Can I use Retinoids with Vitali GHK Cu Copper Peptides? How do I get t Vitali Skincare 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 Copper Peptides vs Retinol: Do You Need Both? Nubeean Noosa Copper Peptides for Skin: What GHK Cu Does and How It Compares to Retinol Copper Peptides vs Retinol Can You Use Copper Peptides With Retinol?