Ozark Have you heard of GHK Cu the copper peptide your body is already making? GHK Cu (Glycyl L Histidyl L Lysine Copper) is a naturally occurring tripeptide found in human plasma, saliva, and urine. Copper Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience GHK Cu 50mg Lyophilized Peptide PatriotChems GHK CU 50mg Peptify Does it work? Maneup GHK Cu hair growth serum : r tressless