BCAAs (Branched-Chain Amino Acids)
Commonly used for
Athletic Performance
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The cheapest product is usually low quality, but more expensive doesn’t always mean better.
What is it? / Overview
A meta-analysis supports a possible modest reduction in post-exercise muscle soreness from BCAA supplementation, but isolated BCAAs lack several amino acids needed for complete muscle protein synthesis — complete protein or full EAA blends are the more complete option for hypertrophy specifically.
How is it used? / Administration
Form: 2:1:1 ratio of leucine:isoleucine:valine — complete protein or essential amino acids (EAAs) supply a more physiologically complete substrate for muscle protein synthesis than isolated BCAAs alone.
Typical dose studied: 5–10 g before or during exercise
Timing: Before, during, or immediately after training, particularly when training in a fasted state
Positioned here for exercise recovery/soreness specifically, not as a muscle-building supplement in its own right.
How well does it work? / Evidence
~ Moderate evidence
Who should avoid it?
Avoid with: Chronic kidney disease (Stage 3, 4, or 5) — NOT on dialysis; Dialysis (Hemodialysis or Peritoneal Dialysis)
Already taking it? If already consuming adequate total daily protein, additional isolated BCAAs generally add little — a complete protein source or full EAA blend is the more physiologically complete option for muscle-building goals specifically.
Research & references
Fedewa MV et al. Effect of branched-chain amino acid supplementation on muscle soreness following exercise: a meta-analysis. Wolfe RR. Branched-chain amino acids and muscle protein synthesis — review.
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