A practical reference on copper tripeptide: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-04-22 and is reviewed periodically as new material appears.
The sequence now called GHK was first reported in the early 1970s after isolation from human plasma, where it was noted to influence liver cell behavior in laboratory preparations. Later work described a copper-binding form and its activity in fibroblast and wound-model experiments. Review articles frequently group the substance with other copper peptides. Concentrations in blood appear to fall with age in several small surveys, although the reason for this trend is not settled. Whether such a decline carries functional consequences remains an open question.
Published work on GHK-Cu concentrates largely on cell culture systems rather than whole organisms. Frequently used endpoints include collagen synthesis, expression of matrix metalloproteinases, and migration of fibroblasts. Some reports describe antioxidant behavior, while others stress delivery of copper into cells. These mechanisms are proposed rather than demonstrated, and the relative weight of each pathway is unclear. Human trials are few and generally small, so laboratory findings should not be read as confirmed clinical results.
GHK-Cu is a coordination complex formed between the tripeptide glycyl-L-histidyl-L-lysine and a copper(II) ion. The peptide backbone consists of glycine, histidine, and lysine joined in that order. Copper is held through the imidazole nitrogen of histidine and the alpha-amino group at the N-terminus, which together produce a square-planar arrangement around the metal center. The solid appears blue to violet, a color that originates from d-d electronic transitions within the copper coordination sphere. The complex is indexed under CAS number 89030-95-5.
The compound entered scientific literature in the 1970s, when plasma factors with copper-binding activity were isolated and characterized. Later work expanded into wound healing, skin biology, and cosmetic formulation, where copper tripeptide-1 became a recognized ingredient name. Most published studies remain preclinical or small-scale, and findings are often reported in specialized dermatology or peptide journals. Regulatory treatment varies: some jurisdictions allow it as a cosmetic ingredient, while research-grade material is sold for laboratory use. Questions about optimal delivery, target tissues, and long-term effects continue to be investigated rather than settled.
GHK-Cu is a coordination complex formed between the tripeptide glycyl-L-histidyl-L-lysine and a copper(II) ion. The peptide sequence is often abbreviated Gly-His-Lys, and the copper is bound through the histidine imidazole nitrogen and adjacent peptide nitrogens. The complex is frequently described as a 1:1 peptide-to-copper species. It occurs naturally in human plasma, saliva, and urine at low concentrations. Its endogenous levels have been reported to decline with age, although the precise physiological role of that change remains an open question.
Research interest in GHK-Cu centers on its ability to deliver copper and to influence cellular processes in laboratory models. In cell culture and animal studies, the complex has been linked to collagen synthesis, antioxidant enzyme activity, and expression of genes associated with tissue remodeling. These effects are not equivalent to proven clinical outcomes. The mechanisms proposed include copper transfer to cuproenzymes, modulation of growth factor signaling, and interactions with extracellular matrix components. How much of the observed activity depends on intact GHK-Cu versus free copper or free peptide is not fully resolved.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Copper(II) peptide complex | Peptide chain coordinated to a single metal ion |
| CAS number | 89030-95-5 | Indexed for the peptide-copper complex |
| Molecular formula | C14H22CuN6O4 | Approximate formula for a one-to-one complex |
| Appearance | Blue to violet solid | Color from copper d-d transitions |
| Solubility class | Freely soluble in water | Also dispersible in some polar solvents |
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.
The International Nomenclature of Cosmetic Ingredients lists the substance as copper tripeptide-1, the name that appears on most topical product labels. Related designations include copper peptide and GHK-Cu, and the hyphenated form is common in research literature. In cosmetics the material is regulated as an ingredient rather than as a drug, so products may reach the market without evidence of the effects claimed for them. Whether those effects are clinically meaningful is an open question, since most supportive data come from laboratory work and small trials.
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.
Solid GHK-Cu is usually supplied as a lyophilized powder and is kept cold and dry. Moisture, light, and repeated temperature cycling shorten its useful life in the laboratory. In aqueous solution the complex undergoes slow hydrolysis of the peptide backbone and gradual loss of coordinated copper. Buffers containing strong chelators, such as EDTA, compete for the metal and strip it from the peptide. Working solutions are therefore prepared shortly before use, and leftover liquid is not returned to the stock container.
Identity and purity are established with a combination of chromatographic and spectroscopic techniques. Reversed-phase high-performance liquid chromatography separates the intact complex from peptide fragments and free copper, and the elution profile yields a purity estimate. Mass spectrometry gives the mass of the intact species and exposes degradation products. Ultraviolet-visible spectroscopy displays a broad absorption band in the visible region that is characteristic of the copper center. Nuclear magnetic resonance is less informative here, because the paramagnetic metal broadens signals and complicates spectral interpretation.
