Do anabolic steroids affect aggression and hostility? Anabolic steroids have been widely used by athletes since the 1950s; the purpose of use is to add muscle mass, speed, strength and endurance. Anabolic steroids come in two methods: injectable forms and oral forms. Oral and injectable steroids metabolize differently in the body. Oral steroids contain different hormones than injectable steroids. Oral steroids may include, but are not limited to, methyltestosterone, fluoxymesterone, and stonazolol. Injectable steroids may contain, but are not limited to, trenbolone acetate, testosterone propionate, and stanzolol. Surveys have been done and have shown that 80-100% of bodybuilders, weightlifters and professional athletes have used or are using steroids. As steroid doses increase higher and higher, there is an increase in aggression, loss of fatigue, decreased libido, and mood changes. A study was conducted to determine whether or not these so-called side effects were true. The study was carried out on three weightlifters who had been taking steroids for several years. Each of the participants was tested four times; once without steroids, then twice without steroids and once again without steroids. The experiment used a control group consisting of three weightlifters who had never used steroids. Participants' ages ranged between 21 and 29 years and years of training experienced ranged between 4 and 11 years. They wanted to find participants of the same age and experience level to ensure correct results and try to limit factors that could potentially affect the outcome of the experiment. Steroids are usually taken on a cycle. Most anabolic steroid cycles last 3 to 11 weeks mid document...... Effects on Hostility and Aggression. Human Psychopharmacology, 5, 349-356. Lorang, M., Callahan, B., Cummins, K., Achar, S., & Brown, S. (2011). Anabolic-androgenic steroid use among adolescents: prevalence, demographics, and perception of effects. Journal of Child & Adolescent Substance Abuse, 20, 358-369. Yates, W., Perry, P. and Murray, S. (1992). Aggression and hostility in anabolic steroid users. Biological Psychiatry, 31(12), 1232-1234. Anabolic steroid abuse. (nd). What effects do anabolic steroids have on behavior?. Retrieved November 23, 2013, from www.drugabuse.gov/publications/research-reports/anabolic-steroid-abuse/what-effects-do-anabolic-steroids-have-behaviorSide Effects of Steroid Abuse - Steroidabuse.com. (nd). Side Effects of Steroid Abuse - Steroidabuse.com. Accessed November 23, 2013 from http://www.steroidabuse.com/side-effects-of-steroids.html