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Optimum Nutrition's BCAA 1000 capsules provide a 1000 mg blend of 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. BCAAs, may improve nitrogen retention by sparing other amino acid groups for repair and rebuilding. In recent times, these amino acids have been investigated for their potential anticatabolic effect.