Retinol Vs Peptides Which Is Better? Science Becomes Her 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 Peptides vs. Retinol Which is Better For Skin Health? Why You Shouldnt Mix GHK Cu with AHA, BHA, or Retinol If youre using a GHK Cu (Copper Peptide) in your skincare routine, layering it with strong actives like AHA, BHA, or retinol may actually reduce