A practical reference on Heptapeptide: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-02-18 and is reviewed periodically as new material appears.
Scientific literature on semax is unevenly distributed. A substantial share of published work originates from a small number of laboratories in Russia, while independent replication elsewhere is limited. Human data consist mostly of small trials with short follow-up, and several reported outcomes rely on subjective rating scales. Questions about how much intact peptide reaches the central nervous system after nasal administration, and how long it persists there, are still unresolved. The compound is best described as an active research subject rather than a settled pharmacological agent.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It was derived from the ACTH(4-10) fragment, a short segment of adrenocorticotropic hormone that lacks the hormonal activity associated with the full-length peptide. Researchers at the Institute of Molecular Genetics in Moscow developed the compound during the 1980s. It has been registered as a pharmaceutical product in Russia and several neighbouring countries, where it is supplied as a nasal solution, and it is also sold internationally as a research chemical.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
The compound was developed in the 1980s at the Institute of Molecular Genetics in Moscow, where it emerged from research on short ACTH fragments and their effects on the central nervous system. Russian pharmaceutical listings describe it as a nootropic and neuroprotective agent, most often formulated as nasal drops. It is not a marketed medicine in the United States or the European Union, and no pharmacopoeial monograph covers it. Consequently, most published clinical experience with the substance originates from a small number of research centres, mainly in Russia and neighbouring countries.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Calculated for the free peptide |
| Molar mass | 813.9 g/mol | Anhydrous free base |
| Peptide class | Synthetic heptapeptide | ACTH(4-10) analogue |
| Parent fragment | ACTH(4-10) | Adrenocorticotropic hormone segment |
| Developmental origin | Institute of Molecular Genetics, Moscow | Work began in the 1980s |
Development of the compound took place in the Soviet Union during the 1980s, largely through peptide research groups affiliated with the Shemyakin-Ovchinnikov Institute and Moscow State University. Investigators screened fragments of adrenocorticotropic hormone for activity on the central nervous system while attempting to separate cognitive effects from hormonal ones. The shortened sequence was selected because it retained behavioral activity in animal models without stimulating corticosteroid release. Early publications described the molecule as an ACTH(4-10) analog.
Published research on this peptide originates mainly from Russian laboratories, and the wider international literature is comparatively thin. Studies have used rodent models of stroke, hypoxia, and memory tasks, with a smaller number of human trials reported. Reported outcomes include changes in attention and memory measures, along with effects on neurotrophic factor expression in some experiments. Small sample sizes, inconsistent dosing protocols, and limited independent replication are widely noted limitations, so the strength of the clinical evidence remains an open question.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. The first four residues correspond to the ACTH(4-10) fragment, while the terminal Pro-Gly-Pro extension was added to improve metabolic stability. Its molecular formula is C37H51N9O10S and its monoisotopic mass is approximately 813.9 Da. The compound is classified as a peptide research chemical and as a registered pharmaceutical product in Russia, but it does not hold marketing approval in the European Union or the United States. Naming conventions vary across supplier catalogs.
=== Chronic === Assessment of the effects of stimulants is relevant given the large population currently taking stimulants. A 2022 meta-analysis with a sample size of just under four million people found no association between the use of prescription stimulants and the development of cardiovascular disease in any age group. A review of a year long period of prescription stimulant use in those with attention deficit hyperactivity disorder (ADHD) found that cardiovascular side effects were limited to transient increases in blood pressure only. However, a 2024 systematic review of the evidence found that stimulants overall improve ADHD symptoms and broadband behavioral measures in children and adolescents, though they carry risks of side effects like appetite suppression and other adverse events. Initiation of stimulant treatment in those with ADHD in early childhood appears to carry benefits into adulthood in social and cognitive functioning, and appears to be relatively safe. Abuse of prescription stimulants (not following physician instruction) or of illicit stimulants carries many negative health risks. Abuse of cocaine, depending upon route of administration, increases risk of cardiorespiratory disease, stroke, and sepsis.
Will Self, novelist (Jewish mother); son of Peter Self, and grandson of Sir Albert Henry Self Charles Gabriel Seligman FRS FRAI (né Seligmann; 24 December 1873 – 19 September 1940) was author, scholar, academic, physician and ethnologist; main ethnographic work described culture of Vedda people of Sri Lanka and Shilluk people of Sudan; was professor at London School of Economics; influential as the teacher of Bronisław Malinowski, E. E. Evans-Pritchard, and Meyer Fortes; was proponent of the Hamitic hypothesis, according to which some civilisations of Africa were thought to have been founded by Caucasoid Hamitic peoples. His work in the 1920s and 1930s is now seen as "white supremacist". Nicholas Serota (born 27 April 1946), author, art historian and curator; served as Director of the Tate from 1988 to 2017; currently Chair of Arts Council England; was previously Director of The Museum of Modern Art, Oxford, and Director of the Whitechapel Gallery, before becoming Director of the Tate; was also Chairman of the Turner Prize jury. Malcolm Shaw (academic) KC (born 1947), British legal academic, author, editor and lawyer; studied at University of Liverpool (LLB), Hebrew University of Jerusalem (LLM) and Keele University (PhD); was the Sir Robert Jennings Professor of International Law at the University of Leicester and taught international law, human rights and equity and trusts; appointed as Senior Fellow at Lauterpacht Centre for International Law at University of Cambridge; Trustee of the British Institute of International and Comparative Law.
== Types == Anisocytosis may be assessed using the red blood cell distribution width (RDW), while the average size of red blood cells is measured by the mean corpuscular volume (MCV). Based on the MCV, anisocytosis may be associated with microcytic, macrocytic, or normocytic red blood cells. Anisocytosis with microcytosis may occur in conditions such as iron-deficiency anemia and sickle cell disease. Anisocytosis with macrocytosis may occur in folate deficiency, vitamin B12 deficiency, autoimmune hemolytic anemia, following cytotoxic chemotherapy, and in chronic liver disease or myelodysplastic syndrome. Anisocytosis with a normal MCV may be seen in early iron, vitamin B12, or folate deficiency, as well as in dimorphic anemia, sickle cell disease, chronic liver disease, and myelodysplastic syndrome. The RDW is typically increased in iron-deficiency anemia, whereas it may be normal or only mildly increased in some forms of thalassemia, including thalassemia major (Cooley anemia) and thalassemia intermedia.
Chemoselectivity of NCL : No side-products are formed from reaction with the other functional groups present in either peptide segment (e.g. Asp, Glu side chain carboxylic acids; Lys epsilon amino group; Tyr phenolic hydroxyl; Ser, Thr hydroxyls, etc.).
=== DNA damage === Aging is the most important risk factor for cardiovascular problems. The causative basis by which aging mediates its impact, independently of other recognized risk factors, remains to be determined. Evidence has been reviewed for the key role of DNA damage in vascular aging. 8-oxoG, a common type of oxidative damage in DNA, is found to accumulate in plaque vascular smooth muscle cells, macrophages and endothelial cells, thus linking DNA damage to plaque formation. DNA strand breaks also increased in atherosclerotic plaques. Werner syndrome (WS) is a premature aging condition in humans. WS is caused by a genetic defect in a RecQ helicase that is employed in several repair processes that remove damage from DNA. WS patients develop a considerable burden of atherosclerotic plaques in their coronary arteries and aorta: calcification of the aortic valve is also frequently observed. These findings link excessive unrepaired DNA damage to premature aging and early atherosclerotic plaque development (see DNA damage theory of aging).
