Feb 14, 2011 #1 A aborik24 New member Joined Jul 25, 2009 Messages 2 Reaction score 0 Points 1 I've heard that athletes and bodybuilders use products like Optimum Nutrition Serious Mass and BSN True-Mass to gain "mass." My question is, what type of mass is that? Is the weight that it causes you to gain muscle mass or something else?
I've heard that athletes and bodybuilders use products like Optimum Nutrition Serious Mass and BSN True-Mass to gain "mass." My question is, what type of mass is that? Is the weight that it causes you to gain muscle mass or something else?