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 Copper Peptide GHK Cu Face Serum RegenMed Direct Intensive Anti Aging Serum with Copper Peptide(GHK Cu) and Hyaluronic Acid 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.,