You body will naturally produce growth hormone about 40 minutes after falling asleep. Having short naps during the day can maximise this natural reservoir. However this can rarely be fitted into most lifestyles, improvisation essential.
It normally takes a good 20 - 30 minutes of hard exercise before GH starts to be produced naturally this way.
Recent studies have shown that rapid sprinting for short periods of time (20-30 Secs), produces GH in useful quantities.
These include chemicals like GHB and GABBA. GHB will stimulate the body to produce GH, up to 2 IU’s a night. GABBA, although in smaller amounts, will do the same.
This is available in injectable form. It’s extremely difficult to get hold of and very expensive.(Black market only) 4 IU’s every other night will do the trick.