Beetroot has been studied for nearly two decades. The interest is not based on tradition. It is based on a well-understood physiological pathway.
Dietary nitrate, found in beetroot, converts to nitric oxide in the body. Nitric oxide relaxes blood vessels, improves blood flow, and reduces the oxygen cost of exercise.
This guide covers what the research actually shows, who benefits most, and where the evidence is still developing.
In This Guide
- How Beetroot Works
- What the Research Shows
- Who Responds Best
- Dosing and Timing
- Beetroot for Recovery
- The Standardisation Problem
- Summary
- Sources
How Beetroot Works
Beetroot is rich in dietary nitrate. When you consume it, the nitrate follows a specific pathway.
Oral bacteria on the tongue convert nitrate (NO₃⁻) to nitrite (NO₂⁻). Nitrite enters the bloodstream. In tissues where oxygen is low — like working muscles during exercise — nitrite is reduced to nitric oxide (NO).
Nitric oxide performs three functions that matter for endurance:
1. Vasodilation. NO signals blood vessels to relax and widen. This increases blood flow and oxygen delivery to working muscles.
2. Mitochondrial efficiency. NO enhances mitochondrial efficiency, enabling greater ATP production at a lower oxygen cost.
3. Muscle contractility. NO supports calcium handling in muscle fibers and may reduce the ATP cost of force production.
The result: your muscles use less oxygen to produce the same power. This is improved oxygen efficiency — a metabolic effect, not a stimulant one.
Critical rule: Antibacterial mouthwash kills the oral bacteria required for this conversion. Research shows it abolishes the nitrate-to-nitrite conversion and markedly reduces the rise in plasma nitrite. Avoid mouthwash, tongue scraping, and breath mints for at least 2 hours after taking beetroot.
The result: your muscles use less oxygen to produce the same power. This is improved oxygen efficiency — a metabolic effect, not a stimulant one.
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What the Research Shows
Time to Exhaustion
A 2025 umbrella review in Sports Medicine analysed 20 systematic reviews covering 180 primary studies and 2,672 participants. It found that nitrate supplementation significantly improved time-to-exhaustion tasks (SMD: 0.33; 95% CI 0.19–0.47).
The effects were most pronounced when two conditions were met: a minimum dose of 6 mmol/day (approximately 372mg nitrate) and a chronic supplementation protocol of more than 3 days.
The review authors noted that most included studies were rated low to critically low on methodological quality.
Total Distance and Muscular Endurance
The same review found improvements in total distance covered (SMD: 0.42) and muscular endurance (SMD: 0.48).
Peak Power Output
Peak power output improved with nitrate supplementation (SMD: 0.25).
VO₂ Max
A 2025 umbrella review in Nutrients examined 15 meta-analyses on beetroot juice and physical performance. It found that beetroot juice significantly improved VO₂max (SMD = 0.16, p = 0.033) in healthy adults.
Oxygen Cost
The foundational research by Bailey et al. (2009) found that dietary nitrate reduced the oxygen cost of submaximal exercise by up to 5%.
Aerobic and Anaerobic Performance
A 2026 meta-analysis in Frontiers in Nutrition examined 33 studies on beetroot juice and both aerobic and anaerobic performance. It found that beetroot juice improves both. High-intensity interval sprint performance improved (SMD = 0.38; 95% CI 0.17–0.59; p < 0.001). Mean power output improved (SMD = 0.43; 95% CI 0.21–0.64; p < 0.001). VO₂max improved (SMD = 0.30; 95% CI 0.05–0.55; p < 0.001). Heterogeneity was low across all outcomes.
Who Responds Best
This is the part most supplement brands will not tell you.
This is the part most supplement brands will not tell you.
Recreational and moderately trained athletes respond more than elites.
Research consistently shows that beetroot's effect on oxygen cost is most pronounced in untrained and moderately trained individuals. Well-trained athletes already have high baseline nitric oxide levels and superior endothelial function. The additional benefit from nitrate supplementation is smaller.
A 2025 umbrella review found population-specific effects: beetroot juice improved muscular strength in professional athletes (SMD = 0.27) and aerobic endurance in non-athletes (SMD = 0.26).
This does not mean elite athletes should not use beetroot. It means they need precise timing and a high-quality whole-root source — not simply bigger scoops. The margin is smaller, so the quality of the product matters more.
Dosing and Timing
The Evidence-Based Dose
| Parameter | Recommendation |
| Acute dose | 6–12.4 mmol nitrate (370–750mg) |
| Timing | 2–3 hours before exercise |
| Loading protocol | 1–2 doses daily for 3–7 days before key event |
A 2025 umbrella review recommended nitrate levels of 8.3–16.4 mmol (515–1017 mg/day) for performance enhancement. The same review noted that the effect size at this dose was negligible, and called for higher-quality trials.
Peak Effect Window
A 2013 study by Wylie et al. found that plasma nitrite peaks 2.5–3 hours after consumption. Starting your session inside this window ensures your blood vessels are fully dilated and oxygen delivery is maximised.
At 8.4 mmol, oxygen uptake was reduced by 1.7% and time-to-task failure extended by 14%. At 16.8 mmol, oxygen uptake was reduced by 3.0% and time-to-task failure extended by 12%. There was no additional improvement at the higher dose — the dose-response plateaus.
Why the Timing Matters
Nitrate conversion takes time. Taking beetroot 30 minutes before training misses the peak window. The acute effect is most pronounced 2–3 hours after ingestion.
Beetroot for Recovery
Beetroot does more than improve oxygen efficiency during exercise. It also supports recovery.
