intranasal route 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.
Last reviewed on 2025-08-20. Where a claim depends on a specific study, the study is described rather than over-claimed.
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
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.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide (ACTH fragment analog) | Not a steroid; does not belong to the melanocortin agonist drugs by marketing category |
| Molecular formula | C37H51N9O10S (commonly cited) | Reported values vary slightly with salt and counter-ion content |
| Appearance | White to off-white lyophilized powder | A single batch may appear as a loose cake or fluffy solid |
| Solubility | Freely soluble in water and aqueous buffer | Stock solutions are usually prepared in sterile water or saline |
| Typical storage | −20 °C or below, desiccated and protected from light | Seal opened vials promptly to limit moisture uptake |
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
Thus, because vibrational and rotational energy levels are more closely spaced than electronic energy levels, heat is more easily transferred between substances relative to light or other forms of electronic energy. For example, ultraviolet electromagnetic radiation is not transferred with as much efficacy from one substance to another as thermal or electrical energy. The existence of characteristic energy levels for different chemical substances is useful for their identification by the analysis of spectral lines. Different kinds of spectra are often used in chemical spectroscopy, e.g. IR, microwave, NMR, ESR, etc. Spectroscopy is also used to identify the composition of remote objects – like stars and distant galaxies – by analyzing their radiation spectra.
On 3 April 2007, The Boston Globe reported that tainted wheat gluten ended up in factories that produce food for human consumption. Then, on 19 April, federal U.S. officials said that they were investigating reports that Binzhou Futian rice protein had been used in hog feed, but declined to specify where. The California Department of Food and Agriculture placed American Hog Farm in Ceres, California under quarantine, after melamine was found in the urine of the hogs on the farm. According to California state officials, approximately 45 state residents consumed pork from hogs that had been fed melamine-contaminated feed. The FDA subsequently discovered that melamine was present in feed that had been given to hogs in California, New York, North Carolina, South Carolina, Utah, and possibly Ohio. In response, the FDA announced that, in addition to its existing practice of testing of wheat gluten and rice protein products for melamine, it would begin testing imported ingredients and finished products that contain cornmeal, corn gluten, rice bran and soy protein for the presence of melamine or cyanuric acid. The agency also subjected all vegetable proteins imported from China, intended for human or animal consumption, to detention without physical examination, beginning on 27 April. Finally, the FDA investigated domestic food manufacturers to ensure that no contaminated product was being used in foods intended for human use.
Leslie Stephen Ettre (September 16, 1922 – June 1, 2010) was a Hungarian-American analytical chemist and scientist who was known for his contributions to the field of chromatography, in particular open-tubular gas chromatography, as well as to documentation of the history of chromatography.
=== United States === Emotional mental illnesses is a particular concern in the United States since the U.S. has the highest annual prevalence rates (26 percent) for mental illnesses among a comparison of 14 developing and developed countries. While approximately 80 percent of all people in the United States with a mental disorder eventually receive some form of treatment, on average persons do not access care until nearly a decade following the development of their illness, and less than one-third of people who seek help receive minimally adequate care. The government offers everyone programs and services, but veterans receive the most help, there is certain eligibility criteria that has to be met.
After a manufacturer has decided what true expiration date it has set, then it will decide another date to make public and advertise on the packaging of the drug. The printed expiration date will always be sooner than the true expiration date, because the drug should always be effective and safe before the labeled expiration date if kept properly.
Sources: en.wikipedia.org
== Properties == This compound is a yellow crystalline powder with moderate human toxicity. It shows two polymorphs in the crystalline state. The alpha-form is colorless pillars, unstable at room temperature, and stable toward sunlight. The beta-form is yellow pillars, stable at room temperature, and gradually turns red upon irradiation of sunlight. Usually 4-nitrophenol exists as a mixture of these two forms.
Consumption of fruit, nectar, pollen and other plant material occurs in megