What are branched-chain amino acids?

BCAAs refer to three essential amino acids: leucine, isoleucine, and valine. They are distinct from other essential amino acids as they possess a branched side chain and play a large role in the regulation of muscle mass. They are present in high amounts in muscle tissue in comparison to other essential amino acids.^[1] BCAAs cannot be synthesized in the body, so they are important to ingest daily. Daily protein sources, such as eggs and meat, typically provide an adequate amount.^[2]