As with no other doping drug, growth hormones are still surrounded by an aura of mystery. Some call it a wonder drug which causes gigantic strength and muscle gains in the shortest time. Others consider it completely useless in improving sports performance and argue that it only promotes the growth process in children with an early stunting of growth. Some are of the opinion that growth hormones in adults cause severe bone deformities in the form of overgrowth of the lowerjaw and extremities. And, generally speaking, which growth hormones should one take the human form, the synthetically manufactured version, recombined or genetically produced form and in which dosage? All this controversy about growth hormones is so complex that the reader must have some basic information in order to understand them. The growth hormones is a polypeptide hormone consisting of 191 amino acids. In humans it is produced in the hypophysis and released if there are the right stimuli (e.g. training, sleep, stress, low blood sugar level). It is now important to understand that the freed HGH (human growth hormones) itself has no direct effect but only stimulates the liver to produce and release insulin-like growth factors and somatomedins. These growth factors are then the ones that cause various effects on the body. The problem, however, is that the liver is only capable of producing a limited amount of these substances so that the effect is limited. If growth hormones are injected they only stimulate the liver to produce and release these substances and thus, as already mentioned, have no direct effect. The use of these STH somatotropic hormone compounds offers the athlete three performance-enhancing effects. STH (somatotropic hormone) has a strong anabolic effect and causes an increased protein synthesis which manifests itself in a muscular hypertrophy (enlargement of muscle cells) and in a muscular hyperplasia (increase of muscle cells.) The latter is very interesting since this increase cannot be obtained by the intake of steroids. This is probably also the reason why STH is called the strongest anabolic hormone. The second effect of STH is its pronounced influence on the burning of fat. It turns more body fat into energy leading to a drastic reduction in fat or allowing the athlete to increase his caloric intake. Third, and often overlooked, is the fact that STH strengthens the connective tissue, tendons, and cartilages which could be one of the main reasons for the significant increase in strength experienced by many athletes. Several bodybuilders and powerlifters report that through the simultaneous intake with steroids STH protects the athlete from injuries while inereasing his strength.