Your body stops naturally producing gh generally around the age of 25. This why bodybuilders in Arnolds generation were winning Mr. O's in their 20's and retiring around 30, but Dexter Jackson can still place top 5 at the Arnold Classic in his 40's.
My point being, there is no reason to kick start its production because there will not be any production to kick start. HGH is a miracle drug though IMO and like Whitewidow said, why stop using it?