Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with Copper Peptides vs Retinol Can You Use Copper Peptides With Retinol? 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 Diving deep into the skincare game Let's explore two powerhouses: GHK Cu (Copper Peptide) vs. Retinol. Which reigns supreme for youthful skin? Swipe right to see our post schedule as we unpack