For Research Use Only. Not for human consumption. The following summarizes published preclinical literature for laboratory research purposes only.
What It Is
GHK-Cu is a naturally occurring tripeptide-copper(II) complex composed of glycyl-L-histidyl-L-lysine (GHK) bound to a copper ion. It was first isolated from human plasma and identified as a growth-factor-like molecule for differentiated cells; it is classified in the research literature as a copper-binding tripeptide with broad reported effects on gene expression and extracellular matrix (ECM) biology (Pickart & Margolina, Int J Mol Sci, 2018).
Summary of Published Research Findings
A widely cited in vivo study published in the Journal of Clinical Investigation (1993) examined GHK-Cu using a subcutaneous wound-chamber model in rats. Sequential injection of GHK-Cu into implanted wire-mesh wound chambers produced a concentration-dependent increase in dry weight, DNA, total protein, collagen, and glycosaminoglycan content compared to saline controls. Type I and type III collagen mRNA were both increased, while a structurally similar control tripeptide (L-glutamyl-L-histidyl-L-proline) had no significant effect — supporting a sequence-specific action of GHK-Cu on connective tissue accumulation (Maquart et al., J Clin Invest, 1993).
Later gene-expression profiling research used microarray analysis to characterize GHK-Cu’s broader transcriptional effects in human cell and tissue models, reporting modulation of gene clusters associated with antioxidant defense, DNA repair, anti-inflammatory signaling, and extracellular matrix remodeling. This review work catalogued over 4,000 genes with GHK-responsive expression changes, proposing the peptide as a pleiotropic signaling molecule rather than a single-pathway agent (Pickart & Margolina, 2018).
Additional in vitro dermal fibroblast research has examined GHK-Cu’s effects on procollagen and matrix metalloproteinase (MMP) expression, reporting that the peptide-copper complex can both stimulate collagen/glycosaminoglycan synthesis and modulate MMP activity in cultured skin cell models, consistent with a dual synthesis-and-remodeling role in connective tissue research.
Proposed Mechanism of Action
The literature proposes that GHK-Cu acts through multiple mechanisms: as a copper-ion delivery/chelation system influencing copper-dependent enzymes such as lysyl oxidase, which cross-links collagen and elastin; as a modulator of gene transcription affecting extracellular matrix protein synthesis and matrix metalloproteinase balance in fibroblast research models; and as a signaling peptide with reported antioxidant and anti-inflammatory transcriptional effects observed in cell-based gene expression studies.
Research Use Only / Handling Note
GHK-Cu for laboratory research is supplied as a lyophilized powder. Strictly for qualified laboratory research; not for human or veterinary use.