Why Collagen Loss Accelerates After 40: The Role of GHK Cu in Menopaus Pure & Cimple GHK Cu for Skin & Wound Healing: Current Evidence Meeting Point Health 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 GHK Cu (Copper Peptide): A Smarter Way to Support Skin Regeneration Top Rated Scottsdale Med Spa Babyface Ozark Have you heard of GHK Cu the copper peptide your body is already making? GHK Cu (Glycyl L Histidyl L Lysine Copper) is a naturally occurring tripeptide found in human plasma, saliva, and urine.