Branched chain amino acids (BCAA's) are vital in helping your muscles recover and grow, especially following a hard workout. You can get BCAA's from certain foods, but at nowhere near the same potency as in Resurgence. A higher concentration of amino acids helps your body stimulate muscle protein synthesis and promote new muscle growth. Resurgence uses a 2:1:1 amino acid ratio giving 2g of Leucine per scoop, Leucine being the most anabolic of all amino acids. It is also filled with healthy vitamins and minerals, as well as a nootropic blend to nourish your brain and enable you to be more productive at work.