Amino acids
BCAAs
Also called: branched-chain amino acids, leucine, isoleucine, valine
Three essential amino acids (leucine, isoleucine, valine) found in all protein.
- Why people take it
- Muscle growth and recovery.
- What the evidence says
- Not better than getting enough total protein; little added benefit for most people.
- How it is usually taken
- Usually 5 to 10 g around exercise; enough daily protein makes them mostly unnecessary.
- Be careful
- Generally safe. Not for people with maple syrup urine disease or ALS.
- Medicines it can interact with
- May affect blood sugar with diabetes medicines; avoid with the rare condition maple syrup urine disease.
Other amino acids
Common questions
What is BCAAs?
Three essential amino acids (leucine, isoleucine, valine) found in all protein.
Why do people take BCAAs?
Muscle growth and recovery.
Does BCAAs work?
Not better than getting enough total protein; little added benefit for most people.
How much BCAAs do people take?
Usually 5 to 10 g around exercise; enough daily protein makes them mostly unnecessary.
Is BCAAs safe?
Generally safe. Not for people with maple syrup urine disease or ALS.
Does BCAAs interact with medicines?
May affect blood sugar with diabetes medicines; avoid with the rare condition maple syrup urine disease.
Sources and further reading
Last reviewed 31 October 2026. Written by Satya Babu.
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