GHK Cu Peptide Serum 30 ml, Copper Peptide Serum with Hyaluronic Acid for Tightening, Collagen Boosting Copper Peptide Hair Growth Conditioner GHK Cu for Hair Loss Hairgenetix Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 Dr Tahera explains that the topical version of GHK Cu and how it supports skin repair and rejuvenation. This is the cream based approach. Injectables? We'll cover that next. Because understanding your options matters.