The Ultimate Guide to Copper Peptides for Skin Before and After Bene HapiPatch GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? 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