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. 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.