Comparison guide
BCAA, EAA or glutamine?
All three are sold as muscle and recovery amino acids, but only EAAs supply all nine essential amino acids that drive muscle protein synthesis. BCAAs are three of those nine, and glutamine is made in large amounts by muscle itself. If you already eat enough protein, whole protein does the same job for less money.
The options, compared
| Option | Evidence | Best for | The honest note | |
|---|---|---|---|---|
| BCAA (Branched-Chain Amino Acids) | Limited evidence | Not worth the premium | Leucine, isoleucine and valine alone cannot sustain muscle protein synthesis, and no well-controlled trial shows added muscle on top of adequate protein. The one moderate-graded benefit is a small drop in perceived soreness, and about 25 g of whey already supplies 5–6 g of BCAAs. | View |
| EAA (Essential Amino Acids) | Moderate evidence | Low appetite or limited protein intake | All nine essential amino acids carry the anabolic signal (strong evidence, roughly 10–15 g per serving), but free EAAs do not beat an equivalent dose from whey or other complete protein. Their advantage is volume, not efficacy. | View |
| L-Glutamine | Limited evidence | Not for muscle building | Glutamine does not improve muscle mass, strength or performance in healthy trained people, and it failed to prevent post-exercise infections in most trials. Its moderate-graded use is in surgery and burns under medical supervision, and high doses increased mortality in critically ill patients in the REDOXS trial. | View |
Our verdict
If you already hit your protein target, none of the three adds much; spend the money on whole protein. If you want an amino acid product, EAAs at 6–15 g per serving between meals are the defensible choice. Skip BCAAs and glutamine for building muscle.