Muscle Milk offers quality you can trust. Our Pro Series Aminos powder supplement contains 5g branched chain amino acids, including 3g L-Leucine, 1g L-Isoleucine, and 1g L-Valine, 1 gram sugar, an excellent source of vitamin B12 and no colors from artificial sources. Leucine, isoleucine, and valine are essential amino acids that must be consumed through the diet since the human body cannot make them. 20 amino acids (including essential and non-essential) form the building blocks of protein. The Pro Series Aminos powder supplement formula is also NSF Certified for Sport.