GHK Cu Copper Peptide Neck & Face Serum Copper Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience 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 Throne Ghk Cu Topical 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 AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan