7 days on GHK Cu. Here's my honest update. I'm not going to hype this up because the real results don't even start until week 46. But something is already happening. A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend The Blue Revolution: Why 1% Pure GHK Cu is the New Standard for Mature Pure & Cimple Thrive Copper Peptide Serum Skin Barrier Support & Hydration 29ml HOUSE OF B] Glutathione Face Film Mask Sheet Skin_ko