The short version of Gly-His-Lys fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-12-26. Anything still debated is marked as such rather than presented as settled.
Copper binds to the peptide through the histidine imidazole nitrogen and the terminal amino group, forming a stable square-planar complex. Binding constants reported for copper(II) with GHK are high, so the peptide competes effectively for copper in solution. The complex absorbs visible light, which gives solutions a blue to violet colour. Whether the metal-free peptide has a distinct biological function of its own is still an open question; some work treats it mainly as a copper delivery vehicle, while other work reports peptide-specific effects.
The compound was first isolated from human plasma in the 1970s by Loren Pickart, who later described copper-binding activity in liver and other tissues. Early reports focused on its presence in blood and its ability to carry copper between proteins. Commercial and cosmetic use of the term 'copper peptide' has since broadened, and labels rarely distinguish GHK-Cu from other copper-binding fragments. This naming overlap makes literature searching harder, because cosmetic ingredient lists, supplier catalogues and laboratory papers use different vocabularies for the same molecule.
GHK-Cu is the copper-binding complex formed by the tripeptide glycyl-L-histidyl-L-lysine and a copper(II) ion. The free peptide is usually written as GHK, and the complex is written as GHK-Cu or Cu-GHK. The sequence was identified in human plasma and later detected in saliva and urine. Its name comes from the single-letter codes of glycine, histidine and lysine. The complex is widely described as a naturally occurring carrier of copper in blood rather than as a free peptide with its own hormonal role.
Aqueous solutions of GHK-Cu are less stable than the dry powder. The peptide backbone is vulnerable to hydrolysis at extreme pH, and copper can be stripped from the complex by strong chelating agents such as EDTA or citrate. Oxidising agents and high concentrations of ascorbic acid can reduce copper(II) and change the complex, which is one reason formulators often keep such ingredients in separate phases. How quickly these changes occur under real storage conditions depends on pH, buffer, temperature and packaging, and quantitative data on the subject are limited.
Dry material is normally held cold, commonly at -20 °C for long-term storage and 2 to 8 °C for working quantities, protected from light and moisture. Vials should be allowed to reach room temperature before opening so that condensation does not form on the powder. In liquid formulations the complex is generally kept near neutral to slightly acidic pH, because strongly alkaline conditions favour precipitation of copper hydroxide. Antioxidants or chelate-stabilising excipients are often added, though the specific approaches are proprietary and rarely published in detail.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography with ultraviolet detection, often paired with mass spectrometry to confirm the expected mass. Copper content is measured separately by inductively coupled plasma optical emission spectrometry or atomic absorption spectroscopy, because the peptide assay alone does not establish the metal-to-peptide ratio. Visible spectroscopy provides a rapid check on complex integrity through the absorption band in the visible region. Agreement between the peptide assay and the copper assay is the practical test of whether a sample is the intended complex rather than a mixture.
| Property | Value | Notes |
|---|---|---|
| Sequence | Gly-His-Lys | Three amino acids; histidine supplies the main copper-binding nitrogen |
| Bound metal | Copper(II) | Coordination is described as square-planar around the metal centre |
| Appearance | Blue to violet solid | Colour originates from copper d-d electronic transitions |
| Solubility class | Freely soluble in water | Aqueous solutions are often slightly acidic |
| Common synonyms | Copper tripeptide, Cu-GHK | Ingredient lists may say only 'copper peptide' without giving the sequence |
Dry material is typically held at low temperature, often around minus twenty degrees Celsius, and protected from moisture and light. Copper complexes can release their metal ion under acidic conditions or in the presence of competing chelators. Hydrolysis of the peptide backbone is a slower but real pathway, and the histidine residue is susceptible to oxidation over long periods. Stability statements therefore depend on formulation, pH, and container, and they should be read as conditional rather than absolute.
Identity and purity are usually assessed with reversed-phase high-performance liquid chromatography, often paired with mass spectrometry. Copper content is measured separately by techniques such as inductively coupled plasma mass spectrometry or atomic absorption. Amino acid analysis confirms the peptide sequence after hydrolysis. Because the metal and the peptide can be quantified independently, a complete certificate of analysis normally reports both values rather than a single purity figure. This separation of measurements is important when comparing suppliers.
