Beetroot / Beet Root: Blood Pressure, Exercise Performance & Nitric Oxide — Evidence Review
⚡ 60-Second Summary
Beetroot (Beta vulgaris) supplements work primarily through their high inorganic nitrate content (250–300 mg nitrate per 100 mL beetroot juice). Dietary nitrate is converted by oral bacteria to nitrite, which is then reduced to nitric oxide (NO) in tissues — a vasodilator that relaxes blood vessel walls and reduces peripheral resistance.
Best-evidenced uses: Blood pressure reduction (multiple meta-analyses confirm ~4–5 mmHg systolic and ~2 mmHg diastolic reduction); exercise performance (time-to-exhaustion, VO2 economy, especially in moderate-intensity exercise); cardiovascular health. Benefits are strongest in people with elevated blood pressure and less pronounced in trained athletes.
Practical note: Beetroot juice (70–140 mL concentrated) and high-nitrate beetroot powder are the best-studied forms. Beetroot supplements labeled only by root weight (not nitrate content) are unreliable for predictable effects. Avoid antibacterial mouthwash immediately after taking beetroot — it kills the oral bacteria needed for nitrate-to-nitrite conversion.
What is Beetroot / Beet Root?
Inorganic nitrate in beetroot is absorbed in the upper GI tract and ~25% is actively secreted by salivary glands. Oral bacteria (primarily Veillonella and Actinomyces species) reduce salivary nitrate to nitrite, which is absorbed and transported to tissues. In low-oxygen environments (exercising muscle, hypoxic tissue), nitrite is further reduced to NO by hemoglobin, myoglobin, and xanthine oxidase. NO dilates blood vessels, reduces mitochondrial O2 consumption per unit work, and improves exercise economy.
Dietary nitrate-mediated blood pressure reduction was established in a landmark 2008 Lancet paper (Webb et al.) showing that 500 mL beetroot juice reduced systolic BP by ~10 mmHg within 3 hours. Since then, over 80 RCTs have confirmed cardiovascular and performance effects. Meta-analyses now provide the strongest evidence base for any dietary nitrate source.
Evidence-based benefits
1. Blood pressure reduction
Multiple meta-analyses (>20 RCTs combined) confirm beetroot/dietary nitrate reduces systolic BP by ~4–5 mmHg and diastolic BP by ~1–2 mmHg in adults with elevated BP. Effect is dose-dependent and peaks 2–3 hours after ingestion. Best in stage 1 hypertension; less in trained athletes with normal BP.
2. Exercise economy and performance
Beetroot juice reduces the O2 cost of submaximal exercise (improved economy) and extends time to exhaustion at fixed intensity by 10–25% in recreational exercisers. Effect on elite athletes is smaller; highly trained individuals are resistant to further improvement.
3. Cardiovascular and endothelial health
Studies show improved endothelial function (flow-mediated dilation), reduced arterial stiffness, and platelet aggregation inhibition. Long-term implications for cardiovascular risk are not established from RCTs.
Supplement forms compared
| Form | Typical dose / Bioavailability | Best for | Notes |
|---|---|---|---|
| Beetroot juice concentrate (shots) | 70 mL shot = ~400 mg nitrate | Exercise, BP — fast onset (2–3h) | Most studied; best nitrate delivery. Avoid antibacterial mouthwash. High in natural sugars. |
| High-nitrate beetroot powder | Varies — check nitrate content label | Exercise, BP | Convenient; look for products listing actual nitrate content (not just beet root weight). |
| Fermented/standardized beetroot extract | Varies | Research ongoing | Some brands add nitrate quantification; still less studied than juice. |
| Generic beet root capsules | Often very low nitrate | Unknown benefit | Nitrate content rarely disclosed; unlikely to reach therapeutic threshold. |
How much should you take?
