What are peptides good for?

Research peptides are studied across a wide range of applications: tissue repair and injury recovery (BPC-157, TB-500), weight loss (semaglutide, tirzepatide), growth hormone optimization (CJC-1295, ipamorelin), longevity (epithalon, NAD+, MOTS-c), cognitive performance (semax, selank), and skin health (GHK-Cu). The strength of evidence varies dramatically by peptide and application.