What does the research show about beta-alanine?

Beta-alanine

Meta-analyses find beta-alanine taken daily for several weeks raises muscle carnosine and improves exercise lasting about 0.5 to 10 minutes by a small margin, effect size about 0.2 to 0.4. Exercise under 60 seconds, repeated sprints and body composition did not change. Tingling skin (paresthesia) was 8.9 times as likely as on placebo.

Add to Bio HackChecked 2026-11-09

Status: Dietary supplement in the US.
Also called: β-alanine, BA, CarnoSyn, carnosine precursor, pre-workout tingle
Taken for: high-intensity endurance, delaying fatigue, buffering lactic acid, interval training, muscle gain, body composition

Strong several reviews agree · Moderate one review or consistent trials · Limited one or a few small studies · Untested no study in people, listed with what it rests on

Shown to help3

StrongShown to improve high-intensity exercise lasting about 1 to 10 minutes, by a median of about 3%, more in capacity tests than in time trials.
ModerateShown to raise muscle carnosine at 4 to 6 g a day for 4 weeks, with nearly everyone responding in one lab's data.
LimitedLimited evidence: time to exhaustion improved in women, while other measures were imprecise, at very low certainty.

Reported risks2

StrongShown to raise skin tingling, about 9 times the odds on placebo. It was the only side effect reported across 101 studies.How often is not known
LimitedLimited evidence: ALT rose slightly but stayed within reference ranges, and muscle taurine did not change in humans.How often is not known

What people take it for, and what was found

Shown to help3

Strong

High-intensity exercise lasting about 1 to 10 minutes

Shown to improve high-intensity exercise lasting about 1 to 10 minutes, by a median of about 3%, more in capacity tests than in time trials.

The numbers and sources

Effect: Across 40 placebo-controlled studies (1,461 participants), the overall effect size was 0.18 (95% CI 0.08 to 0.28). Within efforts of 0.5 to 10 minutes, exercise capacity tests improved more (0.50, 95% CI 0.25 to 0.75) than performance tests (0.11, 95% CI -0.20 to 0.42) [1]. An earlier meta-analysis found improvement in exercise of 60 to 240 seconds and over 240 seconds, none under 60 seconds, and a median 2.85% improvement after a median total of 179 g [2]. In 331 trained young men, the effect size for maximal efforts of 0.5 to 10 minutes was 0.39 (95% CI 0.09 to 0.69) [3].
Population: Healthy trained and untrained people; mostly men [1][2][3].
Sources: [1], [2], [3]
Caveats: Capacity tests (time to exhaustion) move more than performance tests (time trials), and performance is closer to competition [1]. Training status and total dose did not moderate the effect [1].

Moderate

Muscle carnosine

Shown to raise muscle carnosine at 4 to 6 g a day for 4 weeks, with nearly everyone responding in one lab's data.

The numbers and sources

Effect: A dose-response meta-analysis found muscle carnosine rises in a non-linear way and that common protocols may not approach saturation. In 99 individuals from one lab, 99.3% responded (95% CrI 96.2 to 100) [4]. The ISSN position stand reports that 4 to 6 g a day for 4 weeks raised muscle carnosine [5].
Population: Human muscle biopsy studies [4].
Sources: [4], [5]
Caveats: Carnosine is the mechanism, not a performance outcome. The individual data come from the authors' own lab [4]. Reference [5] is an ISSN position stand, a narrative consensus.

LimitedStudied in women

Performance in women

Limited evidence: time to exhaustion improved in women, while other measures were imprecise, at very low certainty.

The numbers and sources

Effect: In 11 RCTs (312 women), time to exhaustion improved (8 studies, SMD 0.49, 95% CI 0.20 to 0.79). Pooled estimates for peak power, anaerobic performance, VO2max and body fat were imprecise [6].
Population: Women only [6].
Sources: [6]
Caveats: GRADE certainty was very low for all outcomes [6].

Not shown to help2

Moderate

Body composition and muscle gain

Not shown to change body mass, fat mass or fat-free mass in adults in training, across 20 trials.

The numbers and sources

Effect: Across 20 RCTs (492 participants), beta-alanine did not change body mass (-0.15 kg, 95% CI -0.78 to 0.47), fat mass (-0.24 kg, 95% CI -1.16 to 0.68), body fat percentage (-0.06%) or fat-free mass (0.05 kg, 95% CI -0.71 to 0.82). Results were the same across training type, duration and dose [7].
Population: Adults in resistance, endurance or combined training [7].
Sources: [7]
Caveats: Certainty ranged from low to moderate. The authors report no funding [7].

Moderate

Repeated sprints

Not shown to change repeated sprint performance or fatigue across 17 trials, at any dose or duration tested.

