So n00bs, this is based on what I've quickly read in this thread, but the idea that I've gotten is that the peptides stimulate the GH release but it's different to an injection of GH itself because while stimulation with peptides occurs and increases the amount released by the body, theres only so much of an effect it can have, before the body becomes unreceptive to it etc. And that as a result there's no shutdown of the glands which control GH release etc.
I'm sure it's waaay more complicated than that but wouldn't mind a basic understanding of how it works.