Angiotensin IV analog comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-07-20. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Research interest in dihexa centers on its ability to promote synapse formation in cultured neurons and in some rodent experiments. These findings have been interpreted as a possible mechanism for learning and memory effects, but the evidence remains preliminary. Independent replication is limited, and study designs vary widely in species, duration, and outcome measures. Human data are scarce, so claims about cognitive enhancement in people are not supported by robust clinical evidence. The gap between laboratory signals and proven clinical benefit is substantial.
Dihexa appears in scientific literature, patent documents, and commercial catalogs under several names, which can complicate searching and verification. The compound is frequently grouped with nootropics or research chemicals, terms that describe context of use rather than regulatory approval. Such labeling may imply benefits that have not been confirmed in controlled human studies. Readers encountering promotional descriptions should distinguish between preclinical observations and established medical facts. The absence of regulatory approval is a central feature of its current status.
| Property | Value | Notes |
|---|---|---|
| Common name | Dihexa | Shorthand used in research literature and supplier catalogs. |
| CAS Registry Number | 1401708-83-5 | Identifier assigned to the synthetic peptide. |
| Molecular formula | C27H44N4O5 | Reported formula; verify with a certificate of analysis. |
| Appearance | White to off-white powder | Typical form for lyophilized research peptides. |
| Typical storage | −20 °C or below, desiccated | Common condition for peptide stability. |
Dihexa occupies an uncertain regulatory space in many countries. It is not generally listed as an approved therapeutic, and some jurisdictions may treat it as a research chemical, a compounded substance, or an unapproved new drug depending on claims and distribution. Importation can be restricted, and suppliers may require documentation that the material is for laboratory research only. Quality and labeling vary, so buyers should request analytical data, verify lot numbers, and understand local rules. These factors make sourcing and compliance part of the practical context around dihexa.
Lyophilized dihexa is typically stored as a dry powder at or below minus twenty degrees Celsius. Cooler temperatures slow degradation, and desiccant protection limits moisture uptake. Repeated temperature cycling can accelerate breakdown, so aliquoting before storage is common in laboratory practice. Solutions are generally less stable than dry powder and are often kept cold, protected from light, and used within a defined period. Specific stability data for dihexa are limited, and handling recommendations often follow general peptide guidelines rather than compound-specific studies.
Identity and purity are usually assessed with reverse-phase high-performance liquid chromatography and mass spectrometry. These methods can separate related impurities and confirm molecular mass, but they do not by themselves establish biological activity. Certificate of analysis documents may report purity as a percentage by area, yet the exact meaning can vary between laboratories. Independent testing can check for residual solvents, counterions, or microbial contamination when relevant. For research use, matching analytical records to a specific lot helps trace experimental variability.
The proposed mechanism involves interaction with the hepatocyte growth factor (HGF) system and its receptor, c-Met. Dihexa is described in some studies as an HGF mimetic, meaning it may mimic or enhance HGF-mediated signaling. Activation of c-Met can influence cell growth, survival, and cytoskeletal remodeling, pathways that intersect with synaptic plasticity. However, the precise binding targets and downstream events for dihexa are not fully established, and alternative mechanisms have been suggested.
Dihexa is a synthetic peptide with the chemical name N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide, and it is structurally related to angiotensin IV, a naturally occurring peptide fragment. Researchers developed it as a modified analog intended to alter stability and activity relative to the parent peptide. Its short sequence and fatty acid chain distinguish it from many endogenous peptides, and published studies often describe it under the abbreviation dihexa. The compound is classified as a laboratory compound rather than an approved therapeutic in most jurisdictions.
Heavy-metal contamination of spirulina supplements has also raised concern. The Chinese State Food and Drug Administration reported that lead, mercury, and arsenic contamination was widespread in spirulina supplements marketed in China. One study reported the presence of lead up to 5.1 ppm in a sample from a commercial supplement. Spirulina doses of 10 to 19 grams per day over several months have been used safely.
A drug that is not FDA licensed for use in humans, or as a treatment for a particular condition (NLM) A substance that has been tested in a laboratory and has gotten approval from the U.S. Food and Drug Administration (FDA) to be tested in people. A drug may be approved by the FDA for use in one disease or condition but be considered experimental or investigational in other diseases or conditions. Also called investigational drug. (NCI)
== Etymology == The word "soy" derives from the Japanese soi, a Kagoshima dialect variant of shōyu, which in turn comes from the Chinese jiangyou (醬油), meaning "soy sauce". The name of the genus, Glycine, comes from Linnaeus. When naming the genus, Linnaeus observed that one of the species formerly within the genus, which has since been reclassified to the genus Apios, had a sweet root. Based on the sweetness, the Greek word for sweet, glykós, was Latinized.
absolute zero A theoretical condition concerning a system at the lowest limit of the thermodynamic temperature scale, or zero kelvins, at which the system does not emit or absorb energy (i.e. all atoms are at rest). By extrapolating the ideal gas law, the internationally agreed-upon value for absolute zero has been determined as −273.15 °C (−459.67 °F; 0.00 K).
Sources: en.wikipedia.org
=== Chromatographic compression and spectral deconvolution === Unique VUV absorbance spectra not only enable unambiguous compound identification, and allows GC run times to be deliberately shortened. VUV detectors operate at ambient pressure and are thus not flow rate limited. GC run times can be reduced by increasing the GC column flow and oven temperature program rates. Flow rate-enhanced chromatographic compression utilizes VUV spectral deconvolution to resolve any co-elution that may result from shortening GC runtimes. VUV absorption is additive, meaning that overlapping peaks give a spectrum that corresponds to the sum absorbance of each compound. The individual contribution of each analyte can be determined if the VUV spectra for co-eluting compounds are stored in the VUV library. The ability to differentiate coeluting analyte spectra and use them to deconvolve the overlapping signals is demonstrated in Figure 4. The individual spectra of terpenes limonene and p-cymene are shown in Panel A along with the summed absorbance of the selected retention time window (blue region in Panel B) and the fit with VUV library spectra. The R2 >0.999 fit result confirms their identities, and enables the deconvolution of these and other terpenes analyzed by GC-VUV as featured in Panel B.
==== Surveys ==== The World Mental Health survey initiative has suggested a plan for countries to redesign their mental health care systems to best allocate resources. "A first step is documentation of services being used and the extent and nature of unmet treatment needs. A second step could be to do a cross-national comparison of service use and unmet needs in countries with different mental health care systems. Such comparisons can help to uncover optimum financing, national policies, and delivery systems for mental health care." Knowledge of how to provide effective emotional mental health care has become imperative worldwide. Unfortunately, most countries have insufficient data to guide decisions, absent or competing visions for resources, and near-constant pressures to cut insurance and entitlements. WMH surveys were done in Africa (Nigeria, South Africa), the Americas (Colombia, Mexico, United States), Asia and the Pacific (Japan, New Zealand, Beijing and Shanghai in China), Europe (Belgium, France, Germany, Italy, Netherlands, Spain, Ukraine), and the Middle East (Israel, Lebanon). Countries were classified with World Bank criteria as low-income (Nigeria), lower-middle-income (China, Colombia, South Africa, Ukraine), higher middle-income (Lebanon, Mexico), and high-income. The coordinated surveys on emotional mental health disorders, their severity, and treatments were implemented in the aforementioned countries. These surveys assessed the frequency, types, and adequacy of mental health service use in 17 countries in which WMH surveys are complete.
=== Interest in William James === During his first trip to the United States with Freud, Jung was introduced to the elder philosopher and psychologist William James, known as the "Father of American psychology," whose ideas Jung would incorporate into his own work. Jung connected with James around their mutual interests in mysticism, spiritualism and psychical phenomena. James wrote to a friend after the conference stating Jung "left a favorable impression," while "his views of Freud were mixed." James died about eleven months later. The ideas of both Jung and James, on topics including hopelessness, self-surrender, and spiritual experiences, were influential in the development and founding of the international altruistic, spiritual movement Alcoholics Anonymous on 10 June 1935, in Akron, Ohio, a quarter of a century after James' death and in Jung's sixtieth year.