The numbers and sources

Effect: Across 17 RCTs, beta-alanine taken for 2 weeks or more did not change mean repeated sprint performance (SMD -0.018, 95% CI -0.207 to 0.170), peak repeated sprint performance (0.205, 95% CI -0.073 to 0.483) or fatigue decrement (-0.020, 95% CI -0.516 to 0.476). Total dose, duration, exercise type and training status did not moderate the result [8].
Population: Healthy people in 17 placebo-controlled trials [8].
Sources: [8]
Caveats: One meta-analysis. The abstract does not report the pooled number of participants [8].

Doses studied

The ISSN position stand reports 4 to 6 g a day for at least 2 to 4 weeks in performance trials, with divided doses of 1.6 g or sustained-release forms used to reduce tingling [5]. In trained young men, effects appeared at 4 weeks and at 5.6 to 6.4 g a day [3]. The earlier meta-analysis reported a median total intake of 179 g across a trial [2]. Total amount ingested did not moderate effect size in the larger meta-analysis [1].

Risks

Reported risks1

StrongHow often is not known

Paresthesia (skin tingling)

Shown to raise skin tingling, about 9 times the odds on placebo. It was the only side effect reported across 101 studies.

The numbers and sources

How common: How often is not known: the sources give no rate.
Effect: Across 101 human studies, paresthesia was the only reported side effect, with an odds ratio of 8.9 (95% CrI 2.2 to 32.6) against placebo. Dropout rates were similar to placebo [9]. The ISSN stand also names paresthesia as the only reported side effect [5].
Population: Humans in acute and longitudinal trials [9].
Sources: [5], [9]
Caveats: Tingling also breaks blinding in trials, since participants can tell which group they are in.

Mixed results1

LimitedHow often is not known

Liver enzyme and muscle taurine changes

Limited evidence: ALT rose slightly but stayed within reference ranges, and muscle taurine did not change in humans.

The numbers and sources

How common: How often is not known: the sources give no rate.
Effect: Beta-alanine raised circulating alanine aminotransferase slightly (effect size 0.274, 95% CrI 0.04 to 0.527), with mean values within clinical reference ranges. Muscle taurine (0.156, 95% CrI -0.38 to 0.72) and histidine did not change in humans. Taurine fell in mice only at 3% or more beta-alanine in drinking water [9].
Population: 101 human and 50 animal studies [9].
Sources: [9]
Caveats: The abstract does not report trial durations. No trials of use over years were located.

Claims tested and not found

That beta-alanine improves short sprints or single lifts. Exercise under 60 seconds did not improve in pooled trials [2]. Repeated sprint performance did not change across 17 RCTs [8].
That beta-alanine builds muscle or reduces fat. Fat-free mass and fat mass did not change across 20 RCTs [7].

Sources

Saunders B, Elliott-Sale K, Artioli GG, et al. β-alanine supplementation to improve exercise capacity and performance: a systematic review and meta-analysis. British Journal of Sports Medicine. 2016. https://doi.org/10.1136/bjsports-2016-096396
Hobson RM, Saunders B, Ball G, et al. Effects of β-alanine supplementation on exercise performance: a meta-analysis. Amino Acids. 2012. https://doi.org/10.1007/s00726-011-1200-z
Georgiou GD, Antoniou K, Antoniou S, et al. Effect of Beta-Alanine Supplementation on Maximal Intensity Exercise in Trained Young Male Individuals: A Systematic Review and Meta-Analysis. International Journal of Sport Nutrition and Exercise Metabolism. 2024. https://doi.org/10.1123/ijsnem.2024-0027
Rezende NS, Swinton P, de Oliveira LF, et al. The Muscle Carnosine Response to Beta-Alanine Supplementation: A Systematic Review With Bayesian Individual and Aggregate Data E-Max Model and Meta-Analysis. Frontiers in Physiology. 2020. https://doi.org/10.3389/fphys.2020.00913
Trexler ET, Smith-Ryan AE, Stout JR, et al. International society of sports nutrition position stand: Beta-Alanine. Journal of the International Society of Sports Nutrition. 2015. https://doi.org/10.1186/s12970-015-0090-y
Gu J, Wei Y, Huang J, et al. Effects of beta-alanine supplementation on exercise performance and related physiological outcomes in women: a systematic review and meta-analysis. Frontiers in Nutrition. 2026. https://doi.org/10.3389/fnut.2026.1857513
Ashtary-Larky D, Bagheri R, Ghanavati M, et al. Effects of beta-alanine supplementation on body composition: a GRADE-assessed systematic review and meta-analysis. Journal of the International Society of Sports Nutrition. 2022. https://doi.org/10.1080/15502783.2022.2079384
Liang W, Kong D, Wang Y, et al. No ergogenic effect of β-alanine on repeated sprint ability: a systematic review and multilevel meta-analysis of randomized controlled trials. Frontiers in Nutrition. 2026. https://doi.org/10.3389/fnut.2026.1818755
Dolan E, Swinton PA, Painelli VdS, et al. A Systematic Risk Assessment and Meta-Analysis on the Use of Oral β-Alanine Supplementation. Advances in Nutrition. 2019. https://doi.org/10.1093/advances/nmy115

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