Copper Peptides: GHK Cu is your skin's built in botox Fatskn Copper Peptide Serum GHK Cu + Argireline + Matrixyl 3000 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 GHK Cu Youthful Skin, Healthy Cells, Vibrant You. GHK Copper Peptide GHK Cu Tripeptide 1