Andrew Jagim, Ph.D, CSCS  Juice, roids, gym candy, pumpers and stackers are all common nicknames for substances more technically referred to as anabolic-androgenic steroids.  Anabolic steroids are defined as any type of exogenous drug that mimics the effects of testosterone in the body.  Most people take them with the goal of increasing muscle mass, improving performance or enhancing physical appearance.  It is estimated that as many as 3 million Americans have used non-medic...