Fitish Most people don't know GHK Cu by name. Their face does. It's the peptide your body uses to signal collagen production, repair tissue, Instagram 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. GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 7% GHK CU ACCELERANT Platinum Skin Care