Sources: en.wikipedia.org
=== Microanatomy === When a slice of hyaline cartilage is examined under the microscope, it is shown to consist of chondrocytes of a rounded or bluntly angular form, lying in groups of two or more in a granular, or almost homogeneous matrix. When arranged in groups of two or more, the chondrocytes have rounded, but generally straight outlines, where they are in contact with each other, and in the rest of their circumference, they are rounded. They consist of translucent protoplasm with fine interlacing filaments and minute granules are sometimes present. Embedded in this are one or two round nuclei, having the usual intranuclear network. The cells are contained in cavities in the matrix, called cartilage lacunae. These cavities are actually artificial gaps formed from the shrinking of the cells during the staining and setting of the tissue for examination. The inter-territorial space between the isogenous cell groups contains relatively more collagen fibers, allowing it to maintain its shape while the actual cells shrink, creating the lacunae. This constitutes the so-called 'capsule' of the space. Each lacuna is usually occupied by a single cell, but during mitosis, it may contain two, four, or even eight cells.
In embryogenesis, the skeletal system is derived from the mesoderm germ layer. Chondrification (also known as chondrogenesis) is the process by which cartilage is formed from condensed mesenchyme tissue, which differentiates into chondroblasts and begins secreting the molecules (aggrecan and collagen type II) that form the extracellular matrix. In all vertebrates, cartilage is the main skeletal tissue in early ontogenetic stages; in osteichthyans, many cartilaginous elements subsequently ossify through endochondral and perichondral ossification. Following the initial chondrification that occurs during embryogenesis, cartilage growth consists mostly of the maturing of immature cartilage to a more mature state. The division of cells within cartilage occurs very slowly, and thus growth in cartilage is usually not based on an increase in size or mass of the cartilage itself. It has been identified that non-coding RNAs (e.g. miRNAs and long non-coding RNAs) as the most important epigenetic modulators can affect the chondrogenesis. This also justifies the non-coding RNAs' contribution in various cartilage-dependent pathological conditions such as arthritis, and so on.
Bird skeletons are very lightweight. Their bones are smaller and thinner than those of mammals, to aid flight. Among mammals, bats come closest to birds in terms of bone density, suggesting that small dense bones are a flight adaptation. Many bird bones have little marrow due to them being hollow. A bird's beak is primarily made of bone as projections of the mandibles which are covered in keratin. Some bones, primarily formed separately in subcutaneous tissues, include headgears (such as bony core of horns, antlers, ossicones), osteoderm, and os penis/os clitoris. A deer's antlers are composed of bone which is an unusual example of bone being outside the skin of the animal once the velvet is shed. The extinct predatory fish Dunkleosteus had sharp edges of hard exposed bone along its jaws. The proportion of cortical bone that is 80% in the human skeleton may be much lower in other animals, especially in marine mammals and marine turtles, or in various Mesozoic marine reptiles, such as ichthyosaurs, among others. This proportion can vary quickly in evolution; it often increases in early stages of returns to an aquatic lifestyle, as seen in early whales and pinnipeds, among others. It subsequently decreases in pelagic taxa, which typically acquire spongy bone, but aquatic taxa that live in shallow water can retain very thick, pachyostotic, osteosclerotic, or pachyosteosclerotic bones, especially if they move slowly, like sea cows.
=== Interactions with IgG and serum albumin === In addition to binding to IgG, FCGRT has been shown to interact with human serum albumin. FcRn-mediated transcytosis of IgG across epithelial cells is possible because FcRn binds IgG at acidic pH (<6.5) but not at neutral or higher pH. The binding site for FcRn on IgG has been mapped using functional and structural studies, and involves in the interaction of relatively well conserved histidine residues on IgG with acidic residues on FcRn.