Solid GHK-Cu appears as a blue to blue-violet powder, and the colour is a direct consequence of copper coordination. The complex dissolves readily in water and in many polar solvents, while the free peptide behaves differently. Solubility in nonpolar media is low, which limits its use in oil-based systems. Solutions are typically prepared fresh because the dissolved form is more exposed to hydrolysis and to loss of the metal ion than the dry powder. Working concentrations are usually low, and preparation notes often specify the solvent and the order of addition.
Laboratory studies describe GHK-Cu as a source of copper that cells can take up, with reported effects on collagen, elastin, and glycosaminoglycan synthesis in cultured fibroblasts. The peptide also appears in wound-repair research, where it is linked to the activity of matrix metalloproteinases and their inhibitors. These observations come largely from cell and animal models. How directly the complex controls any single pathway in intact human skin remains an open question, and reported effects depend on concentration, vehicle, and exposure time.
Copper takes part in redox chemistry, and the same property that makes it useful in enzymes can generate reactive oxygen species when the ion is loosely bound. GHK chelates copper through imidazole, amino, and amide nitrogen donors, which reduces the amount of free copper in solution. Whether that chelation is protective, neutral, or harmful in a given tissue is not settled. Laboratory assays report both antioxidant and pro-oxidant behavior, depending on the conditions and the readout used.
Published work on GHK-Cu is dominated by in vitro experiments and small animal studies. Human trials tend to be short and small, with endpoints such as skin appearance rather than clinical outcomes. Review articles often summarize the same underlying laboratory findings, which can make the evidence base look broader than it is. Several basic questions remain open: the concentration of the intact complex in human tissue, the route by which it crosses the skin barrier, and whether effects seen in culture produce measurable changes in people.
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 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.
Erhöhter Blutdruck sollte gesenkt werden. Bestimmte blutdrucksenkende Medikamente sind bei Herzinsuffizienz unabhängig vom Vorliegen eines Bluthochdrucks indiziert und sollten deshalb bevorzugt eingesetzt werden. Patienten mit einer koronaren Herzkrankheit profitieren oft von einer Ballondilatation der verengten Gefäße mit Stentversorgung oder von einer Bypassoperation. Bei einem relevanten Herzklappenfehler sollte eine Klappenrekonstruktion oder ein Klappenersatz erwogen werden. Ein obstruktives Schlafapnoe-Syndrom (OSA) sollte behandelt werden. Herzrhythmusstörungen (in den meisten Fällen Vorhofflimmern) sollten bei geeigneten Patienten medikamentös oder per Katheterablation behoben werden. Wenn das Herz aufgrund von Erregungsleitungsstörungen nicht gut koordiniert schlägt, kann ein Herzschrittmacher helfen.
=== Nicht-medikamentöse Therapie === Eine Reduktion kardiovaskulärer Risikofaktoren ist anzustreben. Zur nicht-medikamentösen Therapie gehören Gewichtsnormalisierung, reduzierte Kochsalzzufuhr, Limitierung der Flüssigkeitszufuhr (< 2 Liter/Tag) und Alkohol- und Nikotinreduktion bzw. -karenz. In den NYHA-Stadien I-III wird moderates körperliches Training empfohlen, bei dekompensierter Herzinsuffizienz körperliche Schonung bis zur Bettruhe. Reisen in Höhenlagen sowie heißes und feuchtes Klima sollten vermieden werden. Zur dauerhaften Lebensstilveränderung kann der Besuch einer Herzschule sinnvoll sein. Bei durch Herzinsuffizienz verursachte Ateminsuffizienz kann eine Beatmung notwendig werden. Hierbei sollte, wenn möglich, zur Vermeidung einer endotrachealen Intubation zunächst die Anwendung einer nichtinvasen Beatmungsform erfolgen.
