GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not