Biossance Squalane + Copper Peptide Rapid Plumping Serum GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Dr Paul skipped spending thousands of $$$ for injectable peptides. He is spending less than $90 mo with our patch, activating his own GHK Copper Peptides! The changes in his skin and complexion Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference