GHK-Cu (Copper) Peptide

GHK-Cu is a naturally occurring copper-binding peptide composed of three amino acids—glycine, histidine, and lysine (glycyl-L-histidyl-L-lysine).(1) The “Cu” designation refers to the incorporation of a copper ion into the peptide structure. GHK-Cu is a small tripeptide found in plasma and is reported to be released in response to tissue injury. Its concentration appears to decline with age, with average levels decreasing from approximately 200 ng/mL at age 20 to around 80 ng/mL by age 60.(1)

Research has suggested that when GHK is introduced into cell cultures in nanomolar concentrations, it may induce a broad range of biological responses, from cellular growth stimulation to differentiation effects.(4) During its isolation, the peptide was observed to possess chelating properties, with the ability to bind metal ions such as copper and, to a lesser extent, iron. Studies indicated that when GHK was present as a complex bound to copper—and in some cases iron—it exhibited enhanced biological activity, suggesting that its interaction with these metal ions may be central to its functional potential.

Overview

Studies(5) have suggested that GHK-Cu may influence gene expression and potentially contribute to the resetting of certain genomic elements. Through this proposed mechanism, the peptide may support the restoration of impaired or dysfunctional cells, including those associated with conditions such as carcinogenic changes and chronic obstructive pulmonary disease (COPD).

GHK-Cu has been investigated across a broad range of biological functions.(1) Research suggests it may support the integrity of aging skin by tightening and improving thinning structures, as well as contributing to the maintenance of the extracellular matrix. It has also been associated with restoration of the skin barrier and improvements in texture, hyperpigmentation, and lesions. Additional findings indicate potential roles in supporting tissue repair, modulating inflammation, promoting increases in hair follicle size, and exerting antioxidant effects. Collectively, these observations have led to the suggestion that GHK-Cu may also possess gene-regulatory or restructuring potential.

Specifications:

  • Molecular Formula: C14H23CuN6O4

  • Molecular Weight: 340.38 g/mol

  • Other Known Titles: glycyl-L-histidyl-L-lysine-copper 2+

Research and Clinical Studies
GHK Peptide Initial Research

A study conducted in the 1980s(6) explored the biological potential of the naturally occurring GHK peptide in tissue repair. The findings suggested that GHK may bind copper (II) ions due to its affinity for copper, forming a complex that could stimulate collagen synthesis and increase the accumulation of proteins and DNA at sites of injury. In this study, dermal wounds were induced in rat models, which triggered the release of GHK as part of the body’s immediate response. These so-called “emergency response molecules” were released from the extracellular matrix at the injury site. Once released, GHK appeared to bind circulating copper ions and subsequently stimulate the production of decorin, a protein involved in collagen formation, wound healing regulation, and potential anti-tumour defence mechanisms.

Further research conducted in the 2000s(7) suggested that GHK-Cu may extend its effects beyond collagen synthesis by also promoting the production of tissue inhibitors of metalloproteinases, specifically TIMP-1 and TIMP-2. These molecules are considered important in regulating tissue remodelling and maintaining extracellular matrix integrity, supporting the peptide’s proposed role in tissue repair and structural regeneration.

GHK Peptide and Tissue Repair

In one study,(8) the primary objective was to evaluate the effects of the GHK-Cu peptide complex on open wound healing in comparison to zinc oxide. A total of 18 New Zealand white rabbits were used and divided into three groups: one treated with GHK-Cu, another with zinc oxide, and a control group receiving a placebo. Standardised wounds were induced in all subjects, and treatments were applied over a 21-day period. At the conclusion of the study, researchers suggested that the group treated with GHK-Cu demonstrated improved healing outcomes compared to both the zinc oxide and placebo groups.

In another study,(9) researchers compared the effects of the GHK-Cu peptide complex with helium–neon laser therapy, applied at energy levels of 1 J/cm² and 3 J/cm². This study involved 24 New Zealand white rabbits, also divided into three groups, each receiving either GHK-Cu or varying laser treatments. Experimental wounds were created, and the subjects were monitored over 28 days. Findings indicated that rabbits treated with GHK-Cu, as well as those receiving higher-intensity laser therapy, showed enhanced wound healing responses compared to other groups. Specifically, the GHK-Cu group exhibited a reduction in neutrophil counts and an increase in neovascularisation, suggesting potential anti-inflammatory and pro-angiogenic effects.

GHK Peptide and Metastasis

In a 1983 study,(1) researchers examined the effects of a combination of the GHK-Cu peptide complex and ascorbic acid (vitamin C) on tumour cell growth. A total of 180 mice with cancerous growths were exposed to this mixture. The findings suggested that the combination may contribute to a reduction in the growth rate of carcinogenic cells within the experimental models.

Further analysis indicated that the GHK-Cu complex may influence gene expression related to apoptosis and DNA repair. Specifically, the peptide appeared to increase the expression of caspases and associated genes involved in programmed cell death. In experimental settings, GHK-Cu was observed to suppress the growth of certain cancer cell lines, including SH-SY5Y neuroblastoma cells and U937 histiocytic lymphoma cells. These observations were supported by evidence of activation within apoptosis pathways, particularly involving caspases 3 and 7, which are key regulators of cell death processes.

In contrast, studies involving non-cancerous cells suggested that GHK may promote cellular growth. For example, the peptide appeared to enhance the proliferation of NIH-3T3 fibroblasts, which are commonly used as a model for studying normal cell division and tissue repair. These findings highlight a differential effect, where GHK-Cu may inhibit the growth of malignant cells while supporting the activity of healthy cells under experimental conditions.

GHK Peptide and Ulcers

This clinical study(10) was conducted in diabetic subjects presenting with neuropathic ulcers. All participants were managed under a standard wound care protocol, with only those exhibiting sharp ulcer wounds or undergoing debridement included in the randomised, placebo-controlled trial. The investigation utilised a GHK-Cu peptide complex in gel form. Subjects were divided into groups, with one group receiving the peptide gel while the control group continued standard care alongside a placebo application.

Following the study, researchers reported that the group treated with the GHK-Cu gel demonstrated significantly higher healing outcomes, with reported healing rates exceeding 98%. Specifically, the peptide gel appeared to facilitate closure in approximately 98.5% of plantar ulcers, compared to around 60.8% observed in the control group. These findings suggest a potential role for the GHK-Cu complex in enhancing wound healing within this clinical context.

GHK Peptide and Behavioral Properties

In one study,(1) GHK-Cu was administered to murine models to evaluate its potential effects on pain response. The mice were placed on a moderately heated surface, a condition that typically increases the time taken for them to react, such as licking their paws due to discomfort. Following administration of the peptide, the time taken for this response was observed to decrease compared to control conditions. Researchers suggested that the presence of GHK-Cu may have contributed to a reduction in perceived discomfort, allowing the mice to respond more quickly.

In another study,(11) male rats were placed in an experimental maze designed to induce anxiety-related behaviour. Typically, anxious rats tend to remain in enclosed or “closed arm” areas, while increased time spent in “open arms” is associated with reduced anxiety levels. After administration of the peptide, researchers monitored the time spent in open-arm regions and reported that GHK-Cu appeared to increase this behaviour, suggesting a potential anxiolytic-like effect.

In a further experiment,(12) two rats were placed together in a confined space and subjected to mild electric stimulation, which commonly induces agitation and aggressive behaviour. Prior to this exposure, both rats were administered GHK-Cu. The results indicated that the frequency of aggressive interactions was reduced by approximately fivefold compared to typical responses, suggesting a potential modulatory effect of the peptide on stress-induced aggression.

GHK-Cu and Antioxidative potential

A study(13) investigated the potential of glycyl-L-histidyl-L-lysine (GHK) to regulate levels of reactive oxygen species (ROS) within laboratory cell models, with particular focus on its ability to mitigate oxidative stress. GHK has been proposed to function as an endogenous antioxidant, potentially through selective targeting and neutralisation of specific free radicals, including hydroxyl (·OH) and peroxyl (ROO·) radicals.

The antioxidant activity of GHK was evaluated using techniques such as flow cytometry, which analyses cellular characteristics, and electron spin resonance (ESR) spin-trapping, a method used to detect and measure free radicals. During these assessments, GHK appeared to reduce ROS levels induced by tert-butyl hydroperoxide (t-BOPD), a compound commonly used to generate oxidative stress in experimental models. ESR findings indicated that GHK demonstrated a notable capacity to reduce concentrations of hydroxyl and peroxyl radicals, while showing comparatively limited activity against superoxide (O₂⁻·) radicals.

Further comparative analysis using ESR examined GHK’s ability to neutralise hydroxyl radicals relative to other known antioxidants, such as carnosine and reduced glutathione (GSH). Preliminary results suggested that GHK may exhibit a stronger capacity to neutralise hydroxyl radicals compared to these compounds, supporting its proposed role as a potentially effective antioxidant in cellular systems.

GHK-Cu and Antioxidative potential

A study(14) examined the potential mechanisms through which the GHK-Cu peptide complex may exert anti-inflammatory effects, particularly in the context of lung inflammation induced by cigarette smoke (CS). It was proposed that GHK-Cu may influence multiple biochemical pathways and molecular markers associated with inflammation and oxidative stress, although the precise mechanisms remain to be fully clarified. In murine models exposed to cigarette smoke, GHK-Cu administration was associated with a reduction in pro-inflammatory cytokines such as interleukin-1β (IL-1β) and tumour necrosis factor-α (TNF-α) within bronchoalveolar lavage fluid, suggesting a potential role in moderating smoke-induced inflammatory responses.

The study also reported a decrease in myeloperoxidase (MPO) activity in lung tissue following GHK-Cu exposure. As MPO is a marker of neutrophil-driven inflammation and oxidative stress, this finding may indicate that the peptide complex could limit neutrophil activation and associated oxidative damage. At the molecular level, GHK-Cu was proposed to interact with the nuclear factor kappa B (NF-κB) signalling pathway, a key regulator of inflammatory responses. Specifically, the peptide may inhibit NF-κB activation by influencing the phosphorylation state of IκBα, an inhibitory protein, potentially resulting in reduced expression of inflammation-related genes.

Additionally, the study suggested that GHK-Cu may affect the nuclear factor erythroid 2-related factor 2 (Nrf2) pathway, which plays a central role in cellular defence against oxidative stress. GHK-Cu was associated with increased expression and nuclear translocation of Nrf2, which may enhance the activation of genes involved in antioxidant defence. Further observations included a reduction in malondialdehyde (MDA) levels—a marker of lipid peroxidation—and a restoration of glutathione (GSH) levels, an essential intracellular antioxidant. Together, these findings suggest that GHK-Cu may contribute to reducing oxidative stress and inflammation through modulation of key cellular pathways, although further research is required to confirm these effects.

GHK-Cu and Lipid Peroxidation

A theoretical model suggests that GHK may play a role in regulating the release of iron from ferritin.(15) Ferritin is a protein complex responsible for storing iron, and when released in certain forms, iron may contribute to lipid peroxidation—a process in which free radicals damage lipids within cell membranes. It has been proposed that GHK could inhibit the formation of reactive iron complexes within injured tissues, potentially reducing downstream inflammatory responses.

Further exploration indicates that GHK may interact with biological pathways involved in controlling ferritin-mediated iron release. Through this interaction, it is hypothesised that GHK could significantly limit iron mobilisation—potentially by as much as 87%, although this estimate remains preliminary. A reduction in available free iron may, in turn, help decrease both inflammation and oxidative stress, conditions that arise when reactive processes outpace the body’s antioxidant defences within affected tissues.

GHK-Cu peptide is available for research and laboratory purposes only. Please speak to our friendly research team to find out more and for sourcing options.

References:

  1. Pickart, Loren, and Anna Margolina. “Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data.” International journal of molecular sciences vol. 19,7 1987. 7 Jul. 2018, doi:10.3390/ijms19071987.  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073405/

  2. Pickart L, Freedman JH, Loker WJ, Peisach J, Perkins CM, Stenkamp RE, Weinstein B. Growth-modulating plasma tripeptide may function by facilitating copper uptake into cells. Nature. 1980 Dec 25;288(5792):715-7. doi: 10.1038/288715a0. PMID: 7453802.   https://pubmed.ncbi.nlm.nih.gov/7453802/

  3. L.O. Pilgeram, L.R. Pickart, Control of fibrinogen biosynthesis: The role of free fatty acid, Journal of Atherosclerosis Research, Volume 8, Issue 1, 1968, Pages 155-166, ISSN 0368-1319,  https://doi.org/10.1016/S0368-1319(68)80089-4

  4. Pickart L, Freedman JH, Loker WJ, Peisach J, Perkins CM, Stenkamp RE, Weinstein B. Growth-modulating plasma tripeptide may function by facilitating copper uptake into cells. Nature. 1980 Dec 25;288(5792):715-7. doi: 10.1038/288715a0. PMID: 7453802.   https://pubmed.ncbi.nlm.nih.gov/7453802/

  5. Pickart L, Vasquez-Soltero JM, Margolina A. GHK and DNA: resetting the human genome to health. Biomed Res Int. 2014;2014:151479. doi: 10.1155/2014/151479. Epub 2014 Sep 11. PMID: 25302294; PMCID: PMC4180391.  https://pubmed.ncbi.nlm.nih.gov/25302294/

  6. 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 Oct 10;238(2):343-6. doi: 10.1016/0014-5793(88)80509-x. PMID: 3169264.   https://pubmed.ncbi.nlm.nih.gov/3169264/

  7. Siméon A, Emonard H, Hornebeck W, Maquart FX. The tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+ stimulates matrix metalloproteinase-2 expression by fibroblast cultures. Life Sci. 2000 Sep 22;67(18):2257-65. doi: 10.1016/s0024-3205(00)00803-1. PMID: 11045606.   https://pubmed.ncbi.nlm.nih.gov/11045606/

  8. Cangul IT, Gul NY, Topal A, Yilmaz R. Evaluation of the effects of tripeptide-copper complex and zinc oxide on open-wound healing in rabbits. Vet Dermatol. 2006 Dec;17(6):417-23. doi: 10.1111/j.1365-3164.2006.00551.x. PMID: 17083573.   https://pubmed.ncbi.nlm.nih.gov/17083573/

  9. Gul NY, Topal A, Cangul IT, Yanik K. The effects of tripeptide copper complex and helium-neon laser on wound healing in rabbits. Vet Dermatol. 2008 Feb;19(1):7-14. doi: 10.1111/j.1365-3164.2007.00647.x. PMID: 18177285.  https://pubmed.ncbi.nlm.nih.gov/18177285/

  10. Mulder GD, Patt LM, Sanders L, Rosenstock J, Altman MI, Hanley ME, Duncan GW. Enhanced healing of ulcers in patients with diabetes by treatment with glycyl-l-histidyl-l-lysine copper. Wound Repair Regen. 1994 Oct;2(4):259-69. doi: 10.1046/j.1524-475X.1994.20406.x. PMID: 17147644.  https://pubmed.ncbi.nlm.nih.gov/17147644/

  11. Bobyntsev II, Chernysheva OI, Dolgintsev ME, Smakhtin MY, Belykh AE. Anxiolytic effects of Gly-His-Lys peptide and its analogs. Bull Exp Biol Med. 2015 Apr;158(6):726-8. doi: 10.1007/s10517-015-2847-3. Epub 2015 Apr 23. PMID: 25900608.   https://pubmed.ncbi.nlm.nih.gov/25900608/

  12. Sever'yanova LА, Dolgintsev ME. Effects of Tripeptide Gly-His-Lys in Pain-Induced Aggressive-Defensive Behavior in Rats. Bull Exp Biol Med. 2017 Dec;164(2):140-143. doi: 10.1007/s10517-017-3943-3. Epub 2017 Nov 27. PMID: 29181666.   https://pubmed.ncbi.nlm.nih.gov/29181666/

  13. Sakuma, S., Ishimura, M., Yuba, Y., Itoh, Y., & Fujimoto, Y. (2018). The peptide glycyl-ʟ-histidyl-ʟ-lysine is an endogenous antioxidant in living organisms, possibly by diminishing hydroxyl and peroxyl radicals. International journal of physiology, pathophysiology and pharmacology, 10(3), 132–138.

  14. Zhang, Q., Yan, L., Lu, J., & Zhou, X. (2022). Glycyl-L-histidyl-L-lysine-Cu2+ attenuates cigarette smoke-induced pulmonary emphysema and inflammation by reducing oxidative stress pathway. Frontiers in molecular biosciences, 9, 925700.   https://doi.org/10.3389/fmolb.2022.925700

  15. Miller, D. M., DeSilva, D., Pickart, L., & Aust, S. D. (1990). Effects of glycyl-histidyl-lysyl chelated Cu(II) on ferritin dependent lipid peroxidation. Advances in experimental medicine and biology, 264, 79–84.  https://doi.org/10.1007/978-1-4684-5730-8_11

Dr. Marinov

Dr. Marinov (MD, Ph.D.) is a researcher and chief assistant professor in Preventative Medicine & Public Health. Prior to his professorship, Dr. Marinov practiced preventative, evidence-based medicine with an emphasis on Nutrition and Dietetics. He is widely published in international peer-reviewed scientific journals and specializes in peptide therapy research.

GHK-Cu (Copper) Peptide