Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference Copper Peptides vs Retinol Can You Use Copper Peptides With Retinol? GHK Cu Troche Strive Pharmacy Copper Peptides & Retinol Can They Be Used Together? Yes, you can use Copper Peptides & Retinol just be smart about it! Retinol = speeds up cell renewal Copper peptides = support Serums St. Croix Products