Testosterone is one of the most important hormones in the human body, having a role in muscle growth. Testosterone is a hormone secreted by the testes in males and the ovaries and adrenal glands in women. Natural testosterone secretion is stimulated by exercise and by diet (food and chemicals Shock as: zinc, ZMA, Tribulus, ALC, and so on). Testosterone is an anabolic and anti-catabolic hormone, which is essential to muscle growth, but a large amount (over limit allowed) reverse effects (decreased ability to increase muscle mass) due to excess estrogen in the body.