AMINO 5600 Essential, Branched-chain amino acid formula AMINO 5600 is a wide spectrum amino acid formula with - among others - all the essential and branched-chain amino acid types. Essential amino acids are indispensable for us because they cannot be synthesized by the body and therefore must be supplied in the diet. The branched-chain amino acids (BCAA’s) are also essential ones and they account for approximately 35% of the essential amino acids in muscle proteins. AMINO 5600 is manufactured from high-quality proteins with the addition of free-form L-Glutamine!