Peptides marketed for muscle growth, recovery, and tapping the growth-hormone axis, BPC-157, TB-500, ipamorelin, CJC-1295, IGF-1 LR3, MK-677. None of these are approved for performance. Most of what you read on forums rests on animal studies, small open-label trials, or vendor copy. Many are explicitly banned in sport by WADA. Popularity here is not the same as proof.
Cluster assignment reflects each peptide’s primary intent, its main reason for being on the site. Some peptides span clusters in practice (tesamorelin is approved for HIV-associated visceral fat but is also chased by bodybuilders); we file each under one canonical cluster and link out where the cross-over matters.