Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Buy GHK Cu Peptide UK Copper Tripeptide Research Compound Let's talk about GHKU CU GHK Cu: The Regenerative Glow Peptide GHK Cu (Copper Peptide) is a naturally occurring peptide in your body that plays a powerful role in cellular repair, skin Glow from within GHK Cu is one of the most powerful regenerative peptides for skin, hair, and total tissue health Think: boosted collagen, enhanced healing, and real, visible rejuvenation over time.