GHK Cu Peptide Before and After Results GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? Struggling with hair thinning or shedding? Meet GHK Cu, the topical peptide everyone is talking about and NO, it's not an injection! This powerful serum helps: Reduce shedding Injectable vs Topical Peptides: Should You Use Them for Anti Aging and Longevity? This compound has been studied for over 50 years. Most people discovered it last year on social media. In 1973, Dr. Loren Pickart identified GHK Cu while studying why young blood could