Reduced Muscle Soreness
A 2022 systematic review and meta-analysis in the Journal of Dietary Supplements examined the effect of nitrate-rich beetroot juice on markers of exercise-induced muscle damage. Nine studies were included in the systematic review and six in the meta-analysis.
The findings:
- Isometric strength recovery was accelerated 72 hours post-exercise (SMD: 0.54, p = 0.01)
- Countermovement jump performance improved 24–72 hours post-exercise (SMD range: 0.75–1.32)
- Pressure pain threshold was greater with beetroot juice at 48 hours (SMD: 0.58, p = 0.03) and 72 hours (SMD: 0.61, p = 0.02)
No effect was found on oxidative stress markers or creatine kinase. All studies were rated to have "some concerns" for risk of bias.
The Betalain Connection
Beetroot contains betalains — antioxidant pigments unique to beetroot. Betalains have demonstrated antioxidant and anti-inflammatory properties that may help attenuate inflammation and oxidative stress, enhancing recovery from exercise-induced muscle damage.
How to Use for Recovery
Take 1 tablespoon of Stamox within 30–60 minutes after a hard session. Pair it with protein and carbohydrates for optimal recovery.
Why Batch Quality Matters
This is the most important practical issue in beetroot supplementation.
ConsumerLab testing found that nitrate content varied more than 200-fold across beetroot juices, powders, and chews — from just 2.2 mg per serving to 495.6 mg per serving.
One product claimed equivalency to three whole beets but contained less than 4% of the expected nitrate. One beetroot chew contained so little nitrate you would need more than 100 to match a glass of beetroot juice.
What this means: If you use a generic beetroot juice or powder, you do not know what you are getting. One scoop might deliver 400 mg of nitrate. The next might deliver 50 mg. This makes it hard to build a predictable training or race protocol.
What to look for instead:
- A patented extraction process that preserves the full matrix
- Transparent sourcing and batch testing
- A product made from premium beetroots, not juice concentrate
- Formulated in a regulated jurisdiction with anti-doping testing
Stamox is a patented whole-root beetroot extract. It is made from premium beetroots, formulated in Norway since 2007, and anti-doping tested. Every serving delivers the whole-root matrix — nitrates, betaine, betalains, and polyphenols.
Whole Root vs. Isolated Nitrate
The research is clear: whole beetroot outperforms isolated nitrate salts.
A 2022 meta-analysis in Advances in Nutrition examined 123 studies. Beetroot juice improved exercise performance (P < 0.001). Isolated nitrate salts did not (P = 0.629).
A 2024 mini-review by Zoughaib et al. concluded that beetroot juice "may offer additional advantages" over nitrate salts for VO₂ reduction and recovery. The proposed mechanism: the antioxidant and anti-inflammatory properties of the full spectrum of phytonutrients in beetroot.
Summary
| Question | Answer |
| What does beetroot do? | Increases nitric oxide, improving blood flow and oxygen efficiency |
| What is the evidence base? | 180 studies, 2,672 participants, IOC Level A |
| How much do you need? | 6–12.4 mmol nitrate (370–750mg) |
| When should you take it? | 2–3 hours before exercise |
| Does it help recovery? | Yes. Reduces soreness and accelerates strength recovery |
| Who responds best? | Recreational and moderately trained athletes show larger effects |
| What is the biggest mistake? | Using generic beetroot juice with unknown active compound content |
| What kills the effect? | Antibacterial mouthwash, tongue scraping, breath mints |
This article is part of the Stamox Performance series.
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Sources
All studies referenced in this guide are publicly available on PubMed. We only cite peer-reviewed, published research.
Poon, E.T., et al. (2025). Dietary Nitrate Supplementation and Exercise Performance: An Umbrella Review of 20 Published Systematic Reviews with Meta-analyses. Sports Medicine, 55(5), 1213-1231. View on PubMed →
Tian, C., et al. (2025). Effects of Beetroot Juice on Physical Performance in Professional Athletes and Healthy Individuals: An Umbrella Review. Nutrients, 17(12), 1958. View on PubMed →
Bailey, S.J., et al. (2009). Dietary nitrate supplementation reduces the O₂ cost of low-intensity exercise and enhances tolerance to high-intensity exercise in humans. Journal of Applied Physiology, 107(4), 1144-1155. View on PubMed →
Jones, L., et al. (2022). The Effect of Nitrate-Rich Beetroot Juice on Markers of Exercise-Induced Muscle Damage: A Systematic Review and Meta-Analysis of Human Intervention Trials. Journal of Dietary Supplements, 19(6), 749-771. View the study →
Silva, K.V.C., et al. (2022). Factors that Moderate the Effect of Nitrate Ingestion on Exercise Performance in Adults. Advances in Nutrition, 13(5), 1866-1881. View on PubMed →
Wylie, L.J., et al. (2013). Beetroot juice and exercise: pharmacodynamic and dose-response relationships. Journal of Applied Physiology, 115(3), 325-336. View on PubMed →
ConsumerLab.com. (2025). ConsumerLab's Tests of Beetroot and Nitrate Products Yield Shocking Findings. View the report →
Zoughaib, W.S., et al. (2024). Beetroot juice supplementation and exercise performance: is there more to the story than just nitrate? Frontiers in Nutrition, 11, 1347242. View on PubMed →
Cai, C., et al. (2026). Effectiveness of beetroot juice on aerobic and anaerobic exercise performance: systematic review and meta-analysis. Frontiers in Nutrition, 13, 1844096. View the study →
How We Source Our Information
Every claim on this blog is backed by peer-reviewed research and Stamox R&D data. We cite studies from PubMed, the International Olympic Committee's consensus statements, and the Australian Institute of Sport's supplement framework.
This article was last reviewed October 2026.
