GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B 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: Dosage, Before and After Results, and How It Works Perfect B Copper Peptides for Hair Loss: How GHK Cu Can Stimulate Hair Growth HapiPatch