GHK Cu Copper Peptide Supplement, Promotes Skin Repair, Reduces Wrinkles eBay What Is GHK Cu? The Copper Peptide That Rejuvenates Skin Unlock the power of GHK CU This advanced peptide is known for supporting collagen production, improving skin texture, and promoting a smoother, more radiant complexion. From fine lines and uneven tone to 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