"The BCAA Are A Group Of Three Essential Amino Acids:
1. Leucine
2. Isoleucine
3. Valine.
The BCAA are different from the other 17 amino acids in that they are primarily metabolized in skeletal muscle (Layman, 2003) and metabolized at a much lower rate in the liver (Norton, 2005). The rate limiting enzyme in BCAA catabolism is Branched Chain Keto Acid Dehydrogenase, which is much more active in skeletal muscle than in the liver (Norton, 2005).
Because BCAA serve as a "fuel" for skeletal muscle, supplementing with additional BCAA to improve sports performance and to treat various diseases and aliments as been suggested."
http://www.bodybuilding.com/fun/beast11.htmThe above link further discusses various metabolic and other puirported effects of BCAA supplementation. Happy reading.