GHK Cu 50mg vs 100mg: Which Concentration Should You Buy? One of my favorite peptides is GHK Cu. It has made such a dramatic impact on my skin in just one cycle I've been shocked! It supports collagen, healing, and overall skin Sublingual GHK Cu TruHealth Physical Therapy Peptide Therapy for Hair Growth: Explore Your Options 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, USA Copper Peptide GHK Cu Powder, DIY Blue Copper for Best Skin 1g