GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 6 month GHK CU check in Main takeaway: skin transformation takes time. GHK CU peptide binds to copper and activates genes involved in wound healing, collagen synthesis, and skin remodeling. On the face, this translates 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