Beetroot for Endurance: The Nitric Oxide Connection
Why beetroot became elite-athlete fuel
In 2009, a small study at Exeter University showed that drinking 500 ml of beetroot juice raised endurance by up to 16%. Fifteen years later, beetroot is standard kit for cyclists, runners and rowers worldwide.
The science: nitrate to nitric oxide
Beetroot is rich in dietary nitrate (NO3-). Bacteria in your mouth reduce it to nitrite (NO2-). Stomach acid converts that to nitric oxide (NO), a vasodilator that:
- Widens blood vessels (lower blood pressure)
- Improves oxygen delivery to muscles
- Reduces the oxygen cost of exercise
The right dose
Effective range: 300-600 mg of nitrate consumed 90-150 minutes before performance. Capsule form delivers this without 500 ml of juice and stained teeth.
Mistakes that kill the effect
- Antibacterial mouthwash destroys the oral bacteria you need – avoid for 24h before
- Taking it 15 min before – peak nitric oxide is at 2-3 hours
- Combining with proton pump inhibitors – stomach acid is part of the conversion
Beyond athletes
Beetroot also supports blood pressure reduction (-4 to -10 mmHg systolic) in mild hypertension, and is being studied for cognitive blood flow in older adults.
Side effects
Pink urine and stool. Harmless. Some people get GI discomfort with high doses – split the dose or take with a small meal.
What we recommend
Our SUPPLI-X Organic Beetroot Capsules deliver standardized nitrate per serving with no juice mess. Take 90 minutes before training or race day.
Bottom line
Beetroot is one of the few supplements with well-established performance gains in clinical trials. It is cheap, natural and works.