The short version of copper chelate fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-10-14. Anything still debated is marked as such rather than presented as settled.
GHK-Cu is the copper complex of the tripeptide glycyl-L-histidyl-L-lysine, a short sequence found naturally in human plasma, saliva and urine. Loren Pickart reported the isolation of the free peptide in 1973 while studying factors that influenced the growth of aged liver cells in culture. The peptide was later shown to bind copper(II) with high affinity, and the metal-bound form became the focus of most subsequent research. Its concentration in circulation declines markedly with age, a pattern that is well documented, though the physiological consequences of that decline remain debated.
The peptide portion consists of three amino acids: glycine, histidine and lysine. Copper(II) coordinates through the imidazole nitrogen of histidine, the alpha-amino group of glycine and a deprotonated amide nitrogen of the backbone, producing a roughly square-planar geometry. This arrangement gives the complex its characteristic blue-to-violet colour and helps it resist dissociation in water. Reported stability constants are high, although values differ between studies because of differences in ionic strength and measurement method.
GHK-Cu is a coordination complex formed between the peptide glycyl-L-histidyl-L-lysine and a copper(II) ion. The unbound chain, abbreviated GHK, consists of three amino acids and occurs naturally in human plasma, saliva, and urine. Binding of the metal is mediated mainly by the imidazole nitrogen of the histidine residue together with backbone amides, producing a stable chelate. Ingredient nomenclature often lists the same substance as copper tripeptide-1. Its charge and solubility behaviour differ from those of the metal-free chain.
The copper-binding activity of this sequence was described in the 1970s during studies of liver tissue and plasma factors. Early work identified the peptide as a component that influenced copper uptake by cells and that appeared in wound fluid. Later investigations examined its presence across species, reporting the same chain in human and animal samples. A decline in measured concentration with age became a recurring observation, although the underlying causes remain incompletely characterised.
| Property | Value | Notes |
|---|---|---|
| INCI name | Copper tripeptide-1 | Standard designation on cosmetic ingredient labels |
| Peptide sequence | Gly-His-Lys | Three-residue ligand; binding occurs at the histidine side chain |
| Metal-to-peptide ratio | 1 to 1 | One copper(II) ion per peptide unit |
| Appearance | Blue to violet powder | Colour arises from copper-to-peptide electronic transitions |
| Water solubility | Freely soluble | Commonly formulated in aqueous or water-alcohol systems |
GHK-Cu is a coordination complex formed between the tripeptide glycyl-L-histidyl-L-lysine and a copper(II) ion. The peptide was isolated from human plasma in the early 1970s by Loren Pickart, who observed that a plasma fraction from young donors stimulated growth in cultured liver cells. The copper-bound form is abbreviated GHK-Cu, while the metal-free peptide is written simply as GHK. In the research literature the complex also appears as copper tripeptide-1 and as glycyl-histidyl-lysine copper complex.
Copper(II) binds the peptide through four nitrogen donors: the terminal amino group, the imidazole nitrogen of histidine, and two deprotonated amide nitrogens of the peptide backbone. This tetradentate arrangement gives a roughly square-planar geometry, the thermodynamically favoured form near neutral pH. Because the amide nitrogens must lose a proton before they can coordinate, complex formation is strongly pH-dependent, and the fully coordinated species dominates only above mildly acidic conditions. Electronic transitions within the copper d orbital set produce the characteristic blue to violet colour in aqueous solution.
GHK-Cu is a coordination complex formed from the tripeptide glycyl-L-histidyl-L-lysine and a copper(II) ion. The peptide binds copper through its histidine imidazole nitrogen, the terminal amino group, and the deprotonated amide nitrogen. This arrangement creates a square-planar or distorted geometry around the metal center, depending on pH and the presence of competing ligands. The complex occurs naturally in human plasma, saliva, and urine at low concentrations, and its sequence is conserved across many vertebrate species.
Discovery of GHK is generally attributed to work in the 1970s that isolated a plasma factor influencing liver cell behavior. Subsequent studies identified the copper-binding tripeptide and its ability to chelate copper with high affinity. Early reports linked the complex to wound healing and tissue remodeling in animal models. The free peptide and the copper-bound form have different properties, so the two are distinguished in the literature. Whether endogenous GHK-Cu serves a single primary physiological role remains an open question.
=== Portal hypertension === The portal vein also known as the hepatic portal vein carries blood drained from most of the gastrointestinal tract to the liver. Portal hypertension is mainly caused by cirrhosis of the liver. Other causes can include an obstructing clot in a hepatic vein (Budd Chiari syndrome) or compression from tumors or tuberculosis lesions. When the pressure increases in the portal vein, a collateral circulation develops, causing visible veins such as esophageal varices.
