GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? If your goal is better skin not just the temporary glow GHK Cu is your peptide! Stimulates collagen + elastin Improves firmness and elasticity Reduces fine lines + Epigenetic mechanisms activated by GHK Cu increase skin collagen density in clinical trial EurekAlert! Two new treatments, now available Copper Peptide Skin Complex brings prescription grade GHK Cu Acetate to support skin repair and renewal at the cellular level. Lash Growth Serum combines bimatoprost and latanoprost, prescription strength GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack?