Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare GHK Cu is getting a lot of attention right now, and for good reason. This is not just a skin peptide. It's a copper binding tripeptide with documented effects on gene expression, collagen synthesis, GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu Peptide: What It Does for Body Composition and Metabolic Health