ON BCAA 5000 INSTANTIZED 60srv5,000 mg Branched Chain Amino Acid Supplement. 2. 5 g L Leucine, 1. 25 g L Isoleucine, 1. 25 g L Valine, 60 Servings. The Bigger Picture of Branched Chain Amino Acids (BCAAs) L Leucine, L Isoleucine, and L Valine are commonly grouped together and referred to as Branched Chain Amino Acids, or BCAAs, because of their unique branched chemical structure. (BCAAs) are essential, meaning that they must be consumed through the diet, since the human body