Dover grew further after the Norman invasion of 1066 as a member of the Confederation of Cinque Ports. After the martyrdom of Archbishop Thomas Becket at Canterbury Cathedral in 1170, Dover flourished as the only designated port of entry for foreign pilgrims and as a point of departure for the third and subsequent crusades. Following Edward III's success at the Battle of Sluys in 1340, a large defensive wall was built around the town. Although few concerted attempts to manage the shingle deposits blocking the harbour entrance were made during the late Middle Ages, a short pier and two defensive towers were constructed at the port in years immediately prior to Henry VIII's departure to the royal summit known as the Field of the Cloth of Gold in 1520.
== Shelf-life and safety == The purpose of IMF foods is to achieve a water activity that the food can be stored safely without refrigeration. However, the food is not sterile. Staphylococcus aureus is a microorganism of concern as it can grow and produce specific enterotoxins in water activities of 0.83-0.86 under aerobic conditions. Because of this, proper handling, storage, hygiene and good manufacturing practices are necessary to prevent Staphylococcus aureus. Molds of Aspergillis and Penicillium species can grow and produce harmful mycotoxins at water activity 0.77-0.85. Salmonella and Bacillus cereus are the primary pathogens of concern with low-moisture foods and IMFs. Most illnesses associated with low-moisture foods or IMFs have been caused by Salmonella spp. To reduce the risk of bacterial growth, products are treated with a combination of low pH, addition of sugar, salt and preservatives, and a thermal process that can eliminate pathogens and extend shelf-life. In the case of yeasts and molds, chemical preservatives such as sorbates and propionates are used to inhibit their growth.
Sources: en.wikipedia.org
Insulin potentiation therapy (IPT) is an unproven alternative cancer treatment using insulin as an adjunct to low-dose chemotherapy. It was promoted by a paper in the controversial and non-peer reviewed journal Medical Hypotheses. It is not an evidence-based cancer treatment, and the costs of IPT are not covered by health insurance. According to Quackwatch, "Insulin Potentiation Therapy (IPT) is one of several unproven, dangerous treatments that is promoted by a small group of practitioners without trustworthy evidence that it works."
Increasing the water permeability of cortical collecting tubules (CCT), as well as outer and inner medullary collecting duct (OMCD & IMCD) in the kidney, thus allowing water reabsorption and excretion of more concentrated urine, i.e., antidiuresis. This occurs through increased transcription and insertion of water channels (Aquaporin-2) into the apical membrane of collecting tubule and collecting duct epithelial cells. Aquaporins allow water to move down their osmotic gradient and out of the nephron, increasing the amount of water re-absorbed from the filtrate (forming urine) back into the bloodstream. This effect is mediated by V2 receptors. Vasopressin also increases the concentration of calcium in the collecting duct cells, by episodic release from intracellular stores. Vasopressin, acting through cAMP, also increases transcription of the aquaporin-2 gene, thus increasing the total number of aquaporin-2 molecules in collecting duct cells. Increasing permeability of the inner medullary portion of the collecting duct to urea by regulating the cell surface expression of urea transporters, which facilitates its reabsorption into the medullary interstitium as it travels down the concentration gradient created by removing water from the connecting tubule, cortical collecting duct, and outer medullary collecting duct. Acute increase of sodium absorption across the ascending loop of Henle. This adds to the countercurrent multiplication which aids in proper water reabsorption later in the distal tubule and collecting duct.