Isabelle Adjani, actress Bilal Hassani, singer-songwriter and Eurovision Song Contest 2019 French representative Kevin Germanier, Swiss fashion designer Camille Cottin, actress Noam Sinseau, comedian and dancer Fatou Guinea, actress and entrepreneur Jessé Rémond Lacroix, comedian, writer and actor Ebony, singer Marguerite, singer-songwriter and actress Galia Salimo, dancer and vedette Vinii Revlon, ballroom dancer and choreographer Loreen, singer Thomas Jolly, actor and artistic director
In 1922, German anti-Semitic theorist Alfred Rosenberg in his primary contribution to Nazi theory on Zionism, Der Staatsfeindliche Zionismus ("Zionism, the Enemy of the State"), accused German Zionists of working for a German defeat and supporting Britain and the implementation of the Balfour Declaration, in a version of the stab-in-the-back myth. Adolf Hitler took a similar approach in some of his speeches from 1920 onwards.
Sources: en.wikipedia.org
== Localization == As a GPI-anchored protein, Thy-1 is present in the outer leaflet of lipid rafts in the cell membrane. In case of neurons it is known to be expressed strongly in the mature axon. The axon hillock can act as a barrier for its lateral spread even though it has no transmembrane segment. Thy-1 has been suggested to interact with G inhibitory proteins, the Src family kinase (SFK) member c-fyn, and tubulin within lipid rafts. In rats and mice, Thy-1 protein is present on the soma (cell body) and dendrites of neurons but is not expressed on axons until axonal growth is complete, and is again temporarily suppressed during axonal injury. HIV-1 Matrix co-localizes with Thy-1 in lipid rafts, the site of virus particle budding from cells, and Thy-1 is incorporated into virus particles as a result of this process.
==== Australia ==== In Australia, LSD is classified as a Schedule 9 prohibited substance under the Poisons Standard (February 2017), indicating it may be abused or misused and its manufacture, possession, sale, or use should be prohibited except for approved research purposes. In Western Australia, the Misuse of Drugs Act 1981 provides guidelines for possession and trafficking of substances like LSD.
== Types == The multiple subtypes of cardiac amyloidosis have varying epidemiological, diagnostic, and prognostic characteristics. Seventy five percent of transthyretin (TTR) cardiac amyloidosis is the wild-type and 25% if the inherited type.
Sources: en.wikipedia.org
Stone Cold is a 1991 action film directed by Craig R. Baxley and starring Brian Bosworth, Lance Henriksen and William Forsythe. The film's story centers on a biker gang in Mississippi that tries to assassinate district attorney Brent Whipperton and free Trouble Owens, one of their members who is about to be resentenced to death for the murder of a priest. Hyped as the first major biker film in decades, and boasting the feature debut of controversial American football star Brian Bosworth, it has a particularly convoluted production history and went through many creative and logistical challenges. It was released on May 17, 1991, to mostly negative reviews, and underperformed at the box office. It has since enjoyed a modest reappraisal, with favorable comparisons being made to the more sanitized approach of modern action pictures.
== Further reading == Kremyanskaya M, Ginzburg YZ, Hoffman R (March 2026). "Modulators of the hepcidin pathway in polycythemia vera and myelofibrosis". Blood. 147 (12): 1278–1288. doi:10.1182/blood.2025028643. PMID 41100735.
=== Gag order === Syngenta sued to stop communication by Swiss health authorities with the Swiss public regarding the "relevance" of specific metabolites of chlorothalonil that Swiss authorities detected in high concentrations in the groundwater from which hundreds of thousands of Swiss people obtain drinking water. The court banned Swiss health authorities from communicating with the public about the dangers posed by some of the metabolites.
Sources: en.wikipedia.org
It is a complex of a three-amino-acid peptide, glycine, histidine and lysine, bound to a single copper(II) ion. The metal is held mainly by the histidine side chain and the peptide backbone. Most commercial material is supplied as an acetate salt rather than as the free complex.
The free peptide was reported in 1973 by Loren Pickart, who isolated it from human plasma. Its copper-binding behaviour was characterised over the following years. The metal-bound form has been the subject of most later research.
Yes. Copper tripeptide-1 is the name used in cosmetic ingredient labelling, while GHK-Cu is the shorthand found in the scientific literature. Both refer to the same peptide-copper complex, and the two terms are interchangeable in most technical documents.
GHK denotes the unbound chain of three amino acids. GHK-Cu describes the form in which a copper(II) ion is held by that chain. The two are not interchangeable in solution, since charge, molecular weight, and reactivity differ.