Copper Peptides + Vitamin C and Retinol? Heres How to Layer Them! , GHK Cu works wonders for collagen production, but how do you pair it with other skincare powerhouses like Vitamin C or Retinol? Copper Peptides in Skincare: Benefits, Science & How to Use GHK Cu Scalp Solution Empower Pharmacy Heres how to use retinol with copper peptides correctly Yes, you can use both but timing matters. Option 1 (Beginner Friendly): AM Copper peptides (repair + calm) PM Retinol (renew + Copper Peptides for Skin: What GHK Cu Does and How It Compares to Retinol