Beta-alanine
Beta-alanine powder or capsules; sustained-release formulations (e.g. CarnoSyn SR) if tingling is a problem
Strong
Several good studies agree
40 studies, 1461 participants, 70 outcome measures in one BJSM meta-analysis, replicated by an earlier Amino Acids meta-analysis and endorsed by an ISSN position stand — all agreeing on direction, magnitude and the duration window. Effect is small, but the evidence is not.
A small but dependable boost (about 3%) in hard efforts lasting 30 seconds to 10 minutes. It does nothing for efforts shorter than that.
Small but reliable ergogenic effect on high-intensity work (overall ES 0.18, 95% CI 0.08 to 0.28; median 2.85% improvement), concentrated in efforts lasting 0.5–10 min (ES 0.224, 95% CI 0.088 to 0.361) and absent under 30 seconds.
Beta-alanine is the rate-limiting precursor of muscle carnosine, an intracellular H⁺ buffer. Raising carnosine delays the pH fall that limits glycolytic power, which is why the benefit sits in the 30 s–10 min window and disappears in sub-30-second efforts where pH is not yet limiting.
Anyone whose limiter is repeated 1–4 min efforts: rowers, 800–1500 m runners, CrossFit, team-sport repeated sprints. Vegetarians and vegans start with lower muscle carnosine and plausibly gain more. Not useful for pure strength or single short sprints.
What to buy
- ✓Beta-alanine powder or capsules; sustained-release formulations (e.g. CarnoSyn SR) if tingling is a problem
- ✓4–6 g/day for at least 2–4 weeks (cumulative load matters more than daily dose); split into servings of ≤1.6 g to stay under the paraesthesia threshold
- ✓Third-party tested (USP, NSF, Informed Sport)
- ✕Proprietary blends that hide the dose per ingredient
- ✕Unstandardised extracts with no active-compound percentage
- · Paraesthesia (skin tingling on face, neck and hands) above ~800 mg in a single non-sustained-release dose — harmless but uncomfortable; use divided 1.6 g doses or a SR formula
- · No other adverse effects identified in the ISSN review at recommended doses; long-term (>1 year) data are limited
- · Theoretical taurine depletion via shared transporter has not been confirmed in humans
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Powder lets you split the daily 4–6 g into servings of 1.6 g or less, which is what keeps the skin tingling away. Capsules make that split tedious.
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The smaller tub, enough for the two-to-four week loading period before the effect appears. Beta-alanine works on cumulative load, not on the dose you took today.
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Eleven thousand ratings, the most-reviewed beta-alanine here, and each batch has a certificate of analysis you can actually pull up.
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See all on AmazonEvery result, next to the line that means no effect
Each diamond is a study's best estimate. The thin line shows how sure the study was: the shorter the line, the more certain the result.
- Overall exercise capacity/performanceeffect size · Saunders et al., BJSM 2017+0.18+0.08 … +0.28
- Efforts lasting 0.5–10 mineffect size · Saunders et al., BJSM 2017+0.22+0.09 … +0.36
- Efforts under 30 seffect size (null) · Saunders et al., BJSM 2017 — no benefit+0.04−0.22 … +0.30
- Median performance improvement% vs placebo · Hobson et al., Amino Acids 2012 (range −0.37 to +10.49%)+2.85[not given]
Each unit gets its own scale, so numbers are never mixed on one line. When a study gave no range, we leave it blank instead of inventing one.
3 studies over 5 years
The studies
- 1.β-alanine supplementation to improve exercise capacity and performance: a systematic review and meta-analysisBritish Journal of Sports Medicine · 2017 · meta-analysis · 40 experiments · n = 1,461
Overall ES 0.18 (95% CI 0.08–0.28) across 65 protocols and 70 measures; 0.5–10 min ES 0.224 (0.088–0.361); <0.5 min ES 0.040 (−0.220 to 0.300, null).
- 2.Effects of β-alanine supplementation on exercise performance: a meta-analysisAmino Acids · 2012 · meta-analysis · 15 experiments · n = 360
Median 2.85% improvement vs placebo (median cumulative dose 179 g); significant for 60–240 s (p=0.001) and >240 s (p=0.046), no benefit under 60 s (p=0.312).
- 3.International society of sports nutrition position stand: Beta-AlanineJournal of the International Society of Sports Nutrition · 2015 · systematic review
4–6 g/day for 2–4 weeks raises muscle carnosine 20–30% (40–60% with continued loading); paraesthesia above 800 mg per non-SR dose, mitigated by 1.6 g divided doses; safe at recommended doses in healthy adults.
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These statements have not been evaluated by the Food and Drug Administration.