Known to initiate protein synthesis and delay fatigue during endurance efforts, branched-chain amino acids are an essential supplement for the dedicated athlete seeking a leg up on the competition. Pick up the GU BC Capsules to gain the benefits of these essential building blocks of protein, so you can reap the benefits of your hard training routine and endurance sports. Each bottle contains 60 separate capsules with a serving comprised of two capsules. GU recommends taking these before, during, and after strenuous activities to prevent the breakdown of muscle tissue.