Peptide GHK CU Cream Concierge MD Copper Peptides Before and After: Visible Skin Improvements Explained Hubmed GHK Cu 50mg Research Peptide Regen Peptides UK GHK Cu (copper peptide) is a science backed anti aging compound that supports collagen production, skin regeneration, and overall skin health. Used in both topical serums and subcutaneous 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