GHK-Cu
Naturally present in the body, GHK-Cu has been studied for several decades for its links with tissue repair, the extracellular matrix and certain regeneration processes.
- Research Use Only
- Molecule under study
- Living document
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- Current research state
- Used in topical cosmetics; laboratory and animal research is ongoing, while evidence for effects throughout the human body remains limited.
- Current clinical phase
- Targeted clinical studies of skin and wound healing; no broad drug-development programme
- Last update
- 21 July 2026 · Reference fact sheet v1.0
- Living document
- Updated regularly as research progresses.
What is GHK-Cu?
GHK is a short peptide made of three amino acids: glycine, histidine and lysine. Loren Pickart first isolated it from human blood plasma in 1973.
Its concentration in blood plasma has been reported to fall with age (roughly 200 ng/mL at 20 versus 80 ng/mL around 60). This has prompted questions about its role in tissue repair, not proved a benefit from adding it.
When GHK binds a copper (II) ion, it forms GHK-Cu. This copper-bound form is the one most often studied for biological effects.
Names you may come across
This molecule may appear under several names in the scientific, clinical or technical literature. Here are the main designations you may come across.
The usual name in scientific and cosmetic literature.
The INCI ingredient name used on cosmetic labels.
A common commercial name, especially for products applied to the skin.
Understanding it simply
Three simple points to understand GHK-Cu.
A small peptide with wide-ranging effects in the lab
Despite having only three amino acids, GHK has been shown to affect the activity of many genes in laboratory studies of skin and connective-tissue cells.
A link to copper
Several enzymes in the skin need copper to work. Researchers are studying whether GHK-Cu helps carry copper to tissues.
A history in cosmetics
GHK-Cu has appeared in skin-applied cosmetic products since the 1980s. This is its best-documented area of use.
What research shows today
Science advances step by step. We clearly distinguish what is firmly established from what remains under study.
- First isolated from human blood plasma by Loren Pickart in 1973. — established
- GHK's strong ability to bind copper (II) is documented. — established
- Laboratory studies show effects on the production of collagen, elastin and other support materials by fibroblasts, the cells that help maintain tissue. — established
- Changes in gene activity have been described in several studies, including Connectivity Map research in 2010. — established
- Effects throughout the human body after injection have not been well studied in randomized clinical trials. — ongoing
Known since 1973 and widely studied in cells and animals. Topical cosmetic use is documented; effects throughout the body remain a research question.
What the research shows
- In cell studies, GHK-Cu affects fibroblasts and their production of collagen, elastin and other tissue-supporting materials.
- Improved wound healing has been observed in several animal models, including rodents, pigs and rabbits.
- Antioxidant and anti-inflammatory effects have been reported in cell studies.
- Topical cosmetic use is established and was generally well tolerated in the published studies.
What still remains to be studied
- The size of any effects throughout the human body after injection: few randomized clinical trials are available.
- How the body absorbs, distributes and clears it is not yet fully understood.
- The long-term effects of repeated external exposure in humans have not been established.
What we know today
Not all information carries the same weight of evidence. We therefore present it across three clearly distinct levels, from the most solid to the most indicative.
What scientific publications show
Scientific evidence- Preclinical studies suggest a role in tissue repair, including wound healing and the material supporting cells.
- Cosmetic studies report measurable changes in skin quality after repeated application to the skin.
- Gene-expression studies suggest that GHK-Cu may affect several processes inside cells.
What some professionals report
Documented- Dermatologists and cosmetic formulators have used GHK-Cu as a documented skin-care ingredient for decades.
- Researchers note that it does not replace medical treatment for complex wounds.
What the community reports
Field observations- Personal accounts mostly concern skin-applied products, such as perceived changes in skin appearance or scars.
- Individual observations cannot replace controlled clinical evidence.
The evidence is uneven: substantial for laboratory and topical cosmetic research, much more limited for injected use in humans.
How does GHK-Cu work?
Researchers study GHK-Cu both as a biological signal and as a carrier of copper.
- Fibroblasts
- Possible effects on the production of collagen, elastin and other tissue-supporting materials.
- Copper (II)
- Possible transport of copper to tissues, where some enzymes use it.
- Inflammation pathways
- Changes in the activity of genes linked to inflammation in gene-expression studies.
- Repair pathways
- Changes in patterns of gene activity linked to wound healing and tissue remodelling.
These mechanisms have mostly been studied in cells and animals. We do not yet know how closely the findings apply to humans.
Clinical trials timeline
A molecule under study progresses step by step. Here, simply, is where the research currently stands.
- Discovery· 1973Completed
Isolation by Loren Pickart
GHK is identified in human blood plasma during research on liver cell function.
- Research· 1980sCompleted
Characterization of the GHK-Cu complex
Studies describe how GHK binds copper and interacts with fibroblasts, cells involved in tissue repair.
- Cosmetic· 1990sCompleted
Topical use in cosmetics
GHK-Cu is included in skin-care formulations, with generally favourable tolerability reported.
- Research· 2010Completed
BMC Genomics gene-expression study
Pickart and colleagues publish research describing broad changes in gene activity using Connectivity Map data.
- Ongoing· CurrentlyOngoing
Targeted preclinical and clinical research
Research continues into wound healing, skin and other targeted applications; randomized trials of effects throughout the body remain scarce.
Available analyses
Analytical documents provided by suppliers and published for GHK-Cu, available in the Analysis Library. They document batch traceability and are not an independent analysis performed by PHL.
Open the analysis libraryFrequently asked questions
Is GHK-Cu a medicine?
No. It is used as a cosmetic ingredient in many countries and remains a subject of research. PHL does not suggest therapeutic use.
Why are some formulations blue or violet?
The colour comes from the copper (II)–peptide complex in solution.
Do skin-applied and injected GHK-Cu have the same effects?
We do not know. Topical use has more evidence, while human evidence for injected use is limited. Findings from one route cannot simply be applied to the other.
What side effects have been described?
Topical products are generally well tolerated in published studies, although irritation can occur. Long-term safety of exposure throughout the body has not been established.
Does GHK really decrease with age?
Several studies have measured a gradual decline in blood-plasma GHK with age. What that decline means for health remains debated.
Scientific publications
Selected GHK-Cu publications covering basic science, preclinical studies and skin applications. This reading list may be updated as research develops.
Tripeptide in human serum which prolongs survival of normal liver cells and stimulates growth in neoplastic liver
Pickart L., Thaler M. M. · Nature New Biology · 1973
Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+
Maquart F. X. et al. · FEBS Letters · 1993
Glossary
- Tripeptide
- A chain of three amino acids, the building blocks of proteins.
- Fibroblast
- A connective-tissue cell that makes collagen and other material supporting nearby cells.
- Extracellular matrix
- A network of proteins, including collagen and elastin, that supports cells.
- Chelation
- When a molecule binds a metal ion, in this case copper.
- Transcriptomics
- The study of messenger RNA, which helps show which genes are active in a cell.
- INCI
- The international naming system for cosmetic ingredients.
Continue your discovery
Read next
Sheets that are thematically close. These links serve reading and discovery — they suggest no combined use.
Reference fact sheet — version 1.0, updated on 21 July 2026. The full regulatory and scientific framework is gathered in the “Important information” box at the top of the fact sheet.
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This general content is independent of the molecule and is neither a use strategy nor a protocol.