Copper Peptides for Effective Hair Growth Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience Amazon.com : Bloom Clinically Proven Copper GHK CU Peptide Hair Serum for Hair Growth Multi Copper Peptides Non Greasy & Lightweight for Thinning Hair Promotes Fullness, Reduces Shedding Made in USA : GHK Cu Copper Peptide 0.5% (topical foam) One of my favorite peptides is GHK Cu. It has made such a dramatic impact on my skin in just one cycle I've been shocked! It supports collagen, healing, and overall skin