There is a reason drugs go through trials before they are approved, and most drugs fail at some stage during the trials. If secretagogues peptides were completely safe, and had the desired effects, they would likely have been marketed by pharmaceutical companies (whether they would be banned in sports would be a different question).
Anyone taking drugs that have not been approved is playing with their life (and to be honest, I have very little sympathy). Bodybuilders in particular have been spectacularly wrong about the long-term side effects of drugs before, so I wouldn't even think about taking advice from them. Their forums are a freak show which dwarves the Rock Racing team bus.