GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? Bounce Back Better with Peptides for Injury Recovery The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, GHK Cu (Copper Peptide) is a naturally occurring peptide in the body that binds with copper to support cell repair and renewal. As we age, our levels decrease and thats where supplementation or Unlocking the Power of Peptide Therapy: Your Guide to BPC 157, GHK Cu, AOD 9604, and GLP 1 Peptides at Gardenia Aesthetics & Wellness