with generally causes massive muscle mass. It is also very common in endurance sports because has the effect of accelerating the process of regeneration of the body. But doping is accompanied by major risks ... The side effects on health are disastrous: Infertility Testicular degeneration Hair loss Important development of acne High risk of heart attack Severe cardiovascular disorders Aggressiveness And the list does not end there .... Fortunately, there are natural ways to increase its levels: Running regularly .