The most vital component in BCAA’s due to its affects in muscle protein synthesis which in hand promotes muscle growth. Also L-Leucine aids in the prevention of catabolism as well, which is very beneficial while dieting. L-Isoleucine – aids the body in recovery from vigorous activity and may also improve endurance and stamina. L-Valine is very similar to L-Isoleucine in the sense of one’s energy levels, promoting muscle growth and increasing muscle protein synthesis to aid in muscle building and repair.