The Benefits & Risks of GHK Cu (WATCH BEFORE TAKING) The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline The Human Tripeptide GHKCu in Prevention of Oxidative Stress and Degenerative Conditions of Aging: Implications for Cognitive Health Pickart 2012 Oxidative Medicine and Cellular Longevity Wiley Online Library GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective?