What is GHK Cu and Why is Everyone Talking About It? GHK Cu (Copper Peptide) is a powerful, naturally occurring compound in the body that plays a key role in skin health GHK Cu Peptide: What It Does for Body Composition and Metabolic Health The form of GHK Cu you use may matter more than the peptide itself. Which form of GHK Cu have you personally tried before and what was the FIRST noticeable change you experienced? Copper Peptides in Acne Scars