GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B As a skincare founder who has spent $1.3 million testing products and procedures on her own face, I've tried more peptides than I can count at this point. GHK Cu is the one Oral Liposomal Copper GHK Liposomal GHK Cu Supplement GHK Cu Ascend Bio Labs Copper Peptides for Skin: What GHK Cu Does and How It Compares to Retinol GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective?