Does GHK Cu Regrow Hair? Here's What the Research Shows Copper Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience 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 Co delivery of bioactive peptides by nanoliposomes for promotion of hair growth ScienceDirect GHK Cu Topical vs Injection Which is the Better Copper Peptide Form?