BCAA Stack, with its clinically suggested ratio of branched-chain amino acids & glutamine, can actually help promote strength, support performance, provide energy during dieting, & support lean mass gains while optimizing bodyfat loss.BCAA Stack is perfect for all serious athletes, from the bodybuilder to the marathoner, the gainer to the dieter. Studies have suggested that the formula in BCAA Stack can promote nitrogen retention, which in turn helps your body accumulate lean mass. Furthermore, recent studies have surmised that the BCAA/glutamine stack could promote strength & positively promote body composition.