The objective of this bachelor thesis is to analyze the effects of anabolic steroid use and its physical and mental aspects. The first part introduces anabolic steroids, explains how they are used and how they influence ones health. It also gives information about doping. The practical part includes qualitative research which was done with use of questionnaire and also interviews. First method mentioned was conducted with electronic questionnaire. All selected respondents trained strenght at least two times a week while having used anabolic substance. This particular analysis focuses mainly on negative health effects on the human body.