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 Amazon.com: GHK Cu Copper Peptide Supplement, 120mcg High Purity Supplement for Skin & Hair, Enteric Coated for Maximum Absorption, Vegan & Gluten Free (60 Count) : Health & Household GHK Cu Peptide: Benefits for Tissue Repair, Healing, and Recovery Revolution Health & Wellness 7% GHK Cu Accelerant Can You Start with 100mg of Gck Cu TikTok GHK Cu isn't just' a skin peptide. The gene expression data is why it keeps showing up in longevity reviews. Follow @lebaneselabs for daily peptide research.