GHK Cu Peptide: What It Does for Body Composition and Metabolic Health Copper Peptides vs Retinol Can You Use Copper Peptides With Retinol? Same GHK Cu. Better way. Same GHK Cu copper peptide complex. Completely different experience. If you've been eyeing the pen, put it down. We made something better, and your skin barrier will thank you Breaking: more people are starting to explore copper peptides over retinol Not because retinol is bad but because people are beginning to understand how different ingredients actually work. GHK Cu is something your