The short version of copper(II) complex fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-03-23 and is reviewed periodically as new material appears.
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.
GHK-Cu is a coordination complex formed between the tripeptide glycyl-L-histidyl-L-lysine and a copper(II) ion. The peptide binds copper through its histidine imidazole nitrogen, its terminal amino group, and a deprotonated amide nitrogen, creating a stable chelate ring. The resulting complex carries a distinctive blue to blue-violet color, which arises from copper d-d electronic transitions. In the solid state it is usually handled as a powder, while in solution the complex can dissociate and re-form depending on pH and competing ligands. The name copper tripeptide-1 is widely used in ingredient listings.
The tripeptide was first isolated from a human plasma filtrate in 1973 during studies of tissue repair factors. Later work detected the free peptide and its copper complex in saliva, urine, and wound fluid, suggesting a natural role in tissue remodeling. Plasma concentrations reported in early literature decline with age, a pattern often cited in discussions of skin aging. Whether these endogenous levels are directly functional or largely incidental remains an open question. The peptide sequence is conserved across mammalian species.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Copper(II) peptide complex | Coordination compound rather than a simple salt |
| Peptide sequence | Glycyl-L-histidyl-L-lysine | Abbreviated GHK in most literature |
| Molecular formula | C14H22N6O4Cu | Reported for the 1:1 complex |
| Principal binding site | Histidine imidazole nitrogen | Backbone amides contribute additional coordination |
| Common synonym | Copper tripeptide-1 | Used in ingredient and product labelling |
GHK-Cu is a coordination complex formed between the tripeptide glycyl-L-histidyl-L-lysine and copper(II). The peptide sequence consists of glycine, histidine, and lysine, and its imidazole and amino groups provide binding sites for the metal ion. In the complex, copper is held through nitrogen donors from the histidine side chain, the N-terminal amine, and deprotonated amide nitrogens. The resulting compound is intensely blue and water-soluble. It occurs naturally in human plasma, saliva, and urine at low concentrations.
The peptide was first isolated from human albumin in 1973 by Loren Pickart, who later described its copper-binding behavior. Early work linked the complex to wound healing and tissue remodeling. Plasma levels of GHK decline with age, a pattern that stimulated interest in topical and supplemental applications. Researchers have reported that the tripeptide influences collagen synthesis, antioxidant defense, and inflammatory signaling in cell and animal models. Human clinical evidence remains limited and often relies on small studies.
Stability of GHK-Cu in solution depends on pH, temperature, buffer composition, and oxygen exposure. The copper center can undergo reduction or dissociation, especially in the presence of strong metal chelators such as EDTA. Aqueous solutions are often prepared fresh or stored frozen to limit degradation. Lyophilized solid is more stable than liquid formulations, but it can absorb moisture and should be kept dry. Light exposure may also affect copper complexes, though the effect is often modest.
Purity assessment typically involves high-performance liquid chromatography for the peptide and atomic spectroscopy for copper content. The ratio of copper to peptide is a key quality parameter; a value near one indicates proper stoichiometry. Impurities can include free peptide, copper salts, and truncated sequences from synthesis. Because the complex is dynamic, sample preparation and mobile-phase conditions can shift the observed species. Reported purity values therefore depend on the analytical method and should be interpreted with that context.
The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a transcontinental country that spanned much of Eurasia from its formation in 1922 until its dissolution in 1991. It was the world's third-most populous country, the largest by area, and bordered twelve other countries. A diverse multinational state, it was organized as a federal union of national republics, with the largest and most populous being the Russian Soviet Federative Socialist Republic (SFSR). The world's flagship communist state, it was governed by the Communist Party under Marxism–Leninism, through soviet councils. The Soviet economy was also centrally planned. Its capital and largest city was Moscow. The Soviet Union's roots lay in the October Revolution of 1917. The new government, led by Vladimir Lenin, established the Russian SFSR, the world's first constitutionally communist state. Following the Bolshevik victory in the Russian Civil War, the Russian SFSR and its subordinate republics were merged into the Soviet Union in 1922. Following Lenin's death in 1924, a six-year power struggle saw Joseph Stalin emerge as the country's undisputed personalist ruler. He initiated rapid industrialization and forced collectivization that led to significant growth, but contributed to a devastating famine in the 1930s that killed millions. The Soviet forced labour camp system, known as the Gulag, was expanded. During the late 1930s, Stalin's government conducted the Great Purge to eliminate opposition, resulting in deportations, executions, and the Moscow trials.
== Society and culture == People with noma and noma survivors may face stigma. Some think that noma is a contagious disease, so they avoid noma sufferers and survivors to avoid contracting it. Parents may hide afflicted children within the home because of social stigma, which can prevent them from getting treatment. Some also believe noma may be caused by witchcraft or a curse on the child's parents. Based on one 1997 estimate, roughly 770,000 people worldwide live with noma sequelae. However, "noma is a disease of shame," and children are sometimes hidden in isolation rather than being sent to receive treatment. In Nigeria, sufferers and their families may seek traditional medicine rather than go to a medical center. In a study of 7,185 noma sufferers across Nigeria, only 19% reported going to a hospital or medical center upon discovering a facial lesion. 47.6% took 1–3 weeks to visit a hospital; the rest took longer to visit a hospital. Children and other noma survivors in Africa are helped by a few international charitable organizations, such as Facing Africa, a UK registered charity that helps affected Ethiopians, and Swiss charity Winds of Hope. The Hilfsaktion Noma E.v is a non-governmental organization that has been involved in the management of Noma survivors for 30 years. They have a presence in 9 countries within the sub-Saharan Noma belt and have two fully funded clinics for the comprehensive management of Noma patients (one in Niger Republic and the other in Guinea Bissau).
