GHK-Cu: What It Is and Why It Carries Copper
GHK-Cu is a very small peptide with a copper atom attached. It is studied as a copper carrier, because it holds the metal tightly and can also release it again. This guide explains what it is, why the copper matters, what researchers have found so far, and how the powder should be handled. Supplied for in vitro research purposes only.
5 minute read
What Is GHK-Cu?
GHK-Cu is a very small peptide with a copper atom attached to it.
The peptide part is three amino acids long. Its full name is glycyl-L-histidyl-L-lysine, which is where the letters GHK come from. The Cu is the chemical symbol for copper. Put the two together and you have GHK-Cu.
You may also see it sold as Copper Tripeptide-1. That is the cosmetics industry’s name for the same molecule.
It was first found in human blood in 1973, when researchers noticed it kept liver cells alive longer in the lab. Seven years later the same team found it almost always turned up alongside copper, at roughly one copper atom per peptide. They suggested its job was to carry copper into cells. That idea still shapes how the compound is studied today.
Are GHK, GHK-Cu and Copper Tripeptide-1 the Same Term?
GHK, GHK-Cu and Copper Tripeptide-1 are not interchangeable labels. GHK is the bare tripeptide, GHK-Cu is that tripeptide holding a copper atom, and Copper Tripeptide-1 is the ingredient name used for the copper complex in cosmetic contexts.
| Term | What it means in context | What to verify on a supplied record |
|---|---|---|
| GHK | The tripeptide glycyl-L-histidyl-L-lysine on its own. The three letters name the three amino acids, and none of them states that copper is present | Whether the record describes the bare peptide or the copper complex. Three letters do not settle it, and the two are not the same material |
| GHK-Cu | The same tripeptide holding a copper atom, at roughly one copper per peptide. Cu is the chemical symbol for copper | That the listing and the certificate both describe the copper complex, and that the amount and the format match the vial in front of you |
| Copper Tripeptide-1 | The ingredient-nomenclature name for the copper complex in cosmetic contexts. It appears on ingredient lists rather than in research papers | The actual formulation and the supplied format rather than the name. An ingredient name says what is in a product; it does not state the amount, the strength or the form it arrives in |
GLOW and KLOW are catalogue blends rather than further names for GHK-Cu. GLOW holds 3 components, and KLOW holds 4 components, and the copper tripeptide is one of them. Evidence gathered on GHK-Cu on its own is evidence about a component. It does not become direct evidence for a blend, because a study of one compound cannot say what the same material does beside three others. GLOW compared with KLOW sets the two out side by side.
Why Does It Have Copper in It?
GHK-Cu carries copper because that is the whole point of it. The peptide is the vehicle and the copper is the cargo.
GHK grabs a copper atom and holds it very tightly. One peptide, one copper atom.
Holding on tightly is not the interesting part, though. Plenty of molecules do that. Your own blood is full of them, and albumin — the most common protein in blood — grips copper even harder than GHK does.
What makes GHK unusual is that it can let go again. Under the right conditions it releases the copper it is carrying. Albumin does not. Once albumin has hold of a copper atom, it keeps it.
That difference has a name worth knowing:
- A molecule that grabs and never releases is a chelator. It locks the metal away.
- A molecule that grabs and can release is a carrier. It delivers the metal somewhere.
GHK-Cu behaves like a carrier. That is why researchers study the copper complex rather than the bare peptide or an ordinary copper salt.
What Has the Research Actually Found?
Research on GHK-Cu falls into three groups, and they are not equally strong. Keeping them apart matters, because a lot of what is written about this compound blurs them together.
| Where it was done | What was studied | What was found |
|---|---|---|
| In lab dishes | Human skin cells | The cells made more collagen when GHK-Cu was added, starting at very small amounts |
| In animals | Rats, in wound studies | More collagen built up in healing wounds, and the effect grew with larger amounts |
| In people | Creams and dressings applied to skin | Controlled studies have measured skin and wound outcomes over weeks to months |
One detail from the lab-dish work is worth pulling out. The extra collagen did not depend on how many cells were in the dish. That sounds like a technicality, but it tells you something real: GHK-Cu appears to change what cells do, rather than simply producing more cells. Researchers call it a signalling compound for that reason, not a growth compound.
The animal work is the most consistent part of the record. It came from one research programme running over several years, and the results agree with each other. It is worth knowing how it was done, though. The compound was delivered into small chambers under the skin, which is a very different situation from rubbing a cream on. Results from one do not automatically carry over to the other.
The human research is the thinnest of the three. It has been done on skin, over weeks to months.
Does It Need Special Handling?
GHK-Cu does need care, and the reason is not the one most people expect.
Heat is not its main enemy. The peptide survives two weeks in water at 60 °C. What actually breaks it down is chemistry. It degrades when it meets:
- alkaline conditions, meaning the opposite of acidic
- oxygen and other oxidising conditions
So keeping air and alkaline solutions away from it matters more than keeping it cold.
It is also strongly water-loving, which means it does not cross fatty barriers such as cell membranes on its own. That is a practical thing to know when planning any laboratory work with it. The storage and handling guide covers the general rules for freeze-dried peptides.
What Do You Get When You Order It?
Australian Research Peptides supplies GHK-Cu as a freeze-dried powder in a sealed vial. Every batch is HPLC tested, and the certificate is published in the CoA library.
It is also one of the ingredients in GLOW, a fixed-recipe blend. Peptide types, categories and blends explains how a blend differs from a single compound, and why a vial with several ingredients is harder to test than a vial with one.
Common Questions
Yes. They are two names for one molecule. Copper Tripeptide-1 is the name used on cosmetic ingredient lists, and GHK-Cu is the name used in research papers.
No. The copper is already attached, which is what the Cu in the name means. A vial of GHK-Cu holds the peptide and the copper together as a single unit.
Because the copper is the part being delivered. Studying GHK on its own leaves out the thing it is thought to carry, which is most of what makes it interesting.
Yes, but only on skin. The controlled human studies have used products applied to the skin over weeks or months. There is no comparable body of controlled research on any other route.
Australian Research Peptides catalogues the copper tripeptide two ways, as a 100 mg GHK-Cu vial and inside the GLOW blend, both in stock with certificates published, and ships either from Sydney under Skin & Cellular Research.
References
- Pickart L, Thaler MM. Tripeptide in human serum which prolongs survival of normal liver cells and stimulates growth in neoplastic liver. Nat New Biol 1973;243(124):85-7 (PMID 4349963)
- Pickart L, Thaler MM. Growth-modulating tripeptide (glycylhistidyllysine): association with copper and iron in plasma, and stimulation of adhesiveness and growth of hepatoma cells in culture by tripeptide-metal ion complexes. J Cell Physiol 1980;102(2):129-39 (PMID 6246126)
- Pickart L, Freedman JH, Loker WJ, et al. Growth-modulating plasma tripeptide may function by facilitating copper uptake into cells. Nature 1980;288(5792):715-7 (PMID 7453802)
- Pickart L. The human tri-peptide GHK and tissue remodeling. J Biomater Sci Polym Ed 2008;19(8):969-88 (PMID 18644225)
- Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. Int J Mol Sci 2018;19(7) (PMID 29986520)
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