Introduction GHK Cu is a copper peptide complex formed from the tripeptide glycyl L histidyl L lysine bound to copper. This compound has garnered significant attention in both laboratory and formulation research due to its critical role GHK CU Copper Peptide Face Serum Robyn's Tack Room ROBYN'S TACK ROOM GHK Cu 100mg Nova Life Peptides GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health