GHK Cu Topical Sky Blue Cream & Royal Blue Serum Bundle Aseir Custom GHK CU Topical Serum 30ml Azur Skin 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 Peptide (GHK Cu) Serum 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 GHK CU Topical Serum 30ml Azur Skin