This state-of-the-art formula plays a principle role in muscle recovery, muscle growth and energy maintenance. Branched Chain Amino Acids are incredibly powerful because they are metabolized directly in the muscle, not the liver. As a result, weight training dramatically increases BCAA uptake, creating a higher demand for them. And, since BCAA's are essential amino acids, which can not be made within the body, they must be supplied through foods or supplementation.