Prolab BCAA Plus provides the essential amino acids L-Leucine‚ L-Valine and L-Isoleucine. These three protein sparing amino acids are known as branched chain. It is a well know fact that amino acids are responsible for protein synthesis‚ hence the nickname "building blocks." Studies show BCAAs are important for muscle growth and recuperation. Muscle production depends on an increase in protein synthesis. Your body cannot manufacture its own BCAAs-they muscle be supplied through your diet. DO not short change your progress‚ use Prolab BCAA Plus.