GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B GHK Cu is a copper peptide known for supporting skin repair, collagen production, and overall tissue healing., Traditionally, its taken as an injection but that can come with irritation, bruising, or Hair sublingual Zeuss Needle less peptides??? Yes, really , Sublingual GHK Cu peptide strips are designed to dissolve under your tongue or at the roof of your mouth, where the tissue is thin and highly vascularmeaning