GHK CU Before and After Pictures Topical GHK Cu Skin Results, Face Serum Reviews & Photo Results Neurogan Health 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 Helloskin GHK Cu 1% Triple Peptide Regenerative 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