GHK Cu (glycyl l histidyl l lysine copper) is a powerful peptide that binds with copper to promote skin regeneration and repair. It works by: Stimulating collagen & elastin production Helps firm and smooth the skin. GHK Cu 100MG NuRev Peptides GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy The GHK Cu Peptide: Benefits, Uses, and Why it's Known as the Regenerative Copper Complex