BCAA is a general term for the essential amino acids valine, leucine, and isoleucine that are metabolised by the body and used as sources of muscle energy and general body maintenance. They are referred to as Branched Chain Amino Acids because the molecular structure of these three amino acids includes branches. BLOCKHEAD uses the highest quality and most pure form of BCAAs - iBCAAs. iBCAA aids with absorption and is faster and more efficient than BCAA formulas commonly used on the market. We have used a 2:1:1 ration which is reference to the rations of L-leucine, L-valine, and L-isoleucine.