nutrition research topic, but not a guarantee that nitrate will improve every athlete, every workout, or every measure of performance.
How to Interpret Beetroot & Nitrate Research
Beetroot is a useful research vehicle for dietary nitrate, but beetroot juice is still a complex food preparation. Dose, placebo design, population, and the exact outcome measured all affect what a study can establish.
Why Do Nitrate Studies Use Beetroot Juice?
Beetroot juice is convenient for research because it can provide a measurable nitrate dose in a relatively small volume.
Researchers can also produce nitrate-depleted beetroot preparations that resemble nitrate-rich beet juice in other respects.
This allows some studies to investigate whether nitrate itself contributes to an observed effect.
Even so, beetroot juice remains a complex food preparation rather than isolated nitrate.
Does More Nitrate Always Produce a Bigger Effect?
No.
Research suggests that dose can influence circulating nitrate and nitrite and may influence some physiological outcomes, but biological responses do not increase indefinitely in a simple straight line.
Factors such as baseline diet, oral bacteria, training status, age, cardiovascular health, timing, duration, and individual metabolism can influence response.
More nitrate should therefore not automatically be interpreted as better.
Safety, Food Source & Processing Context
Nitrate From Vegetables vs. Nitrate and Nitrite in Processed Meat
The nitrate ion itself is chemically the same regardless of its food source.
What differs is the food matrix and chemical environment in which nitrate or nitrite is consumed.
Vegetables that contain nitrate commonly also provide compounds such as vitamin C, polyphenols, and other plant constituents.
Nitrite and nitrate are also used under regulated conditions in certain cured and processed meats because they contribute to microbial safety, preservation, color, and flavor.
Under some chemical conditions, nitrite can participate in reactions that form N-nitroso compounds, including certain nitrosamines.
The formation of these compounds is influenced by multiple factors, including food composition, heme iron, amines, processing conditions, cooking, acidity, and the presence of compounds that inhibit or promote nitrosation.
For this reason, it is too simplistic to say that “vegetable nitrate is good and meat nitrate is bad.” The source and surrounding food matrix matter, and processed-meat health research cannot be reduced to nitrate or nitrite alone.
Are Dietary Nitrates Safe?
Nitrate is a normal component of many vegetables and of human nitrogen metabolism.
Safety questions depend heavily on the source, amount, population, and chemical context.
Nitrate and nitrite have historically raised concerns because, under certain conditions, they can contribute to formation of N-nitroso compounds.
At the same time, research over the past several decades has established that nitrate and nitrite also participate in normal nitric-oxide biology.
Modern reviews therefore evaluate dietary nitrate using a benefit–risk framework rather than treating every source of nitrate exposure as equivalent.
Vegetable intake should also not be judged solely by the nitrate content of individual vegetables. Vegetables provide many nutrients and plant compounds and are evaluated as whole foods within dietary patterns.
What About Nitrate in Drinking Water?
Nitrate in drinking water is a separate exposure question from nitrate naturally occurring in vegetables.
Water-quality limits are designed to address specific safety concerns, including excessive nitrate exposure in susceptible populations such as infants.
Research involving contaminated or high-nitrate drinking water should therefore not automatically be used to characterize nitrate-rich vegetables.
Does Cooking or Processing Change Nitrate?
Food preparation can influence nitrate content.
For example, boiling can reduce nitrate content in some vegetables because nitrate is water soluble and can leach into cooking water.
Juicing can redistribute nitrate into the liquid portion of the food, while concentration can change the amount present per unit of volume.
Storage can also influence nitrate and nitrite measurements depending on the food, temperature, microbial activity, and duration.
The important point for finished products is that nitrate content should be determined analytically rather than estimated solely from the original vegetable.
Frequently Asked Questions About Dietary Nitrates
What are dietary nitrates?
Dietary nitrates are naturally occurring inorganic nitrate ions found in foods, especially leafy vegetables and beetroot.
What foods are highest in nitrate?
Leafy vegetables such as arugula, spinach, lettuce, chard, celery, and watercress can contain high nitrate concentrations. Beetroot is another well-known source. Exact rankings vary because nitrate concentrations change with cultivar, growing conditions, storage, and measurement method.
Are beets the highest-nitrate food?
Not necessarily. Beetroot is nitrate-rich, but some leafy vegetables—particularly arugula, spinach, lettuce, and related greens—can contain equal or higher nitrate concentrations.
What is the difference between nitrate and nitrite?
Nitrate is NO3−, while nitrite is NO2−. Oral bacteria can reduce dietary nitrate to nitrite, and nitrite can subsequently contribute to nitric oxide formation.
Is nitric oxide the same as nitrate?
No. Nitric oxide is a short-lived signaling molecule, while nitrate is a more stable inorganic ion. Dietary nitrate can contribute indirectly to nitric oxide formation through the nitrate–nitrite–nitric oxide pathway.
Do nitrates lower blood pressure?
Randomized human studies and meta-analyses have reported modest reductions in blood-pressure measurements following dietary nitrate supplementation. Effects vary by dose, population, duration, and preparation, and these findings do not establish dietary nitrate as a treatment for hypertension.
Does beet juice improve exercise performance?
Some nitrate-rich beetroot studies report improvements in selected endurance, muscular-endurance, or power-related outcomes, while other outcomes show little or no significant effect. The overall evidence is mixed and depends on the exercise test, dose, participant, and study design.
Does FruitFast Beet Juice Concentrate contain nitrate?
Beetroot naturally contains nitrate, so a beet-derived juice or concentrate may contain nitrate originating from the starting vegetable. However, without finished-product analytical testing, a specific nitrate amount should not be assumed for FruitFast Beet Juice Concentrate.
Does a higher Brix mean more nitrate?
No. Brix is a measure related primarily to soluble solids. It does not directly measure nitrate and should not be used to estimate the nitrate content of beet juice concentrate.
Are nitrate and betaine the same thing?
No. Nitrate is an inorganic ion. Betaine is an organic glycine derivative involved in osmotic regulation and methyl-group metabolism.
Are nitrate and betalains the same thing?
No. Betalains are plant pigments responsible for red-violet and yellow-orange colors in beetroot and other betalain-containing plants. Nitrate is chemically unrelated to these pigments.
Are nitrates in vegetables different from nitrates in processed meat?
The nitrate ion itself is chemically the same. What differs is the food matrix, accompanying compounds, processing, and the conditions that influence conversion to nitric oxide or formation of N-nitroso compounds.
Does antibacterial mouthwash affect dietary nitrate metabolism?
Human experiments indicate that some antibacterial mouthwashes can suppress nitrate-reducing oral bacteria and reduce conversion of nitrate to nitrite. That does not mean someone should stop a medically or dentally recommended mouthwash without professional guidance.
How much dietary nitrate should I take?
Research studies use a wide range of nitrate doses, and those experimental doses should not be treated as universal recommendations. The nitrate content of natural foods and beet products can also vary substantially.
How to Evaluate Dietary Nitrate Research
When reading a nitrate study, first determine exactly what researchers tested.
A study may involve:
- Whole nitrate-rich vegetables
- Beetroot juice
- Nitrate-depleted beetroot juice
- Concentrated beetroot shots
- Sodium or potassium nitrate
- A high-nitrate diet
- Nitrite rather than nitrate
These interventions are not interchangeable.
It is also useful to consider:
- Nitrate dose — How much nitrate did participants actually receive?
- Population — Were participants healthy, trained athletes, older adults, or people with hypertension?
- Duration — Was the study acute, several days, or several weeks?
- Control treatment — Was nitrate-depleted beetroot juice used or a completely different placebo?
- Oral microbiome — Were antibacterial mouthwash or oral-hygiene practices controlled?
- Outcome — Plasma nitrite, blood pressure, vascular function, oxygen cost, time to exhaustion, power, or a clinical health outcome?
- Other compounds — Did the preparation also contain betalains, betaine, polyphenols, sugars, or other constituents?
An increase in plasma nitrite, a change in blood pressure, an improvement in one exercise test, and prevention of cardiovascular disease represent very different levels of evidence.
Scientific References & Sources
The following publications are provided so readers can review the physiology, dietary sources, safety context, and human research discussed on this page. Results involving purified nitrate, beetroot juice, nitrate-rich vegetables, exercise supplements, biomarkers, or specific study populations should not automatically be applied to other foods or products.
1. Lundberg JO, Weitzberg E, Gladwin MT. The nitrate-nitrite-nitric oxide pathway in physiology and therapeutics. Nature Reviews Drug Discovery. 2008;7(2):156-167. doi:10.1038/nrd2466. PMID: 18167491.
2. Hord NG, Tang Y, Bryan NS. Food sources of nitrates and nitrites: the physiologic context for potential health benefits. American Journal of Clinical Nutrition. 2009;90(1):1-10. doi:10.3945/ajcn.2008.27131. PMID: 19439460.
3. Kapil V, Haydar SMA, Pearl V, Lundberg JO, Weitzberg E, Ahluwalia A. Physiological role for nitrate-reducing oral bacteria in blood pressure control. Free Radical Biology and Medicine. 2013;55:93-100. doi:10.1016/j.freeradbiomed.2012.11.013. PMID: 23183324.
4. Norouzzadeh M, Hasan Rashedi M, Ghaemi S, et al. Plasma nitrate, dietary nitrate, blood pressure, and vascular health biomarkers: a GRADE-Assessed systematic review and dose-response meta-analysis of randomized controlled trials. Nutrition Journal. 2025;24:47. doi:10.1186/s12937-025-01114-8. PMID: 40128734.
5. Grönroos R, Eggertsen R, Bernhardsson S, Praetorius Björk M. Effects of beetroot juice on blood pressure in hypertension according to European Society of Hypertension Guidelines: A systematic review and meta-analysis. Nutrition, Metabolism and Cardiovascular Diseases. 2024;34(10):2240-2256. doi:10.1016/j.numecd.2024.06.009. PMID: 39069465.
6. Poon ETC, Iu JCK, Sum WMK, et al. Dietary Nitrate Supplementation and Exercise Performance: An Umbrella Review of 20 Published Systematic Reviews with Meta-analyses. Sports Medicine. 2025;55(5):1213-1231. doi:10.1007/s40279-025-02194-6. PMID: 40085422.
7. Kotopoulou S, Zampelas A, Magriplis E. Dietary nitrate and nitrite and human health: a narrative review by intake source. Nutrition Reviews. 2022;80(4):762-773. doi:10.1093/nutrit/nuab113. PMID: 34919725.
8. Habermeyer M, Roth A, Guth S, et al. Nitrate and nitrite in the diet: how to assess their benefit and risk for human health. Molecular Nutrition & Food Research. 2015;59(1):106-128. doi:10.1002/mnfr.201400286. PMID: 25164923.
About This Guide
This page is provided for general educational purposes. Research involving dietary nitrate, nitrite, beetroot juice, concentrated beet preparations, nitrate salts, processed foods, biomarkers, athletes, or clinical populations should not be assumed to establish the same effect for other foods, products, or individuals.
This information is not intended to diagnose, treat, cure, or prevent any disease and should not be interpreted as medical advice.