GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu Injection Pen Australia Subcutaneous Copper Peptide Inject+ GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution GHK Cu by SubQ Society Test Certificate Finnrick Analytics 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