lastresort said:
As others have pointed out, there is no such thing as an anabolic peptide. Even growth-hormone-releasing compounds such as sermorelin, ipamorelin, or tesamorelin will not build muscle. I gave them a shot, and although they do provide specific advantages, such as reducing visceral fat, you would be better served by anabolic steroids, testosterone at the very least.
The sole option that could potentially be of help is follistatin, a myostatin inhibitor, though it carries a risk of heart enlargement