- Blood pressure: 200–500 mg nitrate/day (approx. 70–140 mL concentrated juice)
- Exercise performance: 400–600 mg nitrate ~2–3 hours before exercise
- Generic 'beet root' supplements without nitrate labeling should not be assumed therapeutic
The key variable for beetroot efficacy is nitrate content, not product weight. Concentrated juice shots (70–140 mL) consistently deliver 300–600 mg nitrate. Generic capsules may deliver very little nitrate. Avoid using antibacterial mouthwash or brushing teeth immediately after beetroot — this disrupts the oral bacteria responsible for nitrate-to-nitrite conversion.
Safety and side effects
Common side effects
- Beeturia: pink/red urine and stools (harmless but alarming to some; occurs in ~14% of people)
- GI discomfort at very high doses
- Mild blood pressure lowering — beneficial for most, but monitor if on antihypertensives
Serious risks
Beetroot at typical supplement doses is exceptionally safe. The main concern is additive hypotension in people already taking blood pressure medications — the combination can cause excessive BP reduction. Beetroot also contains moderate oxalate; people with calcium oxalate kidney stones should moderate intake.
Drug and nutrient interactions
- Antihypertensives — additive BP reduction; monitor and adjust medication with physician guidance
- Sildenafil (Viagra), tadalafil — both increase NO signaling; additive vasodilation and hypotension risk
- Anticoagulants — beetroot may modestly inhibit platelet aggregation; monitor
Check our free interaction checker for additional combinations.
Who might benefit — and who should use caution
| Most likely to benefit | Use with caution or seek guidance |
|---|---|
| People with pre-hypertension or stage 1 hypertension | People on multiple antihypertensives — risk of excessive BP lowering |
| Recreational exercisers and endurance athletes seeking performance support | People with recurrent calcium oxalate kidney stones — moderate beet intake |
| Individuals with high cardiovascular risk seeking dietary NO support | Elite trained athletes — smaller absolute performance gain than in recreational athletes |
Frequently asked questions
Does beetroot actually lower blood pressure?
Yes — this is one of the better-supported claims in nutrition research. Multiple meta-analyses of >20 RCTs consistently show 4–5 mmHg systolic and 1–2 mmHg diastolic reductions. The effect peaks 2–3 hours after consuming 200–500 mg nitrate (70–140 mL concentrated juice). It's clinically meaningful for pre-hypertension and stage 1 hypertension.
How long before exercise should I take beetroot?
2–3 hours before exercise for peak plasma nitrite and performance effects. Some protocols use 3–7 days of loading (daily doses) to build up tissue nitrate stores. For occasional use, a single dose 2–3 hours pre-exercise is effective.
Is beetroot juice better than beet root capsules?
Concentrated beetroot juice shots (70 mL shots with ≥400 mg nitrate) are the best-studied form. Generic beet root capsules often don't disclose nitrate content and may not reach therapeutic thresholds. If using capsules, look for products that specify nitrate content per serving.
Why shouldn't I use mouthwash with beetroot?
Antibacterial mouthwash kills the oral bacteria that convert dietary nitrate to nitrite — the critical first step in beetroot's NO pathway. Studies show antibacterial mouthwash completely blocks beetroot's blood pressure and performance effects. Avoid it for at least 30 minutes after taking beetroot.
Can beetroot replace blood pressure medication?
No. Beetroot produces meaningful but modest BP reductions (~4–5 mmHg systolic). Most antihypertensive medications achieve 8–15 mmHg or more. Beetroot may be a useful dietary adjunct to medication and lifestyle changes, but should not replace prescribed medication without physician guidance.
Related ingredients
L-Citrulline
Another NO-boosting supplement with exercise and cardiovascular evidence.
Pine Bark Extract (Pycnogenol)
Complementary vascular and NO pathway support.
Garlic
Another dietary source with blood pressure and cardiovascular evidence.
Disclaimer: This information is for educational purposes only and should not replace medical advice. Always consult a qualified healthcare provider before starting any supplement, especially if you have a medical condition, are pregnant, or take prescription medications. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.