superPeptide 1% GHK Copper Peptide Serum Pure & Cimple 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 How Do GHK Cu And Retinol Work Together For Maximum Results? 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 Copper Peptides vs. Retinol: Which Anti Aging Powerhouse is Right for Pure & Cimple Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy