Beetroot Juice and Nitrate Supplementation: A Natural Performance Enhancer for Cycling

Introduction

Among all legal sports supplements, beetroot juice may have the richest body of research evidence over the past decade. Since the first landmark study was published in 2007, more than 300 papers have explored the effects of nitrate on exercise performance. For cyclists, a glass of deep-red beetroot juice may be the simplest, cheapest, and safest legal performance-enhancing strategy.

The Mechanism of Action of Nitrate

The Nitric Oxide (NO) Production Pathway

The magic of beetroot juice comes from its high concentration of inorganic nitrate (NO3-). After ingestion, nitrate undergoes the following conversion process:

1. Oral bacterial reduction: Commensal bacteria at the back of the tongue reduce nitrate (NO3-) to nitrite (NO2-)
2. Conversion in the gastric acid environment: Nitrite is partially converted to nitric oxide (NO) in the acidic environment of the stomach
3. Blood circulation: Unconverted nitrite enters the bloodstream
4. Tissue utilization: In low-oxygen environments (such as muscle tissue during exercise), nitrite is further reduced to nitric oxide

Important reminder: Using antibacterial mouthwash will kill the reducing bacteria in the oral cavity, completely blocking this pathway. Avoid mouthwash containing chlorhexidine within 2 hours before and after beetroot juice supplementation.

Physiological Effects of Nitric Oxide

Nitric oxide is a potent vasodilator and cellular signaling molecule that produces the following benefits during exercise:

Vasodilation and Increased Blood Flow

• Dilates blood vessels in exercising muscles, increasing the delivery of oxygen and nutrients
• Improves microcirculation, particularly in fast-twitch muscle fibers (Type II fibers)

Reduced Oxygen Cost of Exercise

• This is the most surprising finding. Nitrate supplementation can reduce oxygen consumption during submaximal exercise by 3-5%
• Possible mechanisms include: improved mitochondrial efficiency (P/O ratio) and enhanced calcium handling in muscle contraction

Enhanced Muscle Contractile Force

• Nitric oxide promotes calcium release from the sarcoplasmic reticulum
• The effect is particularly pronounced during high-frequency contractions (such as sprinting)

Delayed Fatigue

• Improves clearance of metabolic waste during high-intensity exercise
• May reduce the rate of phosphocreatine (PCr) depletion in muscle

Specific Benefits for Cycling Performance

Time Trial Performance

Multiple studies show improvements in cycling time trial performance with nitrate supplementation:

• 4 km time trial: Performance improved by 2.7-2.8% (Lansley et al., 2011)
• 16.1 km time trial: Performance improved by 2.8%, with power output increased by 6 watts (Cermak et al., 2012)
• 50-mile time trial: Performance improved by 0.8% in experienced riders (Porcelli et al., 2015)

High-Intensity Interval Capacity

• Peak power increased by 3-5% in repeated sprint tests
• Time to exhaustion during high-intensity exercise extended by 12-16% (in constant-load exhaustive tests)

High-Altitude Performance

The benefits of nitrate are more pronounced in hypoxic environments, because the conversion of nitrite to nitric oxide is more active under low-oxygen conditions. Studies show benefits of up to 3-5% in exercise tests simulating an altitude of 2,500 meters.

An Important Nuance: The Influence of Training Status

This is an important factor that is often overlooked. Elite athletes typically derive less benefit from nitrate supplementation than recreational athletes:

• Recreational to moderately trained riders: Most pronounced benefits (2-5% improvement)
• Highly trained amateur riders: Benefits exist but are smaller (1-3%)
• Elite/professional riders: Benefits are most uncertain (0-2%), and higher doses may be required

The reason may be that elite athletes already have a highly developed nitric oxide synthase (NOS) pathway and rely less on the nitrate-nitrite pathway.

