From the Manufacturer:
BCAA 1000 Capsprovides a 1,000 mg (1g) blend of the three Branched Chain Amino Acids (L-Valine, L-Leucine, and L-Isoleucine)in every serving. The Branched Chain Amino Acids (BCAA's), so named because of their unique branched chemical structure, are essential because the body cannot make them from other compounds.