Molecular crystal structure of the tripeptide GHK Cu. In solution, Download Scientific Diagram GHK CU VIBRANCY MICRONEEDLING KIT LUX LAB GHK CU GHKCu (glycyl L histidyl L lysine copper) is a naturally occurring copper peptide found in the human body, particularly in plasma, saliva, and urine. It plays a key role in skin regeneration by promoting GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration