USN BCAA Syntho Amino Stack is a complete Amino Acid stack supplement. It delivers key BCAA’s (Branched Chain Amino Acids) to our muscles which help prevent catabolism. BCAAs are vital for any athlete and from the building blocks of Protein - A necessity for muscle recovery due to protein synthesis. USN BCAA Syntho Amino Stackk is an effective BCAA (Branched Chain Amino Acid) supplement. It also provides you with Alpha-Lipoic Acid alongside the 3 essential Amino Acids; Leucine, Isoleucine and Valine to deliver complete muscle support.