Copper Peptide (GHK Cu): Clinical Uses, Stability & Compounding Tips GHK Cu Copper Peptide Therapy for Hair & Skin in Mumbai GHK Cu is a naturally occurring tripeptide in human plasma. Levels average 200 ng ml at age 20 and drop to 80 ng ml by age 60 (Pickart et al., 2020). That decline tracks with GHK Cu Peptide Benefits for Skin and Hair LIVV Natural GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy