Has anyone tried copper peptides for rosacea? Top 9 GHK Cu Benefits for Skin, Hair, and Anti Aging GHK Cu Repairing Serum 30ml SumaNurica 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 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