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BCAAs

Branched-chain amino acids. Largely redundant when total protein intake is adequate.

Supplements

Fitness & muscle

Research records

Historical source snapshot. Not freshly verified, not a recommendation. Study findings, community accounts and app defaults are not interchangeable.

Publication suitability · 2026-10-15: Historical reference only; not a clinical verification. Clinical, regulatory, efficacy, safety and dose claims are not independently established by this review.

BCAAs

Branched-chain amino acids. Largely redundant when total protein intake is adequate.

Evidence category: Systematic review. This describes the source category, not approval or certainty.

Regulatory statement in source: Not separately recorded; do not infer approval from the evidence category.

A meta-analysis of 18 randomised trials found branched-chain amino acids lowered creatine kinase at some time points and reduced muscle soreness over the days after damaging exercise, with no effect on lactate dehydrogenase. A systematic review of 22 trials with 511 healthy participants found soreness may fall, but effects on strength, endurance and body composition were inconsistent, and no meta-analysis was possible because of bias risk. In liver cirrhosis, a meta-analysis of five trials with 434 patients found a better frailty index, body mass index and quality of life, but no change in grip strength or muscle index.

Benefits reported in the imported source

  • Pooled randomised trials found less muscle soreness and lower creatine kinase after hard exercise.
  • In liver cirrhosis, pooled trials found a better frailty index, body mass index and quality of life.

Risks and limits

  • Effects on strength, endurance and body composition were inconsistent across trials.
  • One review could not pool its studies at all because of bias risk.
  • Grip strength and muscle index did not change in cirrhosis; lactate dehydrogenase was unchanged.

Source bottom line: BCAAs reduced post-exercise soreness in pooled trials, with inconsistent effects on strength, endurance and body shape.

Uncertainty: Reference information only. Not medical advice.

Study protocols — reports, not instructions

participants undergoing exercise-induced muscle damage across 18 randomised trials

Reported regimen
branched-chain amino acids 3.15-29.3 g a day (0.08-0.54 g/kg), given before, on the day of, or after the damaging exercise
Duration
1 to 28 days
Reported outcome
Creatine kinase fell immediately after exercise and at 72 h and soreness fell at 24, 48, 72 and 96 h; lactate dehydrogenase did not change at any point.
Source
Attenuating Muscle Damage Biomarkers and Muscle Soreness After an Exercise-Induced Muscle Damage with Branched-Chain Amino Acid (BCAA) Supplementation: A Systematic Review and Meta-analysis with Meta-regression (availability check 2026-10-15: possible access barrier; not independently inspected; HTTP 200)
Claim provenance

evidence.json#/catalog:supplement:bcaa/protocols/0

511 healthy participants across 22 randomised trials, 11 of them in trained athletes

Reported regimen
branched-chain amino acids 1.5-82 g a day, most often in a 2:1:1 leucine to isoleucine to valine ratio
Duration
one day to six months
Reported outcome
Soreness fell in 5 of 11 studies, strength improved in 8 of 16, endurance in 7 of 10, and body composition in only 1 of 5; no meta-analysis was possible.
Source
The Effect of Oral Pure Branched-Chain Amino Acid Supplementation on Exercise Performance and Body Composition: A Systematic Review
Claim provenance

evidence.json#/catalog:supplement:bcaa/protocols/1

Community and practice descriptions

Accounts of a practice are not evidence of safety or effectiveness. Words such as “standard”, “safe” or “recommended” describe the source account, not verified consensus or this wiki’s advice. Commercial and self-published citations are retained for traceability, not vendor endorsement or independent clinical corroboration.

Historical research outcome: no-verified-description · 2026-10-06

No suitable community description was independently verified in these checks. The entry remains empty; this does not establish that no practice exists elsewhere.

Pharmacokinetic context

No half-life recorded in this source snapshot. No value has been inferred.

Source references

Snapshot provenance

Source ID: catalog:supplement:bcaa. Commit: adc7684614f9439b41d91a3312b62e7982c7e20e. Review state: historical-not-reverified. Authored links are retained separately from the canonical evidence links in the public data. App templates/defaults and rejected drafts are archived, not deployed.

Related entries and components

None listed.