Prostaglandin E1 (PGE1) is a naturally occurring prostaglandin with various medical uses. Alprostadil and misoprostol are synthetic forms of prostaglandin E1 used as medications. Lubiprostone, a derivative of prostaglandin E1, is also used as a medication. Prostaglandin E1 is a vasodilator. It has various effects in the body that include opening blood vessels, relaxing smooth muscle, inhibiting clotting, and causing uterine contractions. In infants with certain congenital heart defects, alprostadil is delivered by slow injection into a vein to maintain a patent ductus arteriosus until surgery can be carried out. By injection into the penis or placement in the urethra, alprostadil is used to treat erectile dysfunction. Common side effects when given to babies include decreased breathing, fever, and low blood pressure. When injected into the penis for erectile dysfunction; side effects may include penile pain, bleeding at the site of injection, and prolonged erection (priapism). Prostaglandin E1 was isolated in 1957 and approved for medical use in the United States in 1981. Misoprostol has various obstetric uses. It is used to induce abortion, to completely empty the uterus after a miscarriage, to induce labor, and to prevent and treat postpartum hemorrhage. The medication is available through many routes. It can be swallowed, dissolved in the mouth, placed in the vagina, or placed in the rectum. Misoprostol can also be used to manage duodenal ulcers and peptic ulcer disease when other medications are not effective.
=== 1973 === January 27: The Paris Peace Accords end American involvement in the Vietnam War. Congress cuts off funds for the continued bombing of Indochina. February: Balochi separatists launched a five-year long guerilla war against the Pakistani government in order to create a separate Balochistan nation. February 21: Vientiane Treaty is signed as a cease-fire agreement for the Laotian Civil War. The treaty calls for the removal of all foreign soldiers from Laos . The treaty calls for a coalition government to be created but never materialized. July 10: The Bahamas becomes independent from the UK. July 29: To help further legitimize their rule, the Greek Junta abolished the Greek monarchy after a sham referendum. September: West Germany and East Germany are each admitted to the United Nations. September 11: Chilean coup d'état — The democratically elected Marxist president of Chile, Salvador Allende, is deposed and dies of a gunshot wound during a military coup led by General Augusto Pinochet. October 6: Yom Kippur War — Israel is attacked by Egypt and Syria, the war ends with a ceasefire. October 14: An uprising occurred in Thailand. October 22: Egypt defects to the American camp by accepting a U.S. cease-fire proposal during the October 1973 war. November 11: The Soviet Union announces that, because of its opposition to the recent overthrow of the government of Chilean President Salvador Allende, it will not play a World Cup Soccer match against the Chilean team if the match is held in Santiago.
However, modern manufactured chalk is mostly gypsum, hydrated calcium sulfate CaSO4·2H2O. Calcium carbonate is a main source for growing biorock. Precipitated calcium carbonate (PCC), pre-dispersed in slurry form, is a common filler material for latex gloves with the aim of achieving maximum saving in material and production costs. Fine ground calcium carbonate (GCC) is an essential ingredient in the microporous film used in diapers and some building films, as the pores are nucleated around the calcium carbonate particles during the manufacture of the film by biaxial stretching. GCC and PCC are used as a filler in paper because they are cheaper than wood fiber. Printing and writing paper can contain 10–20% calcium carbonate. In North America, calcium carbonate has begun to replace kaolin in the production of glossy paper. Europe has been practicing this as alkaline papermaking or acid-free papermaking for some decades. PCC used for paper filling and paper coatings is precipitated and prepared in a variety of shapes and sizes having characteristic narrow particle size distributions and equivalent spherical diameters of 0.4 to 3 micrometers. Calcium carbonate is widely used as an extender in paints, in particular matte emulsion paint where typically 30% by weight of the paint is either chalk or marble. It is also a popular filler in plastics. Some typical examples include around 15–20% loading of chalk in unplasticized polyvinyl chloride (uPVC) drainpipes, 5–15% loading of stearate-coated chalk or marble in uPVC window profile.
Sources: en.wikipedia.org
Dihexa is a synthetic peptide modeled on angiotensin IV. It is used in laboratory and animal research, not as an approved medicine. Human effects remain poorly characterized.
It is produced by chemical synthesis, not extracted from plants or animals. Its design is based on a naturally occurring peptide fragment. Suppliers sell it as a research chemical.
No, dihexa is a modified analog of angiotensin IV. The two share a structural relationship but differ in chemical details. Research on one does not automatically apply to the other.
Dihexa is a synthetic peptide-like compound studied in preclinical research. It is often described as an angiotensin IV analog, but it is not an approved medicine. Public information comes mainly from laboratory work and commercial listings.