Beet juice is the liquid extracted from raw or cold-pressed beetroot. It is one of the most extensively researched sports nutrition foods of the past two decades, with a substantial body of evidence supporting its effects on exercise performance through a specific and well-understood physiological mechanism. Understanding that mechanism makes beet juice one of the few nutritional supplements with genuinely strong scientific support rather than marketing-driven claims.
What Beet Juice Is
Beet juice is produced by pressing, juicing, or blending raw beetroot (Beta vulgaris) and extracting the liquid. It can be:
Cold-pressed: The most nutritionally complete method. Raw beetroot is pressed without heat, preserving the nitrate content, betalain pigments, and other heat-sensitive compounds.
Centrifugal juiced: Faster and more common with home juicers. Produces more heat and slight oxidation but retains most of the nitrate content.
Concentrated shots: Commercial beet juice shots (such as the Beet It brand used in much of the academic research) are concentrated beet juice reduced to a small volume (typically 70ml) containing a standardised nitrate dose. These are the format used in most performance research.
Fermented: Some products use fermented beet juice, which has a different flavour profile and altered nitrate content.
The defining nutritional characteristic of beet juice is its exceptionally high dietary nitrate content, which is the basis of its performance and health applications.
Nutritional Profile
Per 100ml of raw beet juice (approximately):
- Calories: 43
- Carbohydrates: 10 grams
- Natural sugars: 7 to 8 grams
- Dietary nitrate: 250 to 400mg (this varies significantly by soil and growing conditions)
- Betalains: 40 to 60mg (the red-purple pigments with antioxidant properties)
- Folate: 109mcg (approximately 27 percent DRI)
- Potassium: 325mg
- Vitamin C: 4mg
- Manganese: meaningful contribution toward daily needs
The nitrate content is the primary nutritional differentiator of beet juice. For context, most vegetables contain 10 to 100mg of nitrate per 100 grams. Beetroot contains 250 to 400mg per 100ml of juice — among the highest nitrate content of any commonly consumed food.
The Nitrate Mechanism: Why Beet Juice Works
This is the most important section of this article. Beet juice’s benefits are not vague or mechanism-unknown — they operate through a specific, well-researched physiological pathway.
Step 1: Dietary Nitrate to Nitrite
When beet juice is consumed, the dietary nitrate (NO3) in the juice is absorbed in the small intestine and enters the bloodstream. Approximately 25 percent of this circulating nitrate is taken up by the salivary glands and secreted into saliva. Bacteria naturally present on the tongue and in the oral cavity convert the salivary nitrate into nitrite (NO2) through enzymatic reduction.
This is why mouthwash before beet juice consumption eliminates its performance benefits. Antibacterial mouthwash kills the oral bacteria that perform this conversion. Research has confirmed that subjects who use antibacterial mouthwash before consuming beet juice do not show the expected reductions in blood pressure or improvements in exercise economy.
Step 2: Nitrite to Nitric Oxide
The nitrite in saliva is swallowed and enters the stomach and bloodstream. Under the acidic conditions of the stomach and in low-oxygen tissue environments (such as contracting skeletal muscle during exercise), nitrite is further converted to nitric oxide (NO).
Nitric oxide is a signalling molecule with powerful vasodilatory effects: it causes the smooth muscle in blood vessel walls to relax, widening the vessels and increasing blood flow.
Step 3: The Physiological Effects
The increased nitric oxide production from dietary nitrate consumption produces several specific physiological effects relevant to exercise performance:
Vasodilation and increased blood flow: Wider blood vessels deliver more oxygen and nutrients to working muscles per unit of time. Research using Doppler ultrasound has confirmed increased blood flow to exercising muscles following beet juice consumption.
Reduced oxygen cost of exercise (improved exercise economy): This is the most consistently measured effect in research. Multiple studies have found that athletes consuming beet juice perform the same amount of work at a measurably lower oxygen consumption. The effect size is approximately 2 to 3 percent reduction in oxygen cost, which is physiologically significant — equivalent to several weeks of endurance training.
Reduced blood pressure: The vasodilatory effect of increased nitric oxide produces measurable reductions in systolic and diastolic blood pressure, typically 4 to 8mmHg reduction in systolic pressure in research studies. This effect occurs within 2 to 3 hours of consumption.
Improved mitochondrial efficiency: More recent research has found that dietary nitrate improves the efficiency of mitochondrial ATP production, meaning more energy is produced per unit of oxygen consumed. This is a cellular-level effect that contributes to the improved exercise economy measured at the whole-body level.
Reduced muscle fatigue: Research on high-intensity exercise has found that beet juice supplementation reduces the decline in muscle force production during repeated high-intensity efforts, suggesting a fatigue-reducing effect through the nitric oxide pathway.
The Performance Research: What the Evidence Shows
The research on beet juice and exercise performance is among the strongest in sports nutrition:
Endurance performance: A 2009 landmark study by Bailey et al. found that recreational cyclists who consumed beet juice for 6 days showed a 16 percent improvement in time to exhaustion during moderate-intensity cycling compared to placebo. This effect size is large by exercise physiology standards.
Subsequent research has found more modest but consistent performance benefits: improvements in time trial performance of 1 to 3 percent in trained cyclists and runners, which translates to meaningful competitive advantages.
