How to cycle ghk cu? : r PeptideGuidesPH Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare Full honest & unfiltered experience with GHK Cu 1 month after completing a 12 week cycle: Weeks 12: No noticeable changes. Weeks 34: Skin rash (rib area) worsened. Weeks 56: Extreme dryness, flaking, GHK Cu Copper Peptide: The Ultimate Peptide For Longevity GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes