Leucine, Isoleucine and Valine come under the category of the Branched Chain Amino Acids (BCAAs). These are important amino acids, and cannot be made in the body. BCAAs help in muscle protein synthesis. BCAAs can be used to help during exercise by athletes and regular people, BCAA supplementation can help to preserve existing muscle tissue. BCAAs can support the recovery process by promoting the standard repair processes that take place after exertion.* BCAAs also play an essential role in the maintenance of proper immune system function and the support of healthy aging.*Benefits: VitaGen is NOT responsible for any and all packages detained/impounded/or returned to us by the country’s respective Customs Department. It is the FULL responsibility of the customer to ensure that these vitamins.