The main reason is that it is inconvenient. To effectively administer this substance, you must simulate the natural pusaltile secretion of GnRH. This requires and intravenous infusion pump that is worn 24/7. This type of therapy is extremely costly and the only place you will find it is through a physician.
This is rarely needed for recovery purposes with respect to the average AAS cycle. A combination of HCG with Nolvadex and/or Clomid is more than sufficient if administered properly. If anything, an FSH preparation can be added to HCG if and when HCG by itself is unsuccessful.
Gonadotropin therapy in the forum of HCG and, if necessary, an FSH preparation such as HMG or rFSH is the preferred form of treatment and GnRH therapy is usually the second alternative when HCG/FSH is not successful.
Jenetic