GHK Cu Copper Peptide Neck & Face Serum GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true? Copper peptide, known as GHK Cu, has am+pm 5% B5+GHK Cu Hydrating Serum GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? Snapklik.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