EAA vs BCAA
Three amino acids versus nine, and why that difference matters.
| BCAAs | EAAs | |
|---|---|---|
| Contains | Leucine, isoleucine, valine | All 9 essential amino acids, including the 3 BCAAs |
| Triggers muscle building | Yes (mainly via leucine) | Yes |
| Can sustain muscle building | No, missing 6 building blocks | Yes |
| Found in | All complete protein foods | All complete protein foods |
The short answer
BCAAs can flip the "build" switch, but a muscle can't build with three building blocks when it needs nine. EAAs provide the full set. Whole protein foods (meat, fish, eggs, dairy, soy) provide the full set plus everything else in food.
Common questions
What are BCAAs?
Branched-chain amino acids: leucine, isoleucine, and valine. They are three of the nine essential amino acids.
What are EAAs?
Essential amino acids: the nine amino acids your body cannot make, so they must come from food. They include all three BCAAs.
Are BCAAs enough to build muscle?
Research suggests no. Building muscle protein requires all nine essential amino acids. BCAAs alone can trigger the signal but cannot sustain the process without the other building blocks.
Is whole protein better than amino acid supplements?
For most people, yes. Whole protein foods provide every essential amino acid along with other nutrients. Amino acid products are mainly a convenience.