BCAAs, or Branched Chain Amino Acids, are the building blocks of the cells your body is made of, but BCAAs refer to three specific amino acids in particular: leucine, isoleucine, and valine. During a tough workout your body is breaking down protein to convert muscle amino acids into fuel. That's great for powering through a workout, but can have a negative impact when it comes to growing or maintaining muscle. Cellucor BCAA Sport contains a well-founded 2:1:1 ratio of BCAAs to help replenish that protein lost in strenuous exercise and support lean muscle growth, and contains electrolytes to combat fatigue and promote energy so you can go harder, longer without the sugar crash that happens with a typical sports drink.BCAA Sport carries the Informed Choice logo. This means that the product has gone through a full manufacturing audit, and is regularly tested for a wide variety of WADA banned substances to ensure safety for sport.