Supplement analysis backed by scientific evidence · PT

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Moderate evidencePhysical performance

Beetroot (Dietary Nitrate)

Beetroot juice raises nitric oxide availability and produces small but real improvements in endurance and repeated high-intensity work, mostly in recreational athletes. The effect shrinks toward zero in elite endurance athletes, who already have high baseline nitrate handling.

What the science says

  • Endurance and time-to-exhaustion performance Moderate evidence

    A 2022 systematic review with meta-regressions across dozens of RCTs found nitrate ingestion produced a small overall benefit for exercise performance, with time-to-exhaustion tests responding more than time-trial tests. Doses of at least 6.4 mmol nitrate taken 2-3 hours pre-exercise, or loaded for 3+ days, moderated the effect; training status mattered, with recreationally trained participants gaining more than highly trained ones.

  • High-intensity interval and repeated-sprint work Moderate evidence

    A meta-analysis of beetroot ingestion during high-intensity interval training reported small improvements in work output and time to exhaustion, consistent with nitrate's preferential action on type II muscle fibres. Effects are in the 1-3% range, meaningful competitively but invisible to most recreational trainees.

  • Blood pressure lowering Moderate evidence

    Inorganic nitrate consistently lowers systolic blood pressure by roughly 3-5 mmHg in meta-analyses of short-term trials, with larger effects in hypertensive participants. No trial has run long enough to show reduced cardiovascular events, so this remains a surrogate-endpoint finding.

  • Benefit in elite endurance athletes Limited evidence

    Trials in well-trained and elite endurance athletes are frequently null. Higher baseline nitric oxide synthase activity and greater type I fibre reliance are the leading explanations; if you are already highly trained, expect little or nothing.

Dosage & safety

Studied dose6.4-12.8 mmol nitrate (roughly 400-800 mg), typically one to two 70 mL concentrated beetroot shots. Take 2-3 hours before exercise for the peak plasma nitrite window. Multi-day loading (3-15 days at the same daily dose) may work better than a single acute dose for some events. Whole beetroot juice needs about 500 mL to reach an effective dose.
SafetyWell tolerated. Beeturia (pink/red urine and stool) is harmless but alarming if unexpected. GI discomfort is common at higher juice volumes. Antibacterial mouthwash abolishes the effect by killing the oral bacteria that reduce nitrate to nitrite, so avoid it around dosing. Use caution if you take nitrate medications for angina or PDE5 inhibitors, as additive vasodilation can cause hypotension. Not prohibited in sport.

Scientific references

Where to buy

Nature's Truth, Nitric Oxide Max™, Beet Root+ with Nitrates, 60 Capsules

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