AHK Cu vs GHK Cu Difference Between GHK Cu and AHK Cu Switch Nutrition Hair and Skin Supplement with GHK Cu Peptide Collagen Supplements.co.nz GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Viral claim says GHK Cu reset nearly 4,000 genes to a younger state and increased collagen production in a preclinical study. This refers to research on GHK Cu, a naturally occurring copper binding peptide that