GHK Cu Topical Hair Foam LeadWest Medical 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 Peptide for Skin & Hair Facial Serum & Scalp Solution GHK Cu 10 g (10% Concentrate, 100,000 ppm) Lrak Technologies GHK Cu Copper Peptide Neck & Face Serum GHK Cu Peptide Serum 30 ml, Copper Peptide Serum with Hyaluronic Acid for Tightening, Collagen Boosting