BCAA 2:1:1 (Leucine, Isoleucine, Valine)
Also known as: BCAA, branched-chain amino acids, BCAAs 2:1:1, leucine isoleucine valine
A blend of the three branched-chain amino acids, most often at a 2:1:1 ratio of leucine to isoleucine to valine, that has been a staple of intra-workout drinks for decades. Meta-analyses report modest reductions in soreness and muscle-damage markers after resistance exercise. Because BCAAs lack the other six essential amino acids, they do not sustain muscle protein synthesis on their own, which is why many brands have shifted toward complete EAA blends.
Research summary
Leucine triggers mTOR-mediated muscle protein synthesis; isoleucine and valine provide oxidative fuel during exercise.
Dosage
Daily amounts, of compound.
| Lowest studied | Typical range | Highest studied | Upper limit |
|---|---|---|---|
| 5 g | 5–10 g | 20 g | — |
5–10 g per serving before, during, or after training is the norm; trials have used up to about 20 g/day or 0.2 g/kg. A 2:1:1 blend at 5 g delivers 2.5 g leucine. The ISSN protein position stand notes that free BCAAs alone are inferior to a complete protein or EAA source for building muscle.
Standardization: 2:1:1 leucine:isoleucine:valine
Source material: fermentation-derived amino acids
Format suitability
- Capsule
- Powder
- Tablet
- Softgel
- Gummy
- Liquid
Gram-scale dose; powder in practice. BCAAs are hydrophobic and bitter and need instantizing (lecithin coating) plus strong flavoring to mix well in drinks.
Formulation notes
Commonly combined with electrolytes and citrulline in intra-workout products. Where the formula already includes a full EAA blend or a protein serving, extra BCAAs add little.
Sources
- Does Branched-Chain Amino Acids (BCAAs) Supplementation Attenuate Muscle Damage Markers and Soreness after Resistance Exercise in Trained Males? A Meta-Analysis of Randomized Controlled Trials (Khemtong 2021)PubMed
- International Society of Sports Nutrition Position Stand: protein and exercise (Jäger 2017)PubMed
- Branched-Chain Amino Acids — ExamineExamine
Related ingredients
Beta-Alanine
Sports performanceA non-essential amino acid that combines with histidine to form carnosine, the main intramuscular buffer of hydrogen ions during intense exercise.
Typical: 3.2–6.4 g
L-Citrulline
Sports performanceA non-protein amino acid that the kidneys convert to arginine, raising plasma arginine more efficiently than oral arginine itself.
Typical: 6–8 g
Citrulline Malate (2:1)
Sports performanceA salt of citrulline and malic acid, most often in a 2:1 ratio, that has been the traditional form in pre-workouts.
Typical: 6–8 g
Sodium Bicarbonate
Sports performanceBaking soda, used in sports nutrition as an extracellular buffer that raises blood bicarbonate before high-intensity efforts lasting roughly one to ten minutes.
Typical: 14–21 g
Peak ATP (Adenosine 5'-Triphosphate Disodium)
Sports performancePeak ATP is a patented, orally stable form of adenosine 5'-triphosphate disodium from TSI Group.
Typical: 400 mg