Can You Use GHK Cu Peptides with Vitamin C Serum? Expert Guide Copper Peptide (GHK Cu) Pro Skin Care Serum with Hyaluronic Acid If you're playing with raw GHK Cu, here's the secret that makes it actually work on your skin: mix it with hyaluronic acid. Not microneedling, not fancy devices just a clean 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