The correct environment is making sure you get optimal conversion to IGF1 once the Gh is taken(for it is this hormone that is responsable for all the new tissue growth(not the GH), this synergistic effect is best done with the use of a rapid insulin, although good effects can be achieved with manipulation of ones blood sugar levels via food intake(but most opt for the more easy direct approach)
Once this equation has been satisfied you then need to supply the body optimally with nutrients(calories)to enable the IGF1 with enough ammo to do its job probably so to speak.
For tissue growth you need a positive nitrogen state and this can be enhanced dramatical via the use of a anabolic steroid, this coupled with adequate nutrients and above normal blood plasma levels of IGF1 floating around creates a magnificent growing environment !!!
So for those whom say Gh is useless , they are partly right in this observation , but truth be known put the above equation together and it results in fantastic growth capability's, far greater ability than if only part of the above was implemented !!!!