How GHK Cu Strengthens Hair Follicles to Combat Hair Loss HapiPatch GHK Cu (Copper Peptide) Deep Dive: Mechanisms, Benefits, Risks, Forms, & Dosing 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK 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,