HUMAN GROWTH HORMONE AND TESTOSTERONE! Human growth hormone (HGH) and testosterone are both anabolic steroids commonly used by bodybuilders to gain muscle mass. They have legitimate medical uses, but they are more commonly known for their use as bodybuilding supplements. Although both are used for the same purpose, they are in fact very different substances. Testosterone is a hormone produced naturally by both men and women, although men produce much more than women do. The form used by bodybuilders is synthetic and is produced in a lab. Testosterone causes the body…