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Does Beta-Alanine Improve High-Intensity Exercise Performance?

Beta-alanine modestly improves high-intensity exercise lasting 30 seconds to 10 minutes, pooled trials show. Skin tingling is the main side effect.

Published October 2026

Short answer

Beta-alanine works modestly for high-intensity efforts lasting about 30 seconds to 10 minutes, especially tests of how long you can keep going. It does not help repeated sprints or body composition. Evidence grade B (Moderate). Meta-analyses of randomised trials totalling over 1,400 participants; downgraded one level for inconsistency across exercise types.

Key takeaways

  • Across 40 studies with 1,461 participants, beta-alanine gave a small overall benefit to exercise capacity and performance [1].
  • The benefit concentrates in efforts lasting 30 seconds to 10 minutes, and in tests of lasting longer rather than race-style time trials [1][2].
  • A 2026 meta-analysis of 17 trials found no improvement in repeated sprint performance [3].
  • Most trials used 4 to 6.4 g per day in split servings for at least 4 weeks [2][4].
  • Skin tingling is the only reported side effect, far more common with beta-alanine than placebo, with similar dropout rates [5].

The short version

Yes — beta-alanine modestly improves high-intensity exercise, according to pooled data from 40 double-blind, placebo-controlled studies with 1,461 participants [1]. The benefit shows up mainly in efforts lasting about 30 seconds to 10 minutes, and more in tests of how long you can keep going than in race-style time trials [1][2]. The main side effect is skin tingling [5].

What the studies show

Beta-alanine is an amino acid the body uses to build carnosine in muscle, and carnosine helps buffer the acid that builds up during hard exercise [2]. In the largest pooled analysis, 40 double-blind, placebo-controlled studies found a small overall benefit, with an effect size of 0.18 (95% CI 0.08 to 0.28) [1]. Exercise duration mattered: within efforts of 30 seconds to 10 minutes, tests of exercise capacity (lasting longer before exhaustion) improved clearly (effect size 0.50; 95% CI 0.25 to 0.75), while race-style performance tests barely moved (effect size 0.11; 95% CI -0.20 to 0.42) [1].

A 2024 review limited to trained young men (18 studies, 331 participants, efforts of 30 seconds to 10 minutes) found an effect size of 0.39 in favour of beta-alanine, strongest for 4 to 10 minutes of maximal effort (effect size 0.55) [2]. Pooling individual data from high-intensity cycling tests, beta-alanine added about 7.7 seconds to time to exhaustion and raised muscle carnosine by 18.1 mmol per kg of dry muscle [6]. In women, a 2026 review of 11 trials (312 women) found longer time to exhaustion (standardised mean difference 0.49), though the authors rated the certainty of the evidence very low because the evidence base is small [7].

Individual trials fit this pattern: 14 trained cyclists rode about 17.6 seconds longer before exhaustion after 4 weeks of 6.4 g per day, with a likely worthwhile gain in a 4 km time trial but no change over 1 or 10 km [8]. In 23 highly trained judo athletes, 4 weeks of 6.4 g per day increased the number of throws in fitness tests [9]. In 27 competitive middle- and long-distance runners, 28 days of beta-alanine raised time to exhaustion by 6.5% versus 1.4% with placebo, without changing aerobic capacity [10].

But the benefit has limits: 17 cyclists saw no sprint or 4 km time-trial gain after 28 days of 6.4 g per day, even though muscle carnosine rose [11]. Elite kayakers saw no change in 1,000 m or repeated-sprint rowing after 8 weeks [12]. Pooling 17 trials, a 2026 meta-analysis found no effect of beta-alanine on repeated sprint ability — not on average sprint output, peak sprint output or fatigue [3]. Nor does it change body composition: 20 trials with 492 participants found no change in body mass, fat mass, body-fat percentage or lean mass [13]. A review focused on efforts around the aerobic-anaerobic threshold found only small, uncertain effects on time trials and exhaustion tests [14].

