Branched Chain Amino Acids Dietary Supplement True Strength The True Strength 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 cannot make them from other compounds. BCAAs provide active adults with versatile support for training endurance and recovery. Used with protein powders and/or protein-rich foods, these 1 g capsules help support muscle recovery and protein synthesis.