High-intensity and intermittent exercise: Research on team sport athletes (football, rugby) has found improvements in repeated sprint performance, reduced fatigue during high-intensity efforts, and improved work rates during match-play simulations following beet juice supplementation.
Altitude performance: The nitrate-to-nitric-oxide pathway is particularly active in low-oxygen conditions. Research on beet juice at altitude has found greater performance benefits than at sea level, making it a particularly useful strategy for athletes competing or training at altitude.
The trained athlete limitation: Some research suggests that highly trained athletes show smaller benefits from beet juice than recreationally trained athletes. The proposed mechanism is that highly trained athletes already have elevated nitric oxide synthesis capacity from training adaptations. This does not mean beet juice is ineffective for elite athletes — benefits have been demonstrated at all levels — but the effect size may be smaller.
Beet Juice Versus Eating Whole Beets
A practical question for people who prefer whole food approaches: does eating beetroot provide the same benefits as drinking beet juice?
The nitrate content: Whole beetroot contains the same nitrate as the juice on a weight-for-weight basis. Approximately 200 grams of cooked beetroot provides a similar nitrate dose to a 70ml concentrated beet juice shot.
The practical difference: To consume the equivalent nitrate dose through whole beets, approximately 200 grams of beet must be eaten, which is a larger volume of food. Drinking a 70ml concentrated shot before competition is more practical than eating a significant serving of whole beets.
Cooking effects: Boiling beetroot leaches some nitrate into the cooking water and destroys some heat-sensitive compounds. Roasting retains more nitrate than boiling. Raw beetroot retains the full nitrate content. For maximum nitrate delivery, raw beet juice or cold-pressed beet juice is more efficient than cooked whole beets.
The betalain content: Whole beets retain more betalain pigments than commercial beet juice shots, which are sometimes processed in ways that reduce betalain content. For the antioxidant benefits of betalains specifically, whole beets may be preferable to concentrated shots.
Organic beetroot powder: As covered in the organic beetroot powder article on this site, concentrated beetroot powder is an alternative form that provides a similar nitrate profile to juice in a shelf-stable, portable format.
Dosing and Timing Guidance
Dose: Most research uses 300 to 600mg of dietary nitrate, equivalent to approximately 500ml of high-nitrate beet juice or two 70ml concentrated beet shots. The dose-response relationship suggests that 300mg of nitrate is near the threshold for measurable performance effects and that doses beyond 600mg provide diminishing additional returns.
Timing: The peak blood nitrite concentration following beet juice consumption occurs 2 to 3 hours after ingestion. Research has found the greatest performance benefits when beet juice is consumed 2 to 3 hours before exercise. Consuming it immediately before training is suboptimal because the nitrate has not yet been converted through the full oral bacteria pathway.
Duration: Single acute doses (one-time consumption before exercise) produce acute performance benefits. Chronic supplementation (consuming beet juice daily for 3 to 15 days before competition) may produce additional adaptations beyond the acute effect, though the evidence for chronic benefits beyond the acute dose is less clear.
Practical protocol for athletes:
- Competition day: Two 70ml concentrated beet shots 2 to 3 hours before the event
- Training: One 70ml shot or 250ml of high-nitrate beet juice 2 to 3 hours before the session
- Do not use antibacterial mouthwash in the period between consuming beet juice and competition
Taste and Palatability
Beet juice has a distinctive earthy, slightly sweet flavour that many people find challenging. Practical strategies for improving palatability:
Apple and ginger combination: The sweetness of apple and the warmth of ginger are among the most effective flavour pairings with beet juice. As covered in the how to eat beets article on this site, this combination is the most commonly recommended for raw beet preparations.
Citrus addition: Orange or lemon juice added to beet juice reduces the earthy flavour through the acidity.
Concentrated shots: The 70ml concentrated shot format means less total volume needs to be consumed for the full research-supported dose, making palatability less of an issue than it would be with larger juice volumes.
Gradual introduction: Many people find that beet juice palatability improves significantly after the first few exposures as the flavour becomes more familiar.
The urine and stool colour note: Beet juice causes temporary pink or red discolouration of urine (beeturia) and sometimes stools in approximately 10 to 14 percent of people. This is harmless and caused by the betalain pigments passing through the digestive system without being fully metabolised. It can be alarming if unexpected.
Frequently Asked Questions
Does beet juice lower blood pressure?
Yes, based on consistent research evidence. Dietary nitrate from beet juice produces nitric oxide-mediated vasodilation that reduces systolic blood pressure by approximately 4 to 8mmHg in research studies. This is a meaningful effect, comparable to the blood pressure reduction from some lifestyle interventions. Anyone with clinically diagnosed hypertension should discuss dietary nitrate supplementation with their doctor as it may interact with blood pressure management.
How quickly does beet juice work?
Blood pressure effects are measurable within 2 to 3 hours of consumption. Performance benefits follow a similar timeline. The peak blood nitrite (the active intermediate in the pathway) occurs at approximately 2 to 3 hours post-consumption, which is why this timing window is recommended before exercise.
Is beet juice safe for everyone?
For most healthy people, yes. People with kidney stones or a history of kidney stones should be cautious because beet juice is high in oxalates, which contribute to the most common type of kidney stone (calcium oxalate). People taking medications for blood pressure or erectile dysfunction (which also work through nitric oxide pathways) should consult their doctor before regular beet juice consumption.