Optimal Supplementation Protocol

Dosage Recommendations

• Acute supplementation (single dose before competition): 6-8 mmol nitrate (approximately 500 mg NO3-)
• Chronic supplementation (consecutive days): 6-8 mmol daily for 3-7 days
• Elite athletes: May need to increase to 8-16 mmol to observe benefits

Nitrate Content of Common Sources

Source	Nitrate Content	Notes
Concentrated beetroot juice (70ml shot)	~6-7 mmol	Most common form used in research
Fresh beetroot juice (500ml)	~5-8 mmol	Larger volume
Beetroot powder (1 scoop/5g)	~2-4 mmol	Convenient but lower concentration
Spinach (200g)	~4-6 mmol	Food source
Arugula (100g)	~4-7 mmol	High-nitrate vegetable
Lettuce (200g)	~2-4 mmol	Everyday vegetable

Timing of Supplementation

Single acute dose:

• Consume 2-3 hours before competition or training
• Plasma nitrite concentration peaks 2-3 hours after ingestion
• Effects last 4-6 hours

Multi-day loading protocol (recommended for important races):

• Begin daily supplementation of 6-8 mmol 5-7 days before the race
• Take an additional dose 2-3 hours before the start on race day
• Studies show that chronic supplementation may be more effective than a single acute dose

Strategies to Enhance the Effect

Pairing with caffeine:

• The two have different mechanisms of action and can be combined additively
• Caffeine does not interfere with nitrate metabolism

Pairing with carbohydrates:

• Nitrate does not affect carbohydrate absorption or utilization
• Beetroot juice can be safely incorporated into a pre-race carbohydrate loading plan

Avoid taking large amounts of vitamin C at the same time:

• High doses of vitamin C (>500mg) may excessively accelerate the conversion of nitrite in the stomach, reducing the amount of nitrite that enters the bloodstream
• The vitamin C content in normal food is not a concern

Frequently Asked Questions and Precautions

Discoloration of Urine and Stool

The betanin in beetroot will turn urine pink and stool dark red. This is completely normal and is not blood in the urine. The effect subsides within 24-48 hours after stopping intake.

Interference from Mouthwash

As mentioned earlier, mouthwash containing antibacterial agents will kill the commensal bacteria in the oral cavity that reduce nitrate to nitrite. While using beetroot juice, switch to plain water or a mouthwash without chlorhexidine. Similarly, fluoride toothpaste is generally not a problem.

Gastrointestinal Tolerance

A small number of people may experience bloating or diarrhea after drinking concentrated beetroot juice. Recommendations:

• Try it for the first time on a training day, not on race day
• If gastrointestinal discomfort occurs, try splitting the dose or switching to beetroot powder
• Some people find that switching to high-nitrate foods (spinach, arugula salad) works better

Long-Term Safety

Nitrate from food sources is safe. Numerous epidemiological studies show that high vegetable intake (high in nitrate) is associated with a reduced risk of cardiovascular disease. However, it is important to distinguish nitrate from food sources from the nitrite additives in processed meats—the latter may produce nitrosamines when cooked at high temperatures.

Practical Recommendations

Beetroot Juice Protocol for Important Races

1. 7 days before the race: Begin drinking 1 serving of concentrated beetroot juice daily (70ml, ~6 mmol NO3-)
2. 3 days before the race: May increase to 2 servings per day (if gastrointestinal tolerance is good)
3. Race day: Drink 1-2 servings 2.5-3 hours before the start
4. During the race: For long-distance events, an additional serving can be taken midway

DIY High-Nitrate Meals

If you don’t like the taste of concentrated beetroot juice, you can achieve similar effects through your diet:

• Breakfast: Beetroot + apple + ginger juice (homemade)
• Lunch: Arugula + spinach salad with beetroot
• Dinner: Roasted beetroot with whole grains

Conclusion

Beetroot juice is currently one of the most well-evidenced natural sports ergogenic aids. For most cyclists, the correct dosage and timing can deliver a 1-5% performance improvement, with an extremely high safety profile. It’s not a magic potion, but when you’ve already built a solid foundation of training, nutrition, and recovery, that extra 1-3% could be exactly what you need to break your personal best.

Related Reading

• The Mechanisms Behind Beetroot Juice Improving Cycling Performance: The Power of Nitric Oxide
• Beetroot Juice and Nitrate: A Scientifically Validated Natural Performance Enhancer
• The Exercise Science of Nitrate and Beetroot: The Nitric Oxide Pathway, Endurance Effect Sizes, and Dosing Timing Fully Explained
• The Science of Beetroot Juice: Can Nitrate Supplementation Really Boost Endurance