GHK Cu Reconstitution & Stack Questions (Need Advice) : r PeptideDiscussion GHK Cu Copper Peptide Shampoo Anti Hair Loss Shampoo Promotes New Peptide Labz Topical or SubQ GHK Cu? Same molecule. Very different purposes. Topical you apply it on your skin. Think of it as feeding your skin from the outside. In a 12 week study of I didnt expect much when I started using GHK Cu but after 6 months, I get it., Heres what Ive noticed:, My skin feels tighter and smoother, That crepey look? Way less noticeable, Fine