Essential Amino Acids are the building blocks of protein and they are essential for protein synthesis. The main important amino acids for bodybuilding are Branched Chain Amino Acids (BCAAs) these are Leucine, Isoleucine and Valine. These BCAAs make up one third of the muscle tissue in the body. Also supplementing BCAAs before and after workout along with your post-workout supplement helps speed up recovery and also reduces the effects of catabolism.