Copper Peptides vs Retinol: Do You Need Both? Nubeean Noosa Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Copper Peptides vs Retinol Can You Use Copper Peptides With Retinol? Retinol vs. GHK Cu Two key ingredients used to address visible signs of ageing. Retinol A popular synthetic molecule that accelerates cellular turnover and skin resurfacing, helping to promote even skin