Epigenetic mechanisms activated by GHK Cu increase skin collagen density in clinical trial EurekAlert! GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B 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 Glacier Glow GHK Cu Collection