This results in generalized inflammation in the heart, producing acute erosions and vegetations with fibrin deposition in the mitral valve that may be followed by chronic changes over years to decades, including shortening of the chordae tendinae and thickening or fusion of the mitral leaflets, leading to a severely compromised "buttonhole" or "fish mouth" valve. In 70% of cases rheumatic heart disease involves only the mitral valve, while 25% of cases involve both the aortic and mitral valves. Involvement of other heart valves without damage to the mitral is exceedingly rare. Mitral stenosis is almost always caused by rheumatic heart disease. Less than 10% of aortic stenosis is caused by rheumatic heart disease. Rheumatic fever can also cause chronic mitral and aortic regurgitation. While developed countries once had a significant burden of rheumatic fever and rheumatic heart disease, medical advances and improved social conditions have dramatically reduced their incidence. Many developing countries, as well as indigenous populations within developed countries, still carry a significant burden of rheumatic fever and rheumatic heart disease and there has been a resurgence in efforts to eradicate the diseases in these populations. Among persons who have experienced rheumatic fever, long-term intramuscular antibiotic therapy is used as secondary prophylaxis against additional streptococcal infections, which can contribute to progression of rheumatic heart disease.
Sources: en.wikipedia.org
A Scatchard plot (Rosenthal plot) can be used to show radioligand affinity. In this type of plot, the ratio of Bound/Free radioligand is plotted against the Bound radioligand. The slope of the line is equal to the negative reciprocal of the affinity constant (K). The intercept of the line with the X axis is an estimate of Bmax. The Scatchard plot can be standardized against an appropriate reference so that there can be a direct comparison of receptor density in different studies and tissues. This sample plot indicates that the radioligand binds with a single affinity. If the ligand were to have bound to multiple sites that have differing radioligand affinities, then the Scatchard plot would have shown a concave line instead.
United States government sanctions are financial and trade restrictions imposed against individuals, entities, and jurisdictions whose actions contradict U.S. foreign policy or national security goals. Financial sanctions are primarily administered by the U.S. Department of the Treasury's Office of Foreign Assets Control (OFAC), while export controls are primarily administered by the U.S. Department of Commerce's Bureau of Industry and Security (BIS). Restrictions against sanctioned targets vary in severity. Comprehensive sanctions currently target Cuba, Iran, North Korea, Russia, and certain conflict regions of Ukraine, heavily restricting nearly all trade and financial transactions between U.S. persons and those regions. Targeted sanctions focus on specific individuals or entities engaged in activities contrary to U.S. foreign policy or national security goals. The U.S. also implements "secondary sanctions," which risk a sanctions designation against a non-U.S. person who transacts with sanctioned parties in violation of U.S. sanctions law, even where no U.S.-jurisdictional nexus existed. Critics of the United States sanctions program raise humanitarian concerns related to adverse impacts felt by populations whose governments or economies have been sanctioned, as well as cases where sanctions were not effective in deterring adversarial activities.
The University of Pittsburgh Medical Center (UPMC) is an American integrated global nonprofit health enterprise that has 100,000 employees, 40 hospitals with more than 8,000 licensed beds, 800 clinical locations including outpatient sites and doctors' offices, a 3.8 million-member health insurance division, as well as commercial and international ventures. It is closely affiliated with its academic partner, the University of Pittsburgh. It is considered a leading American health care provider, as its flagship facilities have ranked in U.S. News & World Report "Honor Roll" of the approximately 15 to 20 best hospitals in the U.S. for over 15 years. As of 2016, its flagship hospital UPMC Presbyterian was ranked 12th nationally among the best hospitals (and first in Pennsylvania) by U.S. News & World Report and ranked in 15 of 16 specialty areas when including UPMC Magee-Womens Hospital. This does not include UPMC Children's Hospital of Pittsburgh which ranked in the top 10 of pediatric centers in a separate US News ranking.
Sources: en.wikipedia.org
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.
The chain occurs in human plasma, saliva, and urine. Measured amounts are reported to fall with age. Copper binding by the sequence is treated as part of normal metal handling in tissue.
The bound copper(II) centre contributes to redox behaviour and to stability under physiological conditions. Free copper ions can participate in reactions that generate reactive species, while chelated metal is generally more controlled. The chain may also serve as a carrier for copper in experimental systems.
It is a complex of the tripeptide glycyl-L-histidyl-L-lysine with a copper(II) ion. The peptide coordinates the metal through its histidine, amino terminus, and an amide nitrogen. It is often listed simply as copper tripeptide-1.