GHK Cu Copper Peptides: Topical vs Injectable GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Everyone's calling GHK Cu a miracle peptide But let's separate marketing from mechanism. GHK Cu isn't magic. It's a signal. A signal that: Supports tissue repair Modulates inflammation Enhances collagen + Copper Peptides vs. Retinol: Which Anti Aging Powerhouse is Right for Pure & Cimple