Branched-chain amino acids (BCAAs) include L-leucine, L-isoleucine, and L-valine. They are considered to be essential amino acids because your body cannot produce them on its own. Essential building blocks for protein synthesis, BCAAs play vital roles in muscle growth and recuperation, which is why branched-chain amino acid supplements and combination formulas are so popular among weight lifters and body builders. Dairy products and red meat are two of the best dietary sources of BCAAs, while whey protein and egg protein are two other supplemental options you may consider. We also offer a vegetarian formula: Swanson Ultra AjiPure Branched Chain Amino Acids.