Meet Your New Anti Aging Powerhouse: GHK Cu Peptide Serum If you're looking for a seriously effective addition to your skincare routine, this is it. Our GHK Cu serum is a high performance, copper Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum GHK CU Regenrative and Protective Agent Peptides World How to look much younger within a year GHK Cu is one of the most studied skin peptides on the planet, it stimulates collagen production, improves firmness, and helps skin recover from damage.