Amateur sports are the most popular form of physical activity in the world. While the media places its attention on professional sports leagues or the Olympic Games, for every professional athlete of a certain sport there are thousands of people who play the same sport to meet their personal needs and fitness requirements. 1 In women, regular and adequate levels of physical activity improve the muscular and cardiorespiratory systems, reduce the risk of hypertension, coronary heart disease, stroke, diabetes, breast cancer and depression, and are essential to weight control. However, in order to look thinner and athletic in a short amount of time, the use of performance enhancing substances has increased significantly. Among these substances, androgens are very attractive. Androgen abuse epidemiology is higher in recreational sportspeople living in Europe, North America (the United States), Oceania (Australia and New Zealand), and South America (Brazil), and lower in Africa and Asia. A recent meta-analysis estimated that the lifetime prevalence of performance substance abuse worldwide is of 18.4% among recreational athletes. 2 Androgens are hormones that have anabolic properties, with a direct effect on muscle hypertrophy, increased metabolism, and lipolysis. Testosterone is a 19-carbon steroid, and is the most potent endogenous androgen. Anabolic androgenic steroids (AASs) are synthetic compounds that resemble the natural hormone testosterone. 3 Some athletes use AASs continuously, but others try to minimize their possible adverse effects through different patterns of use, as in the following: 4