Branched-Chain Amino Acids
Branched-chain amino acids (BCAAs) are the essential amino acids leucine, isoleucine and valine, which are normal components of dietary protein.
Also listed as BCAAs, BCAA
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
What are BCAAs?
BCAAs are the essential amino acids leucine, isoleucine and valine. They are components of protein, not a separate dietary requirement for a sports powder. 1
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Are soreness and performance the same outcome?
No. The cited review examined soreness and muscle-damage markers; its positive results should stay attached to those outcomes. 2
Does everyone who trains need extra BCAAs?
NIH does not find consistent evidence that extra BCAAs improve performance beyond adequate dietary protein. 1
Sources
- Dietary Supplements for Exercise and Athletic Performance: Fact Sheet for Health Professionals NIH Office of Dietary Supplements
