GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu, commonly known as copper peptides, are found naturally within the human body where they play a vital role in skin repair and maintenance. Copper peptides support optimal skin function by helping Glow Peptide Protocol GHK Cu, BPC 157, TB 500 Neurogan Health GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy