i work at a gnc store...and yea tha shit is marked up 300% it seems like....i have dumb asses come in everday asking the dumbest shit...today i had this customer to come in and tell me that he bought some calf milk from a feed store and hes using that shit to make his protein shakes.......ive never heard of this before until today.....my opinion this guy is an idiot...have any of yall ever heard of anyone doing this before???