GHK-Cu is a naturally occurring copper-binding tripeptide, glycyl-L-histidyl-L-lysine complexed with copper(II), that has been studied for decades in cell culture and animal models of tissue repair. It is one of the most frequently investigated small peptides in skin and connective-tissue research. This guide summarizes what GHK-Cu is, which mechanisms researchers have explored, and how the lyophilized material is typically handled in the lab.
What is GHK-Cu?
GHK is a tripeptide made of three amino acids: glycine, histidine and lysine. It was first identified as a component of human plasma, and it has a strong affinity for copper(II) ions. When the peptide and copper are bound together, the resulting complex is called GHK-Cu, and it appears in cosmetic ingredient naming as copper tripeptide-1. The copper ion is held mainly by nitrogen atoms from the glycine and histidine residues, forming a compact and stable complex.
Because it is so small, GHK-Cu is often used as a model compound for studying how short peptides and trace metals interact with cells. Published work has reported that circulating GHK levels are lower in older individuals than in younger ones, which is one reason the peptide has drawn attention in aging and skin research.
GHK-Cu is not an approved medicine in the US. PRIME supplies GHK-Cu as a research compound for laboratory use only.
How GHK-Cu works: mechanism studied in research
Researchers have looked at GHK-Cu through several lenses. The most consistent theme is its role as a copper carrier. Copper is a cofactor for enzymes involved in connective-tissue formation and antioxidant defense, including lysyl oxidase and superoxide dismutase. GHK binds copper and has been proposed to deliver it to cells in a controlled, non-toxic form, which is one suggested basis for the effects observed in tissue models.
Beyond copper transport, studies in cultured fibroblasts have investigated how GHK-Cu influences the production of extracellular matrix components such as collagen, elastin and glycosaminoglycans. Other work has examined its interaction with matrix metalloproteinases and their inhibitors, the enzyme systems that break down and rebuild tissue. The general picture is that GHK-Cu appears to take part in signaling around both matrix building and matrix remodeling rather than acting on a single receptor.
A further line of investigation uses gene-expression data. Computational analyses have associated GHK with changes in the expression of a large number of genes, including genes linked to tissue repair, inflammation and antioxidant responses. These findings are hypothesis-generating: they describe associations in datasets and cell models, not established effects in people.
- Copper binding: high affinity for copper(II), studied as a copper delivery mechanism.
- Extracellular matrix: investigated for effects on collagen and related matrix proteins in cell culture.
- Remodeling enzymes: examined for interactions with metalloproteinase activity.
- Gene expression: explored in computational and in vitro expression studies.
Areas of GHK-Cu research
Published work on GHK-Cu spans basic biology and applied models. Common areas include:
- Wound healing and skin repair in rodent and other animal models
- Fibroblast behavior and collagen synthesis in cell culture
- Dermal remodeling and skin aging, including topical formulation studies
- Hair follicle biology in in vitro and animal models
- Antioxidant and anti-inflammatory signaling in cell models
- Copper transport and trace-metal biochemistry
- Gene-expression profiling and computational biology
The bulk of this literature is preclinical. GHK-Cu has not been approved by the FDA as a treatment for any condition, and results from cell and animal models should not be read as evidence of effects in humans.
GHK-Cu key facts
| Property | Detail |
|---|---|
| Class | Copper-binding tripeptide (peptide-metal complex) |
| Sequence | Gly-His-Lys (GHK) complexed with copper(II) |
| Other names | Copper peptide, copper tripeptide-1, glycyl-L-histidyl-L-lysine copper |
| Form supplied | Lyophilized powder in a sealed vial; the copper complex typically gives it a blue color |
| Research status | Research compound; not an FDA-approved medicine |
| Main research areas | Tissue repair, skin biology, extracellular matrix, gene expression |
| Storage | Lyophilized: cold, dry and dark. Reconstituted: refrigerated and protected from light |
Handling and storage of GHK-Cu in the lab
Like most research peptides, GHK-Cu is shipped as a lyophilized (freeze-dried) powder because the dry form is far more stable than a solution. Unopened vials are best kept cold, dry and away from light. Many labs store lyophilized peptides in a freezer for longer holding periods and in a refrigerator for material that will be used soon.
For experiments that call for a solution, researchers commonly reconstitute with bacteriostatic water using sterile technique:
- Let the vial reach room temperature before opening to limit condensation.
- Wipe the stopper with an alcohol swab.
- Add the diluent slowly down the inside wall of the vial rather than directly onto the powder.
- Swirl gently until dissolved; avoid vigorous shaking.
- Label the vial with the date and concentration used in your experiment, and store it refrigerated and protected from light.
Copper complexes can be affected by strong chelating agents and extreme pH, so avoid combining GHK-Cu with other reagents in the same vial unless that is part of the experimental design. A color change or visible particles are signs that the material should be checked before use.
Quality and lab results
For small peptides like GHK-Cu, identity and purity matter because degradation products or excess free copper can confound results. Every PRIME batch has a published certificate of analysis, and you can view the COA for each batch on our lab results page. A COA generally reports identity confirmation, typically by mass spectrometry, and purity, typically by HPLC. Before starting work, match the batch or lot number on your vial to the report and keep a copy with your lab records.
Related research
GHK-Cu is often discussed alongside other peptides studied in tissue-repair models. For a side-by-side view, see GHK-Cu vs BPC-157. You may also find the BPC-157 research guide and the TB-500 research guide useful, since both compounds are investigated in overlapping wound-healing and connective-tissue models.
GHK-Cu FAQ
What is GHK-Cu used for in research?
GHK-Cu is studied in cell culture and animal models of wound healing, skin remodeling, collagen synthesis, copper transport and gene expression. It is supplied for laboratory research only and is not approved to treat any condition.
Is GHK-Cu the same as copper peptide?
In most contexts, yes. Copper peptide usually refers to GHK-Cu, the copper(II) complex of the tripeptide Gly-His-Lys. The cosmetic ingredient name for the same complex is copper tripeptide-1.
Why is GHK-Cu powder blue?
The blue color comes from the bound copper(II) ion. A consistent color is expected for the complex, while an unexpected change in color after reconstitution can be a sign that the material should be checked.
Is GHK-Cu FDA approved?
No. GHK-Cu is a research compound and is not an FDA-approved medicine. PRIME sells it for laboratory research use only.
How should GHK-Cu be stored?
Lyophilized GHK-Cu is typically kept cold, dry and away from light. Once reconstituted for lab use, solutions are generally kept refrigerated, protected from light and used within the period defined by the lab's own procedures.
For laboratory research use only. Not for human consumption. Not a drug, food or cosmetic.