Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb 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 Peptide: Benefits for Tissue Repair, Healing, and Recovery Revolution Health & Wellness Copper Peptide Skincare Routine: How to Layer Peptides Glimmer Goddess GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B