GHK Cu Copper Peptide 0.5% (topical foam) Shell Medical GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? MIRROR SKIN Copper Elixir 15ml Potent 1% GHK Cu Peptides for Firmi GHK Cu Glow Peptide Stack for Skin Rejuvenation Jennifer R. Berman MD 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 GHK Cu Focal Point Vitality