HCG is not an anabolic/androgenic steroid but a natural protein hormone which develops in the placenta of a pregnant woman. Each package, for each HCG ampule, includes another ampule with an injection solution containing isotonic sodium chloride. This liquid, after both ampules have been opened in a sterile manner, is injected into the HCG ampule and mixed with the dried substance. The solution is then ready for use and should be injected intramuscularly. If only part of the substance is injected the residual solution should be stored in the refrigerator. It is not necessary to store the unmixed HCG in the refrigerator; however, it should be kept out of light and below a temperature of 25° C.
The substance choriongonadotropin (HCG) is a white powdery freeze-dried substance which is usually used as a compress. Based on the low structural stability of this compress it can easily fall apart, thus giving the impression of a reduced volume. This is, however, insignificant since there is neither a loss in effect nor a loss of substance.