Sources: en.wikipedia.org
Barbiturates (e.g., pentobarbital, sodium thiopental) – non-selective Ethanol – non-selective Inhalational anaesthetics (e.g., cyclopropane, enflurane, halothane, isoflurane, sevoflurane) – non-selective GYKI-52466 Irampanel Perampanel Talampanel PEP1-TGL : GluA1 subunit C-terminus peptide analog that inhibits AMPA receptor incorporation to the postsynaptic density
Neal, a supporter of the Democratic presidential nominee Jimmy Carter, polled almost the same raw vote as Mizell had four years earlier, when he was running on the Nixon–Agnew slate. During his time in Congress, Mizell was one of the most conservative legislators in Washington, as evidenced by his 1972 rating of "0" from the liberal Americans for Democratic Action. Richard Goldstein of The New York Times called Mizell "a staunch defender of his home state's tobacco industry." Yet Robert Mitchell, historian who studied Stephen Neal, observed that Mizell supported legislation that curtailed tobacco exports. Mizell enjoyed success in the annual Congressional Baseball Game, striking out seven Democrats in a row on one occasion. The Democrats insisted that he play a different position in 1970 (right field); otherwise, they refused to play. In 1974, he was forced to play center field, but he had two runs batted in. Looking back on his time in Congress, Mizell said, "I used to look at it like this: After I was elected to Congress, I thought of my constituency in the same way I thought of the fans in St. Louis and Pittsburgh who watched me pitch. They expected, and I tried to give them, my best. There's another similarity between Congress and sports. The cloakroom is quite a bit like the clubhouse."
=== Visual effects === The companies that were in charge of creating the visual effects for the season were Pixomondo, Rocket Science VFX, MPC Episodic, Soho VFX, Ingenuity Studios, Rising Sun Pictures, Studio 8, and Outpost VFX. Stephan Fleet was in charge of being the VFX supervisor once again after working for the previous seasons. Fleet revealed that the season would have bigger visual effects than the previous seasons but will keep the characters and story that was created by the creators of the series. Laz Alonso revealed that the season used over three times the amount of blood more than the previous season: "I'll put it to you this way. I was talking to the head makeup artist and she's in charge of ordering the blood — that's one of her many jobs. She told me that all of Season 2 ... When you talk about bulk, I don't think they used over a gallon of blood in Season 2, believe it or not. Season 3, we're already at three and a half gallons of blood. So that should give you a little indication of where it's going." Rocket Science VFX was in charge of the creation of series fire explosions, Soldier Boy's powers, and the body and head explosions, by taking a 3D environment work since the creation of the effects would be heavier. To achieve Soldier Boy's powers, the crew looked for real radioactive blast to have them combined with FX fire and make blast simulations. Rising Sun Pictures worked to get the effects of the destruction provoqued through the series and captured over 100 shots during the season.
Carbamazepine and its bio-transformation products have been detected in wastewater treatment plant effluent and in streams receiving treated wastewater. Field and laboratory studies have been conducted to understand the accumulation of carbamazepine in food plants grown in soil treated with sludge, which vary with respect to the concentrations of carbamazepine present in sludge and in the concentrations of sludge in the soil. Taking into account only studies that used concentrations commonly found in the environment, a 2014 review concluded that "the accumulation of carbamazepine into plants grown in soil amended with biosolids poses a de minimis risk to human health according to the approach."
channel protein A type of transmembrane protein whose shape forms an aqueous pore in a membrane, permitting the passage of specific solutes, often small ions, across the membrane in either or both directions.
Sources: en.wikipedia.org
Semax is based on the ACTH(4-10) fragment, a seven-amino-acid segment of adrenocorticotropic hormone. The synthetic peptide retains the core sequence while removing regions associated with endocrine activity. This modification is intended to isolate effects on the nervous system.
It is registered for clinical use in Russia and a few other countries, typically as a nasal drop formulation. It does not hold approval from the United States Food and Drug Administration or the European Medicines Agency. Outside those markets it is generally handled as a research chemical.
The compound was developed in Moscow and the earliest studies were conducted there, so the primary literature is largely in Russian-language journals. Translation and indexing have been incomplete, which limits access for outside researchers. Independent groups have since published some work, but the total volume remains modest.
It is described as a synthetic analogue of the ACTH(4–10) fragment, a short segment of adrenocorticotropic hormone. Its sequence differs from that fragment and includes two proline residues, which influence stability and behaviour in solution.