Dietary Supplement. 5,000 mg of Branched Chain Amino Acids per serving. Optimum Nutrition 's Bcaa 5000 Powder provides a 5,000 mg (5 g) blend of the three Branched Chain Amino Acids (L-Valine, L-Leucine, and L-Isoleucine) in every serving. The Branched Chain Amino Acids (BCAAs), so named because of their unique branched chemical structure, are essential in that the body cannot make them from other compounds. Optimum Nutrition 's Bcaa 5000 Powder is produced and packaged in our own state-of-the-art manufacturing facility.