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Creatine vs Beta-Alanine — Trial Data

Creatine and Beta-Alanine are reported in separate bodies of trial evidence, through different mechanisms, for different exercise durations. This page reports the meta-analysis and RCT data behind each, attributed to its source, and notes where a commonly repeated figure could not be traced to a citation.

On this page
  1. 1.Mechanism
  2. 2.Creatine: Human Trial Evidence
  3. 3.Beta-Alanine: Human Trial Evidence
  4. 4.Adverse Events
  5. 5.Combined Supplementation
  6. 6.Evidence Level
  7. 7.FAQ
  8. 8.References

Mechanism

Creatine raises intramuscular phosphocreatine stores. For maximal-effort work under roughly 10 seconds, ATP is regenerated primarily from phosphocreatine; higher stores are reported to support faster ATP resynthesis during that window (Kreider et al. 2017, PMID 28615996).

Beta-alanine is the rate-limiting precursor for synthesis of carnosine, a dipeptide in skeletal muscle that buffers hydrogen ions produced during high-intensity exercise. Raising muscle carnosine is reported to extend the point at which acidosis contributes to fatigue during sustained high-intensity efforts (Trexler et al. 2015, PMID 26175657).

The two mechanisms are reported as independent: phosphocreatine resynthesis for short maximal efforts versus intracellular pH buffering for sustained high-intensity efforts.

Creatine: Human Trial Evidence

Lanhers et al. published two systematic reviews and meta-analyses in Sports Medicine pooling randomized, placebo-controlled trials of creatine and 1RM strength in exercises under three minutes.

Lower limb (2015, PMID 25946994): 60 studies, 646 creatine-group and 651 control participants. Global lower-limb effect size 0.235 (95% CI 0.125–0.346, P<0.001); squat 0.336 (95% CI 0.047–0.625); leg press 0.297 (95% CI 0.098–0.496); overall quadriceps 0.266.

Upper limb (2017, PMID 27328852): 53 studies, 563 creatine-group and 575 control participants. Global upper-limb effect size 0.317 (95% CI 0.185–0.449, P<0.001); chest press 0.677 (95% CI 0.149–1.206); bench press 0.265 (95% CI 0.132–0.398).

A separate 2026 meta-analysis in postmenopausal women (Naddafha et al., PMID 42141930; 7 RCTs, n=608) reported lean mass up 0.37 kg (95% CI 0.05–0.69) and leg-press 1RM up 7.5 kg (95% CI 2.2–12.8) when creatine was combined with resistance training. A 2014 meta-analysis in older adults (Devries & Phillips, PMID 24576864; 357 participants) found creatine plus resistance training increased chest-press (P=0.004) and leg-press (P=0.02) 1RM more than resistance training alone, with no significant added effect on knee-extension or biceps-curl 1RM.

None of these sources report a single pooled percentage figure for 1RM increase. A prior version of this page stated “~5–10% increases in 1RM” without a citation; that figure is not reproduced here because it could not be traced to a specific source.

Beta-Alanine: Human Trial Evidence

The International Society of Sports Nutrition position stand (Trexler et al. 2015, PMID 26175657) concludes that four weeks of beta-alanine at 4–6 g/day significantly raises muscle carnosine, acting as an intracellular pH buffer, and reports the supplementation as safe in healthy populations at recommended doses, with paraesthesia the only reported side effect.

A 2024 systematic review and meta-analysis in trained young men (Georgiou et al., PMID 39032921; 18 studies, 15 outcome measures, 331 participants) found a significant overall effect on maximal- or supramaximal-intensity exercise lasting 0.5–10 minutes (effect size 0.39, 95% CI 0.09–0.69, P=.01). The effect was strongest at 4–10 minutes of effort (effect size 0.55, 95% CI 0.07–1.04) and at a dose of 5.6–6.4 g/day (effect size 0.35, 95% CI 0.09–0.62).

A separate 2026 multilevel meta-analysis (Liang et al., PMID 41971372) reported no ergogenic effect of beta-alanine specifically on repeated sprint ability — a shorter, different exercise pattern than the sustained maximal-intensity efforts covered by the Georgiou meta-analysis. The two findings are not in conflict; they cover different exercise durations.

CreatineBeta-Alanine
Primary MechanismRaises intramuscular phosphocreatine stores, speeding ATP (adenosine triphosphate — the energy currency muscle cells use for contraction) resynthesis during short, maximal-effort workRaises muscle carnosine (a dipeptide that buffers hydrogen ions produced during intense exercise); beta-alanine is the rate-limiting precursor for its synthesis
Reported ForStrength and short maximal efforts under ~10 secondsMaximal-intensity efforts in the 0.5–10 minute range; no effect shown on repeated sprint ability under 30 seconds
Evidence BaseLarge human RCT literature; ISSN position stand (Kreider et al. 2017, PMID 28615996)ISSN position stand (Trexler et al. 2015, PMID 26175657); multiple exercise-performance meta-analyses
Strength/Performance Effect (quantified)Lower-limb ES 0.235–0.336, upper-limb ES 0.265–0.677 across meta-analyses (Lanhers et al. 2015/2017)Overall effect size 0.39 (95% CI 0.09–0.69) on maximal-intensity exercise in trained young men (Georgiou et al. 2024)
Reported Adverse EffectNone identified as a distinct adverse effect in the cited meta-analyses; original manufacturer/trial safety data reviewed in Kreider et al. 2017Paraesthesia (skin tingling), reported as the only consistent side effect in the ISSN position stand
Dose Studied3–5 g/day maintenance, or a 20 g/day loading protocol for 5–7 days (Kreider et al. 2017)4–6 g/day for at least 4 weeks to raise muscle carnosine (Trexler et al. 2015); divided doses of ~1.6 g reduce paraesthesia
Time to Effect (as reported)Muscle creatine saturation and strength changes measured from 2–4 weeks in RCTsCarnosine elevation measured over 4–10 weeks of consistent dosing in loading studies

Adverse Events

Creatine: the ISSN position stand (Kreider et al. 2017, PMID 28615996) reviews creatine's safety data across a large trial literature and does not identify a consistent adverse-event signal distinct from the mechanism-related intracellular water shift. A specific figure for water-retention magnitude (e.g., a pound range) was not located in the sources reviewed for this page and is not reproduced here.

Beta-alanine: paraesthesia (tingling in the face, hands, or scalp) is reported as the only consistent side effect (Trexler et al. 2015, PMID 26175657). The same position stand reports that divided lower doses (around 1.6 g at a time) or sustained-release formulations reduce the intensity of tingling.

Combined Supplementation

Creatine and beta-alanine act on separate mechanisms — phosphocreatine-driven ATP resynthesis versus carnosine-mediated pH buffering — and are frequently studied or used together in the sports-nutrition literature. No trial reviewed for this page directly quantified an additive or synergistic effect of combined supplementation on a shared outcome measure; the case for combining them rests on the two mechanisms being reported as independent rather than on a head-to-head combination trial.

Evidence Level

CreatineBeta-Alanine
LevelHuman RCT (multiple meta-analyses)Human RCT (multiple meta-analyses)
BasisLanhers et al. 2015/2017 (PMID 25946994, 27328852); ISSN position stand (PMID 28615996)ISSN position stand (PMID 26175657); Georgiou et al. 2024 (PMID 39032921)

The creatine and beta-alanine trials cited above were conducted in different populations, exercise protocols, and durations, and are not head-to-head comparisons of the two compounds. Effect sizes across meta-analyses on the same compound also vary by population and outcome measure and should not be treated as a single fixed number.

FAQ

What does the human trial evidence show for creatine and 1RM strength?

Two 2015–2017 systematic reviews and meta-analyses by Lanhers et al. (Sports Medicine) pooled randomized, placebo-controlled trials measuring one-repetition-maximum (1RM) strength for exercises under three minutes. The lower-limb analysis (PMID 25946994; 60 studies, 646 creatine vs. 651 control participants) found a global lower-limb effect size of 0.235 (95% CI 0.125–0.346, P<0.001), with squat at 0.336 and leg press at 0.297. The upper-limb analysis (PMID 27328852; 53 studies, 563 vs. 575 participants) found a global upper-limb effect size of 0.317 (95% CI 0.185–0.449, P<0.001), with chest press at 0.677 and bench press at 0.265. These are standardized effect sizes (Cohen's d), not percentage changes in 1RM — the source studies do not report a single pooled percentage figure.

Is there a documented percentage increase in 1RM from creatine, like "5–10%"?

No single trial or meta-analysis reviewed for this page reports a pooled percentage increase in 1RM. The Lanhers et al. meta-analyses (PMID 25946994, PMID 27328852) report standardized effect sizes, not percentages, and a separate 2026 meta-analysis in postmenopausal women (Naddafha et al., PMID 42141930) reports absolute kilogram changes — leg-press 1RM up 7.5 kg (95% CI 2.2–12.8) — not a percentage. A prior version of this page stated “~5–10% increases in 1RM” without a citation; that figure has been removed because it could not be traced to a specific source.

Does creatine cause water retention, and by how much?

Creatine draws water into muscle cells as part of its mechanism (intracellular, not subcutaneous). A prior version of this page cited “1–3 lbs water retention” without a source; no specific figure for that range was located in the trials reviewed for this page, so it has been removed rather than repeated. The Kreider et al. 2017 ISSN position stand (PMID 28615996) reviews creatine's safety literature broadly but is not cited here for a specific water-retention figure.

What does the trial evidence show for beta-alanine and performance?

The 2015 ISSN position stand (Trexler et al., PMID 26175657) concludes that 4 weeks of beta-alanine at 4–6 g/day significantly raises muscle carnosine and is safe in healthy populations, with paraesthesia (tingling) the only reported side effect. A 2024 meta-analysis in trained young men (Georgiou et al., PMID 39032921; 18 studies, 331 participants) found a significant overall effect on maximal-intensity exercise (effect size 0.39, 95% CI 0.09–0.69, P=.01), strongest at 4–10 minutes of effort (effect size 0.55) and at 5.6–6.4 g/day dosing (effect size 0.35). A separate 2026 meta-analysis (Liang et al., PMID 41971372) found no ergogenic effect specifically on repeated sprint ability, a shorter and different exercise pattern than the maximal-intensity efforts in the Georgiou analysis.

How safe are creatine and beta-alanine, long-term?

Both have extensive human trial safety records reviewed in their respective ISSN position stands (creatine: Kreider et al. 2017, PMID 28615996; beta-alanine: Trexler et al. 2015, PMID 26175657). A prior version of this page stated creatine has “30+ years of human safety data”; that specific duration figure could not be traced to a citation and has been removed. The position stands themselves remain the sourced basis for describing both compounds' safety profiles in healthy adults.

References

  1. Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18. https://pubmed.ncbi.nlm.nih.gov/28615996/
  2. Lanhers C, Pereira B, Naughton G, et al. Creatine Supplementation and Lower Limb Strength Performance: A Systematic Review and Meta-Analyses. Sports Med. 2015;45(9):1285-1294. https://pubmed.ncbi.nlm.nih.gov/25946994/
  3. Lanhers C, Pereira B, Naughton G, et al. Creatine Supplementation and Upper Limb Strength Performance: A Systematic Review and Meta-Analysis. Sports Med. 2017;47(1):163-173. https://pubmed.ncbi.nlm.nih.gov/27328852/
  4. Naddafha S, Antonio J, Kreider RB, Stout JR. Creatine monohydrate for lean mass, strength, and bone density in postmenopausal women: a systematic review and meta-analysis. J Int Soc Sports Nutr. 2026;23(1):2668435. https://pubmed.ncbi.nlm.nih.gov/42141930/
  5. Devries MC, Phillips SM. Creatine supplementation during resistance training in older adults-a meta-analysis. Med Sci Sports Exerc. 2014;46(6):1194-1203. https://pubmed.ncbi.nlm.nih.gov/24576864/
  6. Trexler ET, Smith-Ryan AE, Stout JR, et al. International society of sports nutrition position stand: Beta-Alanine. J Int Soc Sports Nutr. 2015;12:30. https://pubmed.ncbi.nlm.nih.gov/26175657/
  7. 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. Int J Sport Nutr Exerc Metab. 2024;34(6):397-412. https://pubmed.ncbi.nlm.nih.gov/39032921/
  8. 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. Front Nutr. 2026;13:1818755. https://pubmed.ncbi.nlm.nih.gov/41971372/
Creatine ProfileBeta-Alanine Profile

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