The nuances

Dose and duration matter: benefits appeared from about 4 weeks at 5.6 to 6.4 g per day [2], and reviews find that splitting 4 to 6.4 g into smaller servings across the day more often produced strength and power gains [4]. Carnosine keeps building for months: in a 24-week trial of 6.4 g per day, muscle carnosine rose by about 11.4 mmol per kg at week 4 and about 20.2 by week 24, with better cycling capacity throughout [15]. Training alongside it may help: beta-alanine raised training intensity during a 5-week sprint-interval programme and added to gains in cycling to exhaustion [16]. Combining with sodium bicarbonate gave the largest effect in the big pooled analysis (effect size 0.43), and a review of 9 studies of the combination suggests it for high-intensity efforts of 30 seconds to 10 minutes [1][17]. In older adults (average age about 69), 5 small studies totalling 163 people suggest exercise capacity may improve at 2.4 to 3.2 g per day, but not strength [18]. The main side effect is skin tingling, much more common with beta-alanine than placebo, while dropout rates matched placebo and a small rise in one liver enzyme stayed within normal ranges [5]. See beta-alanine for full safety details.

What this means for you

The evidence best supports beta-alanine for sustained high-intensity efforts lasting roughly 30 seconds to 10 minutes — such as middle-distance swimming or rowing, combat sports and cycling capacity efforts [1][2]. It is unlikely to help single sprints, longer endurance events or body composition [3][8][13]. As with any supplement, people who are pregnant or breastfeeding, take regular medicines, or have kidney or liver conditions should talk to a doctor first.

Go deeper

  • Beta-Alanine — Beta-alanine modestly improves high-intensity exercise lasting about 30 seconds to 10 minutes, most clearly how long an effort can be sustained.

References

  1. β-alanine supplementation to improve exercise capacity and performance: a systematic review and meta-analysis.. Br J Sports Med, 2017.
  2. Effect of Beta-Alanine Supplementation on Maximal Intensity Exercise in Trained Young Male Individuals: A Systematic Review and Meta-Analysis.. Int J Sport Nutr Exerc Metab, 2024.
  3. No ergogeniceffect of β-alanine on repeated sprint ability: a systematic review and multilevel meta-analysis of randomized controlled trials.. Front Nutr, 2026.
  4. Dosing strategies for β-alanine supplementation in strength and power performance: a systematic review.. J Int Soc Sports Nutr, 2025.
  5. A Systematic Risk Assessment and Meta-Analysis on the Use of Oral β-Alanine Supplementation.. Adv Nutr, 2019.
  6. Individual Participant Data Meta-Analysis Provides No Evidence of Intervention Response Variation in Individuals Supplementing With Beta-Alanine.. Int J Sport Nutr Exerc Metab, 2021.
  7. Effects of beta-alanine supplementation on exercise performance and related physiological outcomes in women: a systematic review and meta-analysis.. Front Nutr, 2026.
  8. The effect of β-alanine supplementation on cycling time trials of different length.. Eur J Sport Sci, 2016.
  9. Beta-alanine supplementation enhances judo-related performance in highly-trained athletes.. J Sci Med Sport, 2017.
  10. Beta-alanine supplementation improves time to exhaustion, but not aerobic capacity, in competitive middle- and long-distance runners.. J Int Soc Sports Nutr, 2025.
  11. Beta-alanine did not improve high-intensity performance throughout simulated road cycling.. Eur J Sport Sci, 2022.
  12. No Effect of β-alanine on Muscle Function and Kayak Performance.. Med Sci Sports Exerc, 2018.
  13. Effects of beta-alanine supplementation on body composition: a GRADE-assessed systematic review and meta-analysis.. J Int Soc Sports Nutr, 2022.
  14. Effects of Beta-Alanine Supplementation on Physical Performance in Aerobic-Anaerobic Transition Zones: A Systematic Review and Meta-Analysis.. Nutrients, 2020.
  15. Twenty-four Weeks of β-Alanine Supplementation on Carnosine Content, Related Genes, and Exercise.. Med Sci Sports Exerc, 2017.
  16. Additive Benefits of β-Alanine Supplementation and Sprint-Interval Training.. Med Sci Sports Exerc, 2016.
  17. Effect of β-alanine and sodium bicarbonate co-supplementation on the body's buffering capacity and sports performance: A systematic review.. Crit Rev Food Sci Nutr, 2023.
  18. Beta-Alanine for Improving Exercise Capacity, Muscle Strength, and Functional Performance of Older Adults: A Systematic Review.. J Aging Phys Act, 2025.