Does Beta-Alanine Improve Running Performance? Science Explained

🧠Article Difficulty: Easy / Moderate
🕒8 minute read

If you are a runner looking to gain those extra few percent of performance, this article is for you.

Beta-alanine is a common ingredient in the supplement industry, found in products such as pre-workout formulas, yet it is rarely discussed in the context of running or endurance sport performance. Based on the strength of the current evidence, I suspect that will change in the years ahead, and this article will show you why.

This article examines and summarizes the current research on beta-alanine supplementation and its effects on running performance, giving you a clear picture of the latest performance science so you can decide whether it is worth adding to your routine.

Article Summary

Scientific research has demonstrated the following running performance effects from beta-alanine supplementation:

▸An increase in the heart rate at which OBLA occurs of 7.4% (162 to 174 bpm), indicating runners could sustain a higher work output before hitting their lactate threshold.

▸A 2.09% greater improvement in 800 m time compared to placebo (3.05 seconds).

▸A 5.2% greater improvement in 10 km time compared to placebo (178 seconds), with lower blood lactate levels indicating better acidity clearance. 

▸A 5.1% greater improvement in time to exhaustion compared to placebo, with a 4% reduction in heart rate and respiratory effort during submaximal running, suggesting improved running efficiency.

Article

What is beta-alanine and how does it work?

Beta-alanine is an amino acid, one of the building blocks your body uses to make proteins. Your body produces it naturally, and it can also be found in small amounts in foods like chicken, beef, and fish. However, to get a meaningful performance benefit, supplementation is necessary.

When you exercise intensely, your muscles produce acid as a byproduct of generating energy. This acid builds up and causes that burning sensation in your muscles, negatively impacting their function and ultimately forcing you to slow down. Your body has systems to neutralize this acid, one of which relies on a molecule called carnosine. Carnosine binds to and neutralizes the hydrogen ions responsible for the rise in acidity. Think of it like an antacid settling your stomach, but for your muscles. Beta-alanine supplementation increases carnosine levels in the muscles, meaning more acid is neutralized during exercise and fatigue is delayed, allowing you to work harder and longer before performance begins to decline.

For a more detailed explanation of the physiology of beta-alanine, read this article.

The remainder of this article examines the specific research on running performance to give a practical sense of how much beta-alanine may improve your results.

While study data on beta-alanine for running performance is more limited than in weight training, I identified four high-quality studies conducted over the past 16 years. Each is presented below in chronological order and clearly summarized.

Study #1 (2010)

Research into beta-alanine's effect on running performance is still relatively new, with one of the first major studies published in 2010.

This initial study looked at whether beta-alanine supplementation could help runners go harder for longer before being limited by fatigue. Seventeen recreational male runners were split into two groups: one took beta-alanine (6.0 g/day) and the other took a placebo. Both groups completed treadmill tests before and after 28 days to measure how their bodies responded to increasing running intensity.

The main finding was that the beta-alanine group could run at a significantly higher intensity before hitting the point where acid builds up rapidly in the muscles, a threshold known as OBLA. Specifically, their heart rate at that threshold increased from around 162 to 174 bpm (7.4%), which means they were able to work at a higher percentage of their aerobic capacity before fatiguing. The placebo group saw almost no change.

Importantly, their overall aerobic fitness (VO2max) did not improve, which tells us the benefit came specifically from the muscles being better at clearing acid buildup. When muscles accumulate acid too quickly, they fatigue and work output decreases, so better acid clearance means a runner can sustain a higher workload (i.e. run faster or longer) before that happens.

This study was significant as one of the first to show that beta-alanine supplementation can meaningfully delay fatigue during running. By confirming that the supplement works by improving the muscles' ability to clear acid buildup, it laid the groundwork for more targeted research into its specific effects on running performance.

Study summary: Beta-alanine increased participants' heart rate at which OBLA occurred by 7.4% (162 to 174 bpm), indicating runners could sustain a higher work output before hitting their lactate threshold.

Study available here

Study #2 (2013)

The next study looked specifically at 800 m running performance. Eighteen male recreational runners were timed before and after 28 days of beta-alanine supplementation. Nine were given beta-alanine dosed at 80 mg per kg of body mass per day (roughly 4.8 g for a 60 kg individual and 6.2 g for an 80 kg individual), while nine were given a placebo. Participants were instructed to maintain their normal training habits throughout, and the researchers monitored this to confirm there were no differences in training load between the two groups.

The beta-alanine group improved their 800 m time by an average of 2.46% (3.64 seconds), while the placebo group improved by just 0.37% (0.59 seconds). The authors concluded that beta-alanine produced a significant performance improvement compared to placebo.

Study summary: Beta-alanine supplementation yielded a 2.09% greater improvement in 800 m time compared to placebo (3.05 seconds).

