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BCAA / EAA

BCAA, EAA, branched-chain amino acids, essential amino acids · Performance

LimitedLittle human data — early, small, or narrow.

Amino-acid supplements whose benefit shrinks toward zero once total protein intake is adequate — the trials keep saying so.

What the evidence says

BCAAs alone stimulate a limited muscle-protein-synthesis response — smaller than a complete essential-amino-acid or protein source provides, since synthesis needs the full set. EAAs are more defensible (they are the full set), but when total high-quality protein intake is adequate, trials generally show little additional benefit from either.

What studies used

Studies typically used BCAA 5–10 g or EAA 10–15 g. Study protocols dosed around training sessions.

Reported from published studies and product labelling — a record of what was used in research, not a recommendation. What is right for you is a conversation with a clinician.

Watch out for

  • At an adequate protein intake, trials show little added benefit — total daily protein is the variable that matters
  • An incomplete amino profile cannot replace a complete protein source in the diet

Evidence base

A166 research papers
substantial literature

Strong human evidence: either a phase 3 or 4 trial report alongside review-level evidence, or ten or more randomised controlled trial reports.

This letter measures how much human research exists, not whether it works for you — the tier above (Limited) is the read on quality.

Research (12)

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Where next

Every supplement in the catalogThe full shelf, grouped and evidence-tiered.→The compound indexSteroids, nootropics and research chemicals.→The peptide indexInjectable peptides and what trials used.→