L-Leucine, L-Isoleucine, L-Valine, L-Glutamine Free Form Amino Acids with Glutamine and B6 Dietary Supplement BCAA Complex contains the ideal 2:1:1 ratio of the free form, crystalline branched chain amino acids L-Leucine, L-Isoleucine and L-Valine combined with the conditionally essential amino acid L-Glutamine. BCAA"s exert an anticatabolic effect by reducing the breakdown of protein, thereby protecting muscle tissue. Glutamine is a preferred source of fuel for the intestinal cells and is in high demand by skeletal muscles following physical exertion. Vitamin B6 enhances amino acid metabolism.