GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 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 Copper Peptide (GHK Cu) 2% Recovery Serum Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference