Reflex nutrition bcaas are known as branch chain amino acids are classed as an essential amino acid meaning our body cannot create them but our body needs them through supplementation or dietr amino acids are the building blocks of protein and help keep muscles protected from breaking down they can also help with protein synthesis which means the growing of musclesr reflex nutrition bcaas are made up of leucine isoleucine and valine they all are required for protein synthesis and aiding ou