GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health Copper Peptide GHK Cu Copper Peptide 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) Deep Dive: Mechanisms, Benefits, Risks, Forms, & Dosing GHK Cu Peptide: What It Does for Body Composition and Metabolic Health