Turn Back Time with GHK CU Peptides Meet one of the most powerful anti aging peptides in skincare GHK CU. This advanced peptide helps to: Tighten and firm loose skin GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true? Copper peptide, known as GHK Cu, has Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs GHK CU Royal Blue Serum Aseir Custom