100% Pharmaceutical Grade. Use RSP Nutrition's BCAA 3:1:1 to: increase lean muscle growth, increase muscle endurance, accelerate muscle recovery, combat muscle catabolism. BCAA [branched chain amino acids] consists of three essential amino acids: Leucine, Isoleucine, and Valine; all of which play a critical role in muscle development and recovery. The most important BCAA for muscle growth is Leucine due to its unique ability to act as a catalyst for muscle protein synthesis. RSP Nutrition's BCAA's contain a scientifically suggested 3:1:1 ratio of Leucine to Isoleucine to Valine, providing the optimal Leucine dosage for maximum muscle performance support.