Copper content is measured separately, since a peptide assay alone does not report the metal-to-peptide ratio. Elemental techniques such as inductively coupled plasma optical emission spectroscopy quantify copper after acid digestion of the sample. The result is compared with the theoretical value for a one-to-one complex, and a shortfall indicates free peptide or partial dissociation. Suppliers differ in how they state purity, as some quote peptide content and others quote the whole complex. A defined stoichiometry therefore requires both a peptide assay and a copper assay.
homologous recombination A type of genetic recombination in which nucleotide sequences are exchanged between two similar or identical ("homologous") molecules of DNA, especially that which occurs between homologous chromosomes. The term may refer to the recombination that occurs as a part of any of a number of distinct cellular processes, most commonly DNA repair or chromosomal crossover during meiosis in eukaryotes and horizontal gene transfer in prokaryotes. Contrast nonhomologous recombination.
The Orphan Drug Act of 1983 is a law passed in the United States to facilitate development of orphan drugs—drugs for rare diseases such as Huntington's disease, myoclonus, ALS, Tourette syndrome or muscular dystrophy which affect small numbers of individuals residing in the United States. Orphan drug designation does not indicate that the therapeutic is either safe and effective or legal to manufacture and market in the United States. That process is handled through other offices in the US Food and Drug Administration. Instead, the designation means only that the sponsor qualifies for certain benefits from the federal government, such as market exclusivity and reduced taxes. In 1982 an informal coalition of supporters and families of patients with rare diseases who formed National Organization for Rare Disorders (NORD) and others, called for change to legislation to support development of orphan drugs, or drugs for treating rare diseases. They succeeded in getting the United States Congress to pass the Orphan Drug Act (ODA) in early 1983. Only thirty-eight orphan drugs had been approved prior to the 1983 Act; by 2014 "468 indication designations covering 373 drugs have been approved." Partly as a result of the 1983 US Orphan Drug Act, Japan adopted it in 1993 as did the European Union in 2000.
== Role of microchimerism in wound healing == Microchimeric fetal cells expressed collagen I, III and TGF-β3, and they were identified in healed maternal cesarean section scars. This suggests that these cells migrate to the site of damage due to maternal skin injury signals, and help repair tissue.
After the Christmas break, the Rhinos showed some strong performances, bolstered by Vusi Sibanda and Malcolm Waller, both of whom did not travel to the 2015 World Cup, but the One Day performances were abysmal. At the end of the season, the Rhinos won just 2 Pro50 matches but finished 2nd to Tuskers in the Logan Cup by only 3 points.
Cricket flour (or cricket powder) is a protein-rich powder made from crickets, using various processes. Cricket flour differs from true flours made from grains by being composed mainly of protein rather than starches and dietary fiber.
Sources: en.wikipedia.org
=== New York Mets (1962), later career, retirement === With New York, Mizell was used mainly out of the bullpen. His second appearance with the team (on May 15) was a start, though, in which he allowed four runs (three earned) in six innings against the Cubs. Though he got a no decision, the Mets won 6–5. Against the expansion Houston Colt .45's on June 14, he pitched "rather well" according to sportswriter Louis Effrat, throwing six scoreless innings after starter Jay Hook was unable to record an out in a 10–2 defeat. He failed to win a game with the Mets, however, posting a 7.34 ERA in 17 games (two starts) before getting released on August 4. In his last appearance with New York, on July 25, he had allowed six runs in 2+1⁄3 innings in an 11–5 loss to Milwaukee. After getting cut by the Mets, Mizell was reacquired by the Pirates. This time, however, he would pitch for the Columbus Jets of the Class AAA International League, and he would have to serve as an instructor until space for him became available on the team's roster. He ultimately made four appearances (three starts) for Columbus, posting a 2–1 record and a 3.27 ERA. Pittsburgh did not recall him after the season. Mizell participated in the Arizona Instructional League following the 1962 season, but when no teams signed him in 1963, he retired.
==== Mental health ==== Layard and others show that the most important influence on happiness is mental health. L.M. Keyes and Shane Lopez illustrate the four typologies of mental health functioning: flourishing, struggling, floundering and languishing. However, complete mental health is a combination of high emotional well-being, high psychological well-being, and high social well-being, along with low mental illness. Although health is part of well-being, some people are able to maintain satisfactory wellbeing despite the presence of psychological symptoms.
