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 InfiniWell, GHK CU, 30 ml GHK Cu Scalp Solution Empower Pharmacy Ghk Cu Experienxe : r Peptides Thermodynamically stable ionic liquid microemulsions pioneer pathways for topical delivery and peptide application ScienceDirect What Is GHK Cu? How It Works in Research and Quality Signals