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 Topical Spray Wells Pharmacy Network Understanding Topical GHK Cu Peptide Benefits for Skin Rejuvenation in Maryland Preston's Pharmacy 7% GHK CU ACCELERANT Platinum Skin Care GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution