Has anyone tried copper peptides for rosacea? Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Rosacea isn't just about rednessit's often a sign of a compromised skin barrier and ongoing inflammation. When the barrier is weakened, skin becomes more reactive: Increased sensitivity Higher transepidermal water Cellular Glow Copper Peptide GHK Cu Serum for Face GHK Cu (copper peptide) used topically is one of the most well studied skin repair peptides. Here's how it helps the skin, in practical terms: 1. Boosts collagen & elastin GHK Cu signals your skin