GHK Cu (copper peptide) used topically is one of the most well studied skin repair peptides. Here's how it helps the skin, in practical terms: 1. Boosts collagen & elastin GHK Cu signals your skin Some people notice their skin looks worse before it improves with GHK Cu. This temporary phase is often called the copper uglies. #skincare #ghkcu #skinhealth #longevity #peptides Does GHK Cu Really Work? 40 Years of Research Reviewed BPC 157 vs TB 500 vs GHK Cu Inside the GLOW Protocol Revolution Health & Wellness Intermediate Cu(II) Thiolate Species in the Reduction of Cu(II)GHK by Glutathione: A Handy Chelate for Biological Cu(II) Reduction Inorganic Chemistry