There is no definitive answer as to whether retinol vs peptides are better for anti aging. However, there is a lot more research backing retinol as an effective ingredient, while peptides are still GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 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 Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 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 Can You use Copper Peptides and Retinol Together? Neurogan Health