Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit GHK CU Cosmetic for Healthy Skin Aging and Wrinkle Support Fullscript A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend 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