GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Most people think skincare works at the surface level. But healthy skin function starts much deeper than a temporary glow. GHK Cu is a naturally occurring copper binding tripeptide that is already found Tripeptides Ghk and GhkCu modified silver nanoparticles for enhanced antibacterial and wound healing activities ScienceDirect Copper, Collagen, and Controversy: Inside the GHK Cu Buzz