GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Copper Fusion Cream Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 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 Copper Peptide GHK Cu Tripeptide 1