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 Cosmetic for Healthy Skin Aging and Wrinkle Support Pure Prescriptions GHK Cu is a naturally occurring copper peptide found in the body that plays a key role in skin regeneration, healing, and overall skin health. As we age, levels declinewhich is where topical GHK CU Cosmetic for Healthy Skin Aging and Wrinkle Support Pure Prescriptions Pptido de cobre GHK GHK Cu Tripptido 1