GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml) Copper CP Serum Let's talk copper peptides We get asked this all the time: What's the difference between GHK and CP Serum? Here's your quick guide: GHK (first generation) Beautiful blue serum Amazon.com: Super CP Serum by Skin Biology 4 oz. Copper Peptide Serum for Fine Lines and Wrinkles Anti aging look young again : Beauty & Personal Care GHK Cu Tripeptide 5 mg 60 Sublingual Tablets SuperSmart 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