Peptide Therapy for Pain Management and Healing Core Medical & Wellness Bounce Back Better with Peptides for Injury Recovery GHK Cu suppressed the activation of the p38 MAPK signaling pathway in Download Scientific Diagram Defy GHK Cu (glycyl L histidyl L lysine) is a naturally occurring copper binding peptide found in human plasma. As levels decline with age, so may its support of the biological processes involved in collagen production, skin