Sourced using only premium grade ingredients, this BCAA 2:1:1 - BLACK (previously known as BCAA 2:1:1) contains the optimal balance of leucine, isoleucine and valine in a 2:1:1 ratio. Also known as Branch Chain Amino Acids made up from Leucine, Isoleucine and Valine, they make up a unique premium blend of amino acids all in one convenient pouch.