GHK Cu 50mg vs 100mg: Which Concentration Should You Buy? 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, AHK Cu + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan Neurogan Health Peptides, like Bio Identical Hormones, are not a magic bullet but they are pretty darn close. Over the years, we have seen them effectively heal chronic wounds, reduce joint paint and The Science and Benefits of GHK Cu Peptide: Skincare, Hair Growth, and Beyond