Study available here

Study #3 (2018)

The next study, published in 2018, was notable for examining 10 km running performance. Beta-alanine has traditionally been studied in the context of shorter efforts lasting 90 to 120 seconds, as this is where anaerobic glycolysis (the energy system responsible for acid buildup) contributes most to energy production. In reality, however, all three energy systems work alongside each other rather than in isolation, so it follows logically that beta-alanine's acid-reducing effects could benefit longer efforts too, which is what motivated this study. (Don't worry if you've not come across energy systems before, I am currently writing an article explaining how they work as this is essential physiology for any athlete. In the meantime, check out our article on how beta-alanine works which covers the basics.)

In this study, sixteen active adults were randomly split into two groups: one took 5 g of beta-alanine per day and the other took a placebo for 23 days. All participants followed the same training program three times per week, consisting of a 7 km run, sprint intervals, and a 12 km run. After 23 days, only the beta-alanine group showed a meaningful improvement in 10 km time, dropping by an average of 232 seconds (roughly 6.7%), compared to just 54 seconds (around 1.5%) in the placebo group. The beta-alanine group also had lower blood lactate levels after the run, indicating better acidity clearance.

This study is particularly significant in the context of running performance, as it demonstrates that beta-alanine's benefits are not limited to short-distance running but extend to longer distance running as well.

Study summary: Beta-alanine supplementation yielded a 5.2% greater improvement in 10 km time compared to placebo (178 seconds), with lower blood lactate levels indicating better acidity clearance.

Study available here

Study #4 (2025)

The most recent study, published in 2025, expanded on previous research by examining whether beta-alanine can improve time to exhaustion, meaning how long a runner can sustain a high-intensity pace before being forced to stop due to fatigue. Time to exhaustion was measured on a treadmill that started at a set speed and increased by 1 km/h every minute until the runner could no longer keep up, with total duration serving as the time to exhaustion score.

Twenty-seven adolescent middle- and long-distance runners were randomly assigned to either a beta-alanine group or a placebo group and completed treadmill tests at three points: before supplementation, after 14 days, and after 28 days. While VO2max did not change meaningfully in either group, the beta-alanine group improved their time to exhaustion by approximately 6.5%, compared to just 1.4% in the placebo group, meaning they could sustain their effort for significantly longer before reaching exhaustion. During submaximal running, heart rate and respiratory effort decreased by around 4% in the beta-alanine group only, suggesting the runners were working more efficiently at the same pace.

Overall, the results reinforce the pattern seen in earlier studies: beta-alanine does not increase maximal aerobic capacity, but it can meaningfully improve endurance performance and running efficiency.

Study summary: Beta-alanine supplementation resulted in a 5.1% greater improvement in time to exhaustion compared to placebo, with a 4% reduction in heart rate and respiratory effort during submaximal running, suggesting improved running efficiency.

Study available here

No effect studies

I came across three studies which found no significant effect of beta-alanine on running performance, however, there are specific reasons for why this is. The first used 5-second sprints, which is far too short for beta-alanine to have any effect, as there is no meaningful muscle acid buildup in that time frame.

The second used 35 m sprints and likewise found no effect. Together, these two studies suggest that beta-alanine does not improve sprint performance, which makes mechanistic sense given that its acid-reducing effects only become meaningful after roughly 30-120 seconds or more of higher-intensity exercise.

Finally, the third no effect study looked at 2-5 minute running intervals and found no effect, which appears to contradict the broader body of evidence. However, a closer look at the methods helps explain why. Most of the studies showing positive effects, measured running performance simply by recording time, with faster times or longer duration at a given pace indicating better performance. This study, however, used critical velocity as its primary outcome, which introduced unnecessary complexity. Critical velocity is derived through a multi-step process involving a graded exercise test, three separate time to exhaustion bouts, and a linear regression, meaning measurement error accumulates at each stage and reduces the sensitivity of the final estimate. This noise in the analytical approach may have been enough to mask any real effect entirely.

Summary

Given the strength of the literature showing positive effects of beta-alanine on running performance relative to the no-effect literature, the research is clear that beta-alanine supplementation can improve running performance. Given its widely researched safety and efficacy, beta-alanine is well worth adding to the arsenal of any endurance performer to improve intra-muscular acid clearance. 

Much like creatine monohydrate for strength and power performance, beta-alanine mechanisms are clear and grounded in basic physiology which is what makes this one of very few top-tier ergogenic supplements.

Thrive Beta-Alanine

At Thrive, we only produce and sell science-backed supplements that work, which is why this summer we are bringing beta-alanine to the product line. Like all Thrive products, our beta-alanine will be 100% clean label, fully third-party tested, and made in Ontario, Canada. Join our mailing list below to be notified when it launches. 

About the Author:

Joe is a certified trainer, strength and conditioning coach, and nutrition coach. He holds a Bachelor of Science with Honours in Sport and Exercise Science, graduating with First Class standing. During his studies, Joe focused on human physiology and performance, and he applies this knowledge of exercise science to his work with Thrive. Joe is the co-founder of Thrive Protein, a Canadian family-run supplement company focused on clean, scientifically backed nutrition products, including protein powders, greens, and electrolytes.