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 Did you know that Tretinoin can damage GHK Copper Peptides?. If you use Tret at night, save your GHK Lux for the morning. , Get the full safety guide on our YouTube Channel!, #platinum_skin_care Copper Peptides for Skin: What GHK Cu Does and How It Compares to Retinol GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Adobe Express file (13).png Copper Peptides vs Retinol Can You Use Copper Peptides With Retinol?