BCAA 6000™ from Gaspari Nutrition uses a “leucine heavy” 4:1:1 ratio of 100% pure pharmaceutical grade branched chain amino acids, in a formula that provides clinically validated and effective quantities of these critical nutrients in every dose. Branched-chain amino acids (BCAAs) got their names due to their unique molecular structure, which is different from the other amino acids. All BCAAs are considered “essential amino acids” because your body can’t synthesize them from other compounds and they must be obtained through your diet.