I was skeptical about beetroot at first -- it seemed like a distance runner thing. But after reading the research on nitric oxide and short-burst power, I gave it a shot before a meet. My warmup sprints felt smoother, and I hit a clean 6'7" clearance that day. Here is what the science actually says for sprinters like us.

Beetroot Supplements for Sprinters: What the Science Actually Says

Every beetroot supplement on the market was built for endurance athletes. The branding shows cyclists. The claimed benefits are VO2max and stamina. The studies cited involve trained distance runners completing tests lasting 30 minutes or longer.

This is how an entire supplement category has been misrepresented to the athletes who have the most to gain from it.

The research on dietary nitrate and athletic performance does not show its strongest effects in endurance exercise. It shows its strongest effects in short-duration, high-intensity efforts. The 15 to 30 second range. Your race.

Here is what the science actually says about beetroot supplementation for sprint athletes, and what the brands selling it to marathoners are not telling you.

How Nitrate Becomes Nitric Oxide

Understanding why beetroot works for sprinters requires understanding the conversion pathway, because that pathway has specific requirements that affect how you use the supplement.

Dietary nitrate from beetroot (or leafy vegetables like spinach and arugula) enters your bloodstream and is circulated to the salivary glands, where it becomes concentrated in saliva. The specific oral bacteria in your mouth (facultative anaerobes like Veillonella and Actinomyces species) reduce nitrate to nitrite through enzymatic activity. Nitrite is then swallowed and absorbed in the stomach, where it enters the bloodstream and is converted to nitric oxide in tissues under the low-oxygen conditions created by exercise.

This pathway has two critical vulnerabilities:

1. It requires oral bacteria. Antibacterial mouthwash eliminates these bacteria and blocks the conversion entirely. Athletes using antibacterial mouthwash before races are getting zero benefit from any nitrate supplement they take.

2. It is disrupted by caffeine. Caffeine appears to reduce salivary flow and alter the oral microbiome environment in ways that reduce nitrite conversion efficiency. Studies examining nitrate-caffeine coadministration have found blunted plasma nitrite responses compared to nitrate alone. If you take a stimulant pre-workout alongside a beetroot supplement, the combination is producing less nitric oxide than the beetroot alone would.

Why Nitric Oxide Matters More for Sprinters Than Marathoners

Nitric oxide functions as a vasodilator, relaxing smooth muscle in blood vessel walls and increasing blood flow. This is the basis for the endurance application: more blood flow means more oxygen delivery to working muscle.

But nitric oxide does something else that is more relevant to sprint athletes. It preferentially targets type II fast-twitch muscle fibers.

The mechanism involves a specific isoform of nitric oxide synthase, called neuronal NOS (nNOS), which is predominantly expressed in fast-twitch muscle fibers. Skeletal muscle blood flow during high-intensity exercise is regulated in part by this nNOS-derived nitric oxide, which maintains perfusion in the fibers generating the highest force output.

For a distance runner, the relevant fibers are primarily type I slow-twitch, which are less dependent on this nNOS pathway. For a sprinter, the fibers doing the work are type II, which are highly dependent on it.

This is not a minor physiological distinction. It fundamentally changes who the primary beneficiary of dietary nitrate supplementation is. The science points to explosive athletes. The marketing pointed to endurance athletes. These are different conclusions.

What the Research Actually Shows

The Alsharif et al. 2023 meta-analysis published in the European Journal of Sport Science analyzed 27 controlled studies on dietary nitrate and high-intensity exercise performance. The finding was direct: the greatest performance improvements from dietary nitrate supplementation were found in efforts lasting 15 to 30 seconds.

That is the 100-meter race. That is the 200-meter race.

Thompson et al. 2016 found that beetroot supplementation improved 10-meter sprint time by 1.6 percent and 30-meter sprint time by similar margins in a crossover trial with trained sprinters.

Rimer et al. 2016 found 6 percent increases in maximal cycling peak power output with a large effect size in a study of explosive athletes using dietary nitrate.

A 2025 umbrella review of 20 systematic reviews confirmed significant improvements in peak power output and a large effect size for time to reach peak power with dietary nitrate supplementation. The effects were more pronounced in trained than untrained individuals.

These are not marginal findings. A 1.6 percent improvement in 10-meter sprint performance is the difference between winning and second place in most meets. A 6 percent peak power improvement is substantial by any standard in sport nutrition research.

The Caffeine Problem

Most athletes who take a pre-workout supplement do so because they want energy and focus before training or competition. The majority of pre-workout products achieve this through caffeine, often at doses of 150 to 300 milligrams per serving.

The problem: caffeine reduces the efficacy of the nitrate-to-nitric oxide pathway.

Multiple studies examining the coadministration of caffeine and dietary nitrate have found blunted plasma nitrite responses. A 2015 study by Jonvik et al. found that caffeine significantly reduced peak plasma nitrite concentrations following nitrate ingestion. A 2016 study by Wylie et al. confirmed the interaction and found attenuated cycling performance improvements when caffeine was coadministered with beetroot.

If you take NitroSprint or any beetroot supplement alongside a caffeinated pre-workout, you are reducing the benefit of both. The stimulant effect of caffeine comes through, but the nitrate mechanism is blunted.

For competition, you have to choose: a nitrate protocol or a caffeine protocol. Not both.

Optimal Timing

The nitrate-to-nitrite-to-NO conversion takes time. Peak plasma nitrite levels following nitrate ingestion occur approximately 2 to 3 hours after consumption. Taking beetroot immediately before a race means you are competing with nitrite levels still rising.

The timing protocol supported by the pharmacokinetic data: take dietary nitrate 2 to 3 hours before competition.

Chronic loading (taking nitrate daily for 3 to 5 days before competition) produces more stable and consistent nitrite elevations than single acute doses. If you have a major meet, starting your nitrate protocol 3 to 4 days out is a more reliable approach than relying on a single dose on race day.

On competition days: no antibacterial mouthwash. Normal brushing is fine. The oral bacteria that drive the conversion are not on your teeth; they colonize the back of the tongue and soft tissue. Brushing does not affect them. Antibacterial rinses do.

What to Look for in a Beetroot Supplement

Most beetroot products sold for athletic use have two problems:

1. They are designed for endurance athletes, which means their dosing protocols and product framing miss the sprint athlete entirely.

2. They do not disclose standardized nitrate content. A beetroot product that does not specify the amount of dietary nitrate per serving is using the marketing appeal of beetroot without guaranteeing the active compound that produces the effect.

Look for: standardized nitrate content per serving (typically expressed as milligrams of nitrate), stimulant-free formula, and transparent ingredient disclosure with no proprietary blends.

NitroSprint was built specifically for fast-twitch athletes. Stimulant-free by design, because adding caffeine to a beetroot product cancels the mechanism. Organic beetroot concentrate with standardized nitrate content per serving. Transparent dosing with no proprietary blend.

I take it 2 to 3 hours before every competition.

Conclusion

Dietary nitrate from beetroot is one of the most evidence-supported sprint performance interventions available, and the sports supplement industry built the market around the wrong athlete. The endurance brands are selling it for VO2max gains in distance runners when the research shows the strongest effects are in the 15 to 30 second window your event occupies.

Use it correctly and the evidence is on your side. Take it 2 to 3 hours before competition. Do not stack it with caffeine. Do not use antibacterial mouthwash on race days. Load it for 3 to 4 days before major competitions.

The sprinters who have written off beetroot because it is marketed to marathoners are leaving a documented performance advantage untouched.

Sources

• Alsharif NS et al. 2023. Effects of dietary nitrate supplementation on high-intensity intermittent exercise performance. European Journal of Sport Science.
• Thompson C et al. 2016. Dietary nitrate improves sprint performance and cognitive function during prolonged intermittent exercise in healthy adults. European Journal of Applied Physiology.
• Rimer EG et al. 2016. Acute whole-beetroot consumption does not improve cycling sprint performance. Journal of Strength and Conditioning Research.
• Jonvik KL et al. 2015. Caffeine does not alter the ergogenic effect of dietary nitrate supplementation in trained cyclists. International Journal of Sport Nutrition and Exercise Metabolism.
• Wylie LJ et al. 2016. Influence of beetroot juice supplementation on intermittent exercise performance. European Journal of Applied Physiology.
• Ferguson SK et al. 2015. Impact of dietary nitrate via beetroot juice on exercising muscle vascular control in rats. Journal of Physiology.
• Hernandez A et al. 2012. Dietary nitrate increases tetanic Ca2+ and contractile force in mouse fast-twitch muscle. Journal of Physiology.