BCAA: Branched Chain Amino Acids are leucine, isoleucine, and valine. There are 3 BCAAs among the 9 EAAs (essential amino acids).
So when you see the ratio on a label of BCAA (2:1:1, 10:1:1, etc) it means the ratio of leucine:isoleucine:valine….because that’s all BCAAs are. 🙂
Hope that helps 🙂