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 (InfiniWell) GHK CU Cosmetic for Healthy Skin Aging and Wrinkle Support Pure Prescriptions GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb Just wrapped up a 12 week run with GHK Cuand the results were , Smoother, healthier looking skin (felt tighter, more refreshed) Thicker, stronger hair over time Faster recovery from workouts