What Is GHK Cu? The Trending Copper Peptide Everyone Is Talking About Parlor Beauty I was super skeptical because I've literally tried everything Retinol destroyed my skin. Vitamin C oxidized and stung. Four different peptide serums and nothing actually worked. Then I tried GHK Cu. 6 weeks Copper Peptide Duo GHK Cu Anti Aging Serum & Moisturizer Copper peptides explained what are the differences between copper peptides and GHK CU peptides? What they actually do for the skin in terms of repair and collagen, and what you can and cant mix How Do GHK Cu And Retinol Work Together For Maximum Results?