I believe this topic fits better in the area covering hormones, AAS treatments, and those GLP-1 medications, just saying. Anyway, certain peptides might support efforts in bodybuilding without providing any straightforward muscle growth themselves. Substances such as HGH, Tesa/Ipa, along with insulin, offer some minor benefits, while BPC157 and TB500 aid in healing following intense training sessions. By the way, using insulin to build muscle isn't wise since the risk of fatal error is high. I bring it up only due to its application by professional bodybuilders during mass gaining phases. Proper expertise is essential for safe handling, as there's zero room for mistakes that could prove deadly.