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: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration Shed Copper Peptide Hair Growth Serum Take an Rx approach to hair health GHK Cu Cooper Peptide: The Complete Skin & Repair Guide (2026)
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