== External links == GeneReviews/NIH/NCBI/UW entry on Tyrosine Hydroxylase Deficiency including Tyrosine Hydroxylase-Deficient Dopa-Responsive Dystonia or Segawa Syndrome and Autosomal Recessive Infantile Parkinsonism Tyrosine+hydroxylase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
== Development == The basis of GoldSrc is the engine used in the video game Quake, albeit with heavy modification by Valve. While the engine served as the basis for GoldSrc, Gabe Newell said that a majority of the code used in the engine was created by Valve. GoldSrc's artificial intelligence systems, for example, were essentially made from scratch. The engine also uses some code from other games in the Quake series, including QuakeWorld and Quake II. In 1997, Valve hired Ben Morris and acquired Worldcraft, a tool for creating custom Quake maps. The tool was renamed Valve Hammer Editor and became the official mapping tool for GoldSrc. The engine supports skeletal animation, which allowed for more realistic body kinematics and facial expression animations than most other engines at the time of release. The GoldSrc engine initially had no real name and was simply called the Half-Life engine. When the need arose for Valve to work on the engine without risking introducing bugs into Half-Life's codebase, Valve forked the code, creating two main engine branches: one gold master branch, "GoldSrc", and the other "Src". Internally, any games using the original branch were referred to as "Goldsource" to differentiate it from the second branch, while the "Src" branch evolved into the Source engine. Valve released versions of the GoldSrc engine for OS X and Linux in 2013, eventually porting all of their first-party games using the engine to the platforms by the end of the year.
Sources: en.wikipedia.org
The disappointment was mitigated when the composition of the Government was known, in which the most prominent figures of Franco's "reformism" appeared, such as Manuel Fraga Iribarne, José María de Areilza and Antonio Garrigues y Díaz Cañabate. Other Francoist "reformists" from the Catholic (Alfonso Osorio) and Falangist "families" (the "blue reformists", Adolfo Suárez and Rodolfo Martin Villa) also participated in this government. Actually, the members of the government were imposed on Arias Navarro by the king, and in the case of Suárez it had been a suggestion of Fernández Miranda. This new government was often referred to in the press as the "Arias-Fraga-Areilza-Garrigues government".
McLaren Health Care Corporation, is headquartered in Grand Blanc, Michigan, includes 12 hospitals in Michigan, ambulatory surgery centers, imaging centers, a 490-member employed primary and specialty care physician network, commercial and Medicaid HMOs covering more than 732,838 lives in Michigan and Indiana, home health, infusion and hospice providers, pharmacy services, a clinical laboratory network and a wholly owned medical malpractice insurance company. McLaren operates Michigan’s largest network of cancer centers and providers, anchored by the Karmanos Cancer Institute, one of only 57 National Cancer Institute-designated comprehensive cancer centers in the U.S. McLaren has 28,000 full-time, part-time and contracted employees and more than 113,000 network providers throughout Michigan and Indiana. They used to operate in Ohio, but ended up shutting down St. Luke’s Hospital, and selling both the hospital, along with WellCare Physicians Group, to Bon Secours Mercy Health. As part of its Graduate Medical Education (GME) program, McLaren maintains academic affiliations with medical schools at Wayne State University, Michigan State University and Central Michigan University. McLaren’s six GME campuses offer 27 residencies and eight fellowship programs that train over 650 future physicians annually. All GME programs at McLaren are overseen and managed centrally by the Department of Academic Affairs. McLaren is the presenting sponsor of the Ally Challenge, an annual golf tournament held every year at Warwick Hills Country Club.
== Detection techniques == Early methods to detect alpha-amanitin included thin-layer chromatography (TLC). In most solvent systems used in TLC, alpha-amanitin and beta-amanitin would travel at different rates, thus allowing individual identification of each toxin. Another early method was the Meixner test (also known as the Wieland test), which would detect amatoxins, but also yielded false positives for some compounds, such as psilocin. Capillary zone electrophoresis was also developed, but was not adequately sensitive for clinical samples, but sufficient for mushroom extracts. More recently, the use of high-performance liquid chromatography (HPLC) has become the preferred method, which allows for better resolution, reproducibility, and higher sensitivity. A range of detectors can be paired with HPLC, such as UV or mass spectrometry. As early as the 1980s, antibody-based assays (immunoassays) were developed for amanitin (but more often recognize amatoxins as the antibodies cross-react with some of the congeners). The earliest immunoassays were radioimmunoassays and then enzyme linked immunosorbent assays (ELISAs). More, recently, in 2020, a monoclonal antibody-based lateral flow immunoassay (similar to a pregnancy test) has been developed that can quickly and selectively detect amatoxins in mushrooms and in urine samples.
Sources: en.wikipedia.org
It is the copper complex of the tripeptide glycyl-L-histidyl-lysine. The metal ion is held by the histidine imidazole group and the peptide N-terminus. Most research on it concerns skin and wound models.
The tripeptide was first isolated from human plasma and has also been reported in saliva and urine. Plasma levels appear to decline with age in some small studies. Those observations rest on limited sample sizes.
It is not authorized as a systemic medicine in most countries. Cosmetic preparations list it as an ingredient rather than an active pharmaceutical substance. Legal status therefore differs by jurisdiction.
GHK-Cu is a complex of the tripeptide glycyl-L-histidyl-L-lysine with copper(II). The peptide binds copper through its histidine residue and neighboring amide nitrogens, forming a stable coordination compound. It is studied as a research chemical and used in some cosmetic formulations.