Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience Hair Growth Serum Intense with Copper Peptide GHK Cu 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 a growing body of peer Does GHK Cu Regrow Hair? Here's What the Research Shows