Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum 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 Amazon.com: Copper Peptide Hair Serum with Copper Tripeptide 1 Dual Peptide Scalp Treatment plus Licorice Root Extract : Beauty & Personal Care