Why Collagen Loss Accelerates After 40: The Role of GHK Cu in Menopaus Pure & Cimple GHK Cu peptide serum Northern Biolabs GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Hebe GHK for Hair Loss Just 3 Months In! GHK Cu is a game changer for hair restorationjust 3 months of treatment and the difference speaks for itself. Stimulates growth 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.