=== Medikamentöse Therapie === Die aktuellen Leitlinien erfordern eine Unterscheidung, ob die im Echokardiogramm ermittelbare Ejektionsfraktion erhalten oder vermindert ist. Die Standardtherapie bei einer Herzinsuffizienz mit verminderter Auswurffraktion (Ejektionsfraktion HFrEF) besteht aus einer Kombination aus vier Medikamenten, den "Fantastic Four", bei denen alle eine signifikante Reduktion der Mortalität und der Hospitierungsrate festgestellt wurde: ACE-Hemmern (bzw AT1-Antagonisten), Betablockern, Mineralocorticoid-Rezeptor-Antagonisten (MRA) und Natrium/Glucose Cotransporter-2-Inhibitoren (SGLT2). Bei einer Herzinsuffizienz mit erhaltener Auswurffraktion (HF-pEF) gab es lange Zeit keine Medikamente, die die Prognose verbessern konnten. Die SGLT-2 Inhibitoren Dapagloflizin und Empagliflozin sind die ersten Medikamente, bei denen eine signifikante Symptomverbesserung und Reduktion der Hospitalisierungsraten bei Patienten mit einer HF-pEF gezeigt wurde. Zusätzlich müssen hier die Risikofaktoren und Komorbiditäten wie Bluthochdruck sorgfältig behandelt werden. Bei einer Überwässerung können Diuretika, wie Furosemid oder Thiazide, die Symptome bessern. Die Therapie der chronischen Herzinsuffizienz war im letzten Jahrhundert dominiert von Herzglykosiden (wie das ab 1906 intravenös eingesetzte Strophanthin und Digoxin) die als Herzkraft-stärkend (inotrop) galten. Diese haben in kontrollierten Studien allerdings keine Senkung der Mortalität bewiesen. Wegen ihrer Toxizität und schlechten Steuerbarkeit haben sie heute nur noch eine Nischenfunktion z. B.
Sources: de.wikipedia.org
Gesicherte prognostische Indikation heißt, dass die dauerhafte Gabe des Medikaments in mehreren Untersuchungen einen eindeutig lebensverlängernden Effekt bewiesen hat. Dazu gehören bei der chronischen Herzinsuffizienz mit reduzierter Ejektionsfraktion ACE-Hemmer in allen Stadien, AT1-Antagonisten: Blocker des Angiotensin-II-Rezeptors (Subtyp 1); bei Unverträglichkeit von ACE-Hemmern, die Betablocker Bisoprolol, Carvedilol, Metoprolol und Nebivolol generell ab NYHA II, Aldosteronantagonisten ab NYHA-Stadium II, Neprilysin-Inhibitoren (z. B. Sacubitril in Kombination mit Valsartan) in allen Stadien. Symptomatische Indikation bedeutet, dass diese Medikamente nur eingesetzt werden müssen, wenn bestimmte Symptome vorliegen und diese durch das Medikament gebessert werden. Dazu zählen Diuretika bei Anzeichen für eine Überwässerung des Körpers, Digitalisglykoside bei Patienten mit Vorhofflimmern, einer deutlichen Leistungsschwäche oder häufigen Krankenhauseinweisungen wegen der Herzinsuffizienz und Antiarrhythmika bei symptomatischen Herzrhythmusstörungen. Ohne pathophysiologische oder pharmakologische Erklärungen zum Wirkmechanismus gibt es seit 2021 neue Therapieansätze für die Herz- und Niereninsuffizienz. Untersucht und teilweise auch zugelassen wurden SGLT-2-Hemmer (Gliflozine).
Sources: de.wikipedia.org
The letters GHK are the one-letter codes for glycine, histidine and lysine, the three amino acids in the peptide. The suffix Cu indicates that the peptide is bound to a copper ion, normally copper(II).
The free tripeptide and its copper complex have been measured in human plasma, saliva, urine and some tissue extracts. Reported concentrations vary widely between studies, and the role of the complex in normal physiology remains partly unresolved.
The plain peptide lacks the metal, so its charge, colour and binding behaviour differ. The copper complex is blue and carries a bound copper ion, while the metal-free form is colourless and has different solution chemistry.
Dry powder is best kept cold, dark and sealed, typically at -20 °C for long-term storage or 2 to 8 °C for material in regular use. Vials should be warmed to room temperature before opening to prevent moisture condensing on the contents. Aqueous stock solutions degrade faster and are usually prepared fresh.