New MUTANT PRO's one-of-a-kind formula is backed up by numerous scientific studies. In fact, in one clinical study, subjects using one of the specific proteins making up MUTANT PRO increased muscle size by an average of 24% in just 12 weeks! Could you imagine increasing the size of your biceps by 24%? If you're looking to make noticeable gains in muscle size and strength, then the new MUTANT PRO bar is exactly what you need!

Reference
Esmarck B, Andersen JL, Olsen S, Richter EA, Mizuno M, Kjaer M. Timing of post-exercise protein; J Physiol. 2001 Aug 15;535(Pt 1):301-11.