Everything below concerns c-Met signaling. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-03-05. Where a claim depends on a specific study, the study is described rather than over-claimed.
Development of dihexa has been linked to academic research on synaptogenesis, the formation of new synapses. Preclinical studies in rodents have examined its effects on learning and memory tasks. These studies are often cited in discussions about cognitive enhancement, but they do not establish safety or efficacy in humans. The compound's patent and commercial history is limited, and it is not widely available through pharmaceutical channels. Most information comes from animal models and in vitro experiments. Researchers continue to explore its basic biology rather than clinical applications.
Dihexa is not approved for human use in the United States or the European Union. It is commonly sold as a research chemical, a category that may not require the same regulatory review as medicines. Buyers should note that product labels may lack independent verification of identity or purity. The legal status can vary by country, and importation may be restricted. Reliable information about sourcing and quality is often scarce. Scientific publications typically use synthesized material from laboratories rather than commercial consumer products.
Regulatory status varies by country, and dihexa is not widely approved as a medicine. In many jurisdictions it is treated as a research chemical, which limits its legal sale, possession, and human use. Products marketed online may lack verified purity or identity, and labels can be inaccurate. Researchers typically source material from suppliers that provide analytical documentation and follow institutional safety rules. Open questions remain about long-term stability, metabolite formation, and human pharmacokinetics.
Dihexa is typically supplied as a lyophilized powder for laboratory research. Lyophilization removes water and improves stability during transport and storage. The solid is commonly stored at -20 °C or lower, desiccated, and protected from light. Repeated freeze-thaw cycles and exposure to moisture can degrade peptides, so aliquoting and sealed containers are standard practice in most laboratory settings. These handling measures apply to research-grade material and do not imply clinical suitability.
Purity and identity are usually assessed with reverse-phase high-performance liquid chromatography (RP-HPLC) and mass spectrometry. RP-HPLC separates components by hydrophobicity and can estimate peptide purity. Mass spectrometry confirms molecular mass and helps detect truncations or modifications. Some laboratories also use amino acid analysis or nuclear magnetic resonance for structural verification. A certificate of analysis from a supplier may list these results, but independent verification is often recommended for critical work.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 1401708-83-5 | Identifier used in chemical databases. |
| Common synonyms | P21; N-hexanoic-Tyr-Ile-(6-aminohexanoic amide) | Names vary by supplier and publication. |
| Physical form | White to off-white powder | Lyophilized solid typical of peptides. |
| Solubility | Soluble in DMSO; limited in water | Aqueous preparation may need a co-solvent. |
| Storage | -20 °C, desiccated, protected from light | Reduce freeze-thaw cycles to maintain stability. |
Dihexa is commonly handled as a lyophilized powder in laboratory settings. Storage at -20 °C in a desiccated, light-protected container is typical for peptides. Repeated freeze-thaw cycles can degrade the material, so aliquoting is often recommended. Aqueous solutions may be less stable than organic stocks and should be prepared fresh when possible. Personnel should follow institutional safety procedures and avoid uncontrolled exposure. Because human effects are not well characterized, handling precautions are prudent.
The proposed mechanism of dihexa centers on activation of the hepatocyte growth factor receptor, also called c-Met. Some studies suggest it acts as a mimetic of hepatocyte growth factor, promoting signaling pathways involved in synapse formation. Other work has explored interactions with angiotensin IV pathways, but the exact binding targets remain uncertain. Laboratory findings come mainly from cell cultures and animal models. Whether these mechanisms operate similarly in humans is an open question. Researchers have not established a single, universally accepted mechanism of action.
Chemically, dihexa belongs to a broader group of angiotensin IV analogs. Researchers have modified the natural peptide to alter stability, binding, or distribution. Such changes can affect how the molecule behaves in experiments. The parent peptide angiotensin IV is involved in various physiological processes, but the modified analog is not identical to it. Public summaries sometimes blur the distinction between the natural fragment and the synthetic research compound. This distinction matters when interpreting study results.
Dihexa is a synthetic peptide that has been examined in laboratory and animal research. Its design is based on angiotensin IV, a naturally occurring peptide fragment produced in the body. The short name dihexa appears in scientific papers and online discussions, while the full chemical name describes a modified peptide chain. It is not a vitamin, mineral, or plant-derived compound. Suppliers typically present it as a research chemical rather than an approved medicine.
The full name often given is N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide. This name indicates a chain containing tyrosine, isoleucine, and a six-carbon amino acid derivative. Databases list a CAS Registry Number and a molecular formula for the compound. The peptide is small compared with proteins, and its structure allows it to be studied in cell cultures and animal models. Exact identity depends on the supplier's synthesis and purification process. Minor impurities can remain after synthesis.
== Medical use == Tapentadol is used for the treatment of moderate to severe pain for both acute (following e.g. injury or surgery) and chronic musculoskeletal pain. It is also specifically indicated for controlling the pain of diabetic neuropathy when around-the-clock opioid medication is required. Extended-release formulations of tapentadol are not indicated for use in the management of acute pain and are instead indicated only for the relief of severe, disabling pain, that is long-term in nature and cannot be controlled by any other pharmacological means. Tapentadol is pregnancy category C. There are no adequate and well-controlled studies of tapentadol in pregnant women, and tapentadol is not recommended for use in women during and immediately prior to labor and delivery. There are no adequate and well-controlled studies of tapentadol in children.
=== Pharmacokinetics === Upon oral administration, bismuth subcitrate undergoes partial dissolution in the acidic gastric environment, with the majority of the dose localizing in the stomach. Although the most of the dose remains unabsorbed, a small portion enters into systemic circulation, and serum concentration reaches (Cmax at 20–30 min) 16–80 ng/mL - levels that exceed the minimum inhibitory concentration for H. pylori (1–8 μg/mL). Co-administration with proton pump inhibitors (PPI) such as omeprazole or H2-antagonists such as famotidine increases serum and tissue concentrations of bismuth, possibly due to greater solubility and less rapid precipitation in less acidic gastric juice. In the small intestine, unlike the stomach, bismuth subcitrate does not form stable binding layers or antimicrobial reservoirs. At the more alkaline pH, colloidal particles aggregate and precipitate without significant further dissolution or interaction with epithelial or microbial targets. There is no conclusive evidence for microbiological impact of bismuth in the small intestine when administered at therapeutic doses. Upon entry into the large intestine (colon), bismuth is exposed to an anaerobic, sulfur-rich environment maintained by the gut microbiota. Here, it undergoes microbial methylation and sulfide complexation, yielding species such as trimethylbismuth (TMBi) and insoluble bismuth sulfide (Bi2S3), which is responsible for the black coloration of stool during therapy.
Osteoarthritis is a type of degenerative joint disease that results from breakdown of joint cartilage and underlying bone. A form of arthritis, it is believed to be the fourth leading cause of disability in the world, with an estimated 240 million people worldwide having activity-limiting osteoarthritis. The most common symptoms are joint pain and stiffness. Usually the symptoms progress slowly over years. Other symptoms may include joint swelling, decreased range of motion, and, when the back is affected, weakness or numbness of the arms and legs. The most commonly involved joints are the two near the ends of the fingers and the joint at the base of the thumbs, the knee and hip joints, and the joints of the neck and lower back. The symptoms can interfere with work and normal daily activities. Unlike some other types of arthritis, only the joints, not internal organs, are affected. Possible causes include previous joint injury, abnormal joint or limb development, and inherited factors. Risk is greater in those who are overweight, have legs of different lengths, or have jobs that result in high levels of joint stress. Osteoarthritis is believed to be caused by mechanical stress on the joint and low grade inflammatory processes. It develops as cartilage is lost and the underlying bone becomes affected. As pain may make it difficult to exercise, muscle loss may occur. Diagnosis is typically based on signs and symptoms, with medical imaging and other tests used to support or rule out other problems.
=== New approaches to target biofilms === The application of nanoparticles (NP) are one of novel promising techniques to target biofilms due to their high surface-area-to-volume ratio, their ability to penetrate to the deeper layers of biofilms and the capacity to releasing antimicrobial agents in a controlled way. Studying NP-EPS interactions could provide deeper understanding on how to develop more effective nanoparticles. "smart release" nanocarriers that can penetrate biofilms and be triggered by pathogenic microenvironments to deliver drugs or multifunctional compounds, such as catalytic nanoparticles to aptamers, dendrimers, and bioactive peptides) have been developed to disrupt the EPS and the viability or metabolic activity of the embedded bacteria. Some factors that would alter the potentials of the NP to transport antimicrobial agents into the biofilm include physicochemical interactions of the NP with EPS components, the characteristics of the water spaces (pores) within the EPS matrix and the EPS matrix viscosity. Size and surface properties (charge and functional groups) of the NPs are the major determinants of the penetration in and the interaction with the EPS. Another potential antibiofilm strategy is phage therapy. Bacteriophages, viruses that invade specific bacterial host cells, were suggested to be effective agents in penetrating biofilms.
