GHK Cu Peptide Rescues Aging Cognition but Splits Molecular Pathways in the Brain News Rapamycin Longevity News GHK Cu Peptide Therapy Collagen & Skin Renewal 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 Fitish Most people don't know GHK Cu by name. Their face does. It's the peptide your body uses to signal collagen production, repair tissue, Instagram