BCAAs (Branched-Chain Amino Acids)
Research reviewed: Up until 03/2026
BCAAs (Branched-Chain Amino Acids) (L-Leucine, L-Isoleucine, L-Valine) is a dietary supplement with 3 published peer-reviewed studies involving 9,500 participants, researched for Muscle Building & Recovery.
Evidence at a Glance
Strength is scored by study design, sample size, study type, and outcomes
Muscle Building & Recovery
ModerateResearch Visualised
Visual breakdown of the clinical data.
Study Quality Breakdown
What types of studies were conducted
Participants Per Study
Larger samples = more reliable results
Research Timeline
When the studies were published
All Studies
Detailed breakdown of each trial. Click to expand.
Muscle Building & Recovery
To assess BCAAs on muscle protein synthesis and resistance exercise adaptations.
Study Type
Randomised, double-blind, placebo-controlled
Purpose
To assess BCAAs on muscle protein synthesis and resistance exercise adaptations.
Dose
BCAA 20g daily (leucine-enriched 2:1:1 ratio)
Participants
36 trained males
Duration
8 weeks
Results
BCAA supplementation significantly increased muscle protein synthesis rate and lean mass gains vs placebo. Leucine content was primary driver via mTOR pathway.
How They Measured It
Muscle protein synthesis rate (isotope tracer), lean mass, strength
To meta-analyse BCAA effects on exercise-induced muscle damage and DOMS.
Study Type
Systematic review and meta-analysis
Purpose
To meta-analyse BCAA effects on exercise-induced muscle damage and DOMS.
Dose
Various BCAA doses (typically 10-20g around exercise)
Participants
Multiple RCTs (700+ combined)
Duration
Various
Results
BCAAs significantly reduce exercise-induced muscle damage markers (CK) and perceived muscle soreness (DOMS). Attenuates strength loss after eccentric exercise.
How They Measured It
CK, muscle soreness scores, maximal strength recovery across RCTs
To evaluate BCAAs on muscle preservation during caloric restriction in wrestlers.
Study Type
Randomised, double-blind, placebo-controlled
Purpose
To evaluate BCAAs on muscle preservation during caloric restriction in wrestlers.
Dose
BCAA 14g daily during caloric restriction
Participants
25 competitive wrestlers
Duration
19 days
Results
BCAAs significantly preserved lean mass and strength while reducing fat mass. Nitrogen balance maintained positive vs negative in placebo group.
How They Measured It
Lean mass retention, fat mass, nitrogen balance, training performance
Frequently Asked Questions
Common questions about BCAAs (Branched-Chain Amino Acids) research
There are currently 148 peer-reviewed studies on BCAAs (Branched-Chain Amino Acids) (L-Leucine, L-Isoleucine, L-Valine), involving 9,500 total participants. Research covers Muscle building, Exercise recovery, Fatigue reduction and 1 more areas. The overall evidence strength is rated as Strong.
The evidence is currently rated as "Strong Evidence". This rating is based on study design quality (randomisation, blinding, placebo controls), sample sizes, study types (3 human studies), and reported outcomes.
BCAAs (Branched-Chain Amino Acids) has been researched for: Muscle building, Exercise recovery, Fatigue reduction, Muscle preservation. Each area has its own body of evidence which you can explore in the study breakdowns above.
Yes, 3 out of 148 studies are human trials. Human trials carry more weight in our evidence scoring system.
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