In July 2021, the immersive family dining experience "Avengers: Quantum Encounter" at the Worlds of Marvel restaurant on the Disney Wish cruise ship was announced, which debuted when the cruise began voyages on July 14, 2022. The experience takes place during dinner with interactive elements and a full CGI recreation of the Wish's upper decks. Paul Rudd, Evangeline Lilly, Anthony Mackie, Brie Larson, Kerry Condon, and Iman Vellani reprised their MCU roles, while Ross Marquand voiced Ultron after previously doing so in What If...?, in which he replaced James Spader. Chris Waitt directed Rudd and Lilly's content, which was written by Steven Spiegel and featured visual effects by Framestore. The Marvels director Nia DaCosta filmed Vellani and Larson's content in London ahead of principal photography for the film. In September 2023, the Wish's sister ship the Disney Treasure was announced to also include the Worlds of Marvel restaurant with two nights of distinct shows and menus, featuring an appearance by Spider-Man. The Marvel Super Hero Academy is also included on the cruise, where young kids can train to be superheroes with Spider-Man, Black Panther, and Ant-Man. These were available on the Treasure when it began voyages on December 21, 2024.
Sources: en.wikipedia.org
== Oxygen-15 == Oxygen-15 (half-life 122.27 seconds) is the most stable radioisotope of oxygen, decaying by positron emission to nitrogen-15. It is thus the isotope of oxygen used in positron emission tomography (PET). It can be used in, among other things, water for PET myocardial perfusion imaging and for brain imaging. It is produced for this application through deuteron bombardment of nitrogen-14 using a cyclotron.
== Safety and side effects == Some anti-obesity medications can have severe, even lethal side effects, fen-phen being a famous example. Fen-phen was reported through the FDA to cause abnormal echocardiograms, heart valve problems, and rare valvular diseases. Out of 25 anti-obesity medications withdrawn from the market between 1964 and 2009, 23 acted by altering the functions of chemical neurotransmitters in the brain. The most common side effects of these drugs that led to withdrawals were mental disturbances, cardiac side effects, and drug abuse or drug dependence. GLP-1 receptor agonists are known to have common side effects including nausea and vomiting. Deaths were associated with seven products. Ephedra was removed from the US market in 2004 over concerns that it raises blood pressure and could lead to strokes and death.
==== August 2008 ==== Nezavisimaya Gazeta reported in June 2008 that when Chechen peacekeepers from Vostok Battalion began serving in South Ossetia in the autumn of 2007, they began arresting armed people with fake peacekeeping IDs. However, the Chechens were soon ordered to cease the arrest of the impostors and armed people with unknown affiliations were now freely roaming South Ossetia. On 4 August 2008, Life.ru reported that after the end of the "Kavkaz 2008" exercises, the paratroopers from Pskov remained to occupy the key positions on the Roki and Mamison passes on the border. Several battalions of 58th Army were deployed close to the border and the South Ossetian sources told the newspaper that the deployment of troops began on the night of 2–3 August 2008. Life.ru reported, "The deployment of the Russian military hardware near the Roki Tunnel will allow as soon as possible to move troops to help the peacemaking forces." On 6 August 2008, OsRadio reported that the volunteers were also arriving in Tskhinvali from Moscow. On 26 September 2008, Trud reported on the special battalion Vostok. One member of the battalion Khamzat said, "See what the "Red Star" wrote about us: Volunteers from neighboring republics arrive in South Ossetia. So we are volunteers?!" Khamzat added, "We are the regular subunit of 291-th Regiment of 42nd Guards Motor Rifle Division of the North Caucasus Military District. And we only act on orders." On 8 August 2008, Nezavisimaya Gazeta published an article by journalist who had spent previous three days in Chechnya.
== Taxonomy == Komodo dragons were first documented by Europeans in 1910, when rumors of a "land crocodile" reached Lieutenant van Steyn van Hensbroek of the Dutch colonial administration. Widespread notoriety came after 1912, when Peter Ouwens, the director of the Zoological Museum of Bogor, Java, published a paper on the topic after receiving a photo and a skin from the lieutenant, as well as two other specimens from a collector. The first two live Komodo dragons to arrive in Europe were exhibited in the Reptile House at London Zoo when it opened in 1927. Joan Beauchamp Procter made some of the earliest observations of these animals in captivity and she demonstrated their behaviour at a scientific meeting of the Zoological Society of London in 1928.
Therefore, before agreeing to any surgery, the plastic surgeon evaluates and considers the woman's mental health to determine if breast implants can positively affect her self-esteem and sexual functioning.
Sources: en.wikipedia.org
Dihexa is a synthetic peptide investigated in preclinical research. It is often classified as an angiotensin IV analog or an HGF mimetic. It is not an approved medicine.
No. Regulatory agencies have not approved dihexa for human use. It is sold as a research chemical in some markets, and human safety and efficacy data are lacking.
Laboratory studies have examined its effects on synapse formation and cognitive tasks in animals. These are early-stage findings. They do not prove benefits or safety in people.
The lyophilized powder is generally stored at -20 °C or lower, desiccated, and protected from light. Solutions are often aliquoted to avoid repeated freeze-thaw cycles. Specific stability data may vary by formulation and purity.