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 GHK Cu Reconstitution & Stack Questions (Need Advice) : r PeptideDiscussion GHK Cu Copper Peptide Shampoo Anti Hair Loss Shampoo Promotes New Peptide Labz Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb Struggling with hair thinning or shedding? Meet GHK Cu, the topical peptide everyone is talking about and NO, it's not an injection! This powerful serum helps: Reduce shedding