Modulation of Fibroblast Phenotype and Collagen Synthesis by GHK Cu in Prime Lab Peptides The complex dynamics of myocardial interstitial fibrosis in heart failure. Focus on collagen cross linking ScienceDirect Full article: Physicochemical characterization of native glycyl l histidyl l lysine tripeptide for wound healing and anti aging: a preformulation study for dermal delivery 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: Four Decades of Copper Peptide Science and What Researchers Are Finding Praetorian Peptides