REF-907 · Trexler et al., 2015 · Journal of the International Society of Sports Nutrition, Vol. 12, article · Paper · PubMed

International society of sports nutrition position stand: Beta-Alanine

Astrong evidenceMeasured on a mixed groupWritten before October 2026, being re-checked

The International Society of Sports Nutrition reviewed the mechanisms and use of beta-alanine. Four weeks at 4-6 g daily raises muscle carnosine, which acts as an intracellular pH buffer.

At recommended doses it appears safe in healthy people; the only reported side effect is paraesthesia (tingling), which divided lower doses (1.6 g) or a sustained-release formula can attenuate. Daily 4 to 6 g for at least 2 to 4 weeks improves exercise performance, with more pronounced effects in open end-point tasks or time trials lasting 1 to 4 min.

It attenuates neuromuscular fatigue, particularly in older subjects. Combining it with other supplements may help when the dose (4-6 g daily) and duration (minimum 4 weeks) are high enough. Effects on strength, on endurance performance beyond 25 min and on carnosine-related health outcomes need more research.

Participants

Not applicable (position stand). Written by an author panel for the ISSN.

Protocol

Objective and critical review of the available literature on beta-alanine mechanisms and supplementation; conclusions stated as seven numbered points.

Key Results

Loading: four weeks of 4-6 g daily significantly augments muscle carnosine concentrations, which act as an intracellular pH buffer.
Safety: appears safe in healthy populations at recommended doses.
Side effect: paraesthesia (tingling) is the only one reported; divided lower doses (1.6 g) or a sustained-release formula can attenuate it.
Performance: 4 to 6 g daily for at least 2 to 4 weeks improves exercise performance, more pronounced in open end-point tasks/time trials lasting 1 to 4 min.
Fatigue: attenuates neuromuscular fatigue, particularly in older subjects; preliminary evidence for tactical performance.
Stacking: combining with other single or multi-ingredient supplements may be advantageous when beta-alanine is high enough (4-6 g daily) and long enough (minimum 4 weeks).
Open questions: strength, endurance performance beyond 25 min, and health benefits of carnosine.

Practical Application

"Is beta-alanine worth taking, and how?" The ISSN position stand (Trexler 2015, A) says 4 to 6 g a day for at least 2 to 4 weeks improves performance, most clearly in all-out efforts of 1 to 4 min; split it into doses of about 1.6 g (or use a sustained-release product) to limit the tingling. It is a loading supplement, not a pre-race one.
For events longer than about 25 min the stand says the effect is not established — do not sell it to a marathoner or a long-course triathlete as a performance aid.
Not from this paper: the later meta-analysis (REF-351, A) found the benefit mainly in capacity (time-to-exhaustion) tests and only a small, uncertain one in time-trial performance, so expect less in a real race than the stand's wording suggests.
Not from this paper: the supplement decision framework is SYNTH-67; the buffer it is most often combined with is sodium bicarbonate (REF-354).

Limitations

A position stand from one society; conclusions are narrative, without pooled effect sizes or a stated search method in the abstract.
The performance window (1 to 4 min) and the dose are from the reviewed trials; endurance beyond 25 min is explicitly unresolved.
Several authors work in the supplement industry (affiliations listed on the record).
Written from the abstract and record metadata only (full text not read).
How this entry was checked and changed
Why this level

major position stand from a sports-nutrition society; a critical review, not a meta-analysis, so it gives dose and duration windows rather than pooled effect sizes