RESEARCH USE ONLY — NOT FOR HUMAN CONSUMPTION. This article is written for laboratory researchers. GHK-Cu is discussed strictly as a research compound. It is not for human or veterinary use, and nothing here is medical advice or a recommendation for use.
Discovery: a plasma factor from 1973
GHK-Cu was first isolated from human plasma in 1973 by biochemist Loren Pickart during research into plasma factors that influenced liver cell behavior in culture. The tripeptide glycyl-L-histidyl-L-lysine (Gly-His-Lys) showed strong affinity for copper(II) ions, establishing the GHK-Cu complex as a biologically relevant entity. It has since been identified in saliva, urine, and the breakdown products of collagen, and the literature reports that its plasma levels decline with age.
Fibroblast and tissue-remodeling research
One of the most cited early findings: Maquart, Pickart and colleagues reported in FEBS Letters (1988) that the GHK-Cu complex stimulated collagen synthesis in fibroblast cultures, with stimulation beginning between 10⁻¹² and 10⁻¹¹ M and maximizing at 10⁻⁹ M, independent of changes in cell number. They noted a GHK triplet in the alpha 2(I) chain of type I collagen, suggesting the tripeptide might be liberated by proteases at wound sites. This placed GHK-Cu firmly in wound-healing and tissue-remodeling research.
The gene-expression studies
In 2010, Hong, Downey, Pickart and colleagues published a microarray study in BMC Genomics that reframed the compound: exposing cultured human fibroblasts to GHK at 1 nanomolar — near physiological plasma concentration — significantly modulated the expression of 4,192 human genes, roughly 31% upregulated and 69% downregulated, spanning wound repair, antioxidant defense, anti-inflammatory pathways, DNA repair, and ubiquitin-mediated protein turnover. A 2012 analysis extended this work to genes whose expression GHK-Cu reverses in aged versus young fibroblasts.
Oxidative-stress research
Pickart’s 2012 review in Oxidative Medicine and Cellular Longevity detailed GHK-Cu’s antioxidant research profile: increased antioxidant enzyme and superoxide dismutase activity, reduced lipid peroxidation in gastric mucosa homogenates, and modulation of iron release from ferritin in damaged-tissue models. In fibroblast culture, GHK-Cu was reported to decrease pro-inflammatory cytokines including TGF-beta and TNF-alpha.
Laboratory applications
GHK-Cu is used in cell-culture supplementation studies, wound-healing model research, and gene-expression assay development. As with all research peptides, identity and purity should be verified by HPLC and mass spectrometry against a lot-specific Certificate of Analysis.
References
1. Maquart FX, Pickart L, Laurent M, Gillery P, Monboisse JC, Borel JP. Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+. FEBS Lett. 1988;238(2):343-6. — https://pubmed.ncbi.nlm.nih.gov/3169264/
2. Hong Y, Downey T, Pickart L, et al. Microarray analysis of GHK effects on human fibroblast gene expression. BMC Genomics. 2010.
3. Pickart L, Vasquez-Soltero JM, Margolina A. The human tripeptide GHK-Cu in prevention of oxidative stress and degenerative conditions of aging. Oxid Med Cell Longev. 2012. — https://onlinelibrary.wiley.com/doi/10.1155/2012/324832
All compounds discussed are for laboratory research use only. Not for human consumption. Not intended to diagnose, treat, cure, or prevent any disease.