GHK CU Peptide for Skin Rejuvenation Wittmer Rejuvenation Clinic Smooth Crepey Neck Skin with GHK Peptides Skin Lifting Creams and Serums to Help Neck Creases and Skin Discolorations Skin Biology 1 800 405 1912 A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend 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