TREC NUTRITION GOLD CORE BCAA ULTRA SPEED. The product contains L-leucine, L-valine and L-isoleucine in a 2:1:1 ratio that is optimal for the body. BCAA - branched chain amino acids, amino acids with branched side aliphatic chain, which constitute an incredibly important group of amino acids for the proper functioning of the organism, in the composition of which there are leucine, isoleucine and valine.