HCG is not an anabolic/androgenic steroid but a natural protein hormone which develops in the placenta of a pregnant woman. Athletes use injectable HCG to increase the testosterone production. Most athletes, however, use HCG at the end of a treatment in order to avoid a "crash" that is, to achieve the best possible transition into "natural training". A precondition, however, is that the steroid intake or dosage be reduced slowly and evenly before taking HCG. Although HCG causes a quick and significant increase of the endogenic plasmatestosterone level, unfortunately it is not a perfect remedy to prevent the loss of strength and mass at the end of a steroid treatment... -- more about HCG --