GHK Cu: The Copper Peptide And The Claims Around It, GHK Cu is a naturally occurring copper binding tripeptide found in human plasma. Mechanistically, its linked to tissue repair signaling, immune The science behind the peptide craze Scientific American Therapeutic Peptides in Aesthetic, Metabolic and Endocrine Conditions: Effects, Safety, Clinical Applications, and Future Perspectives Five Peptides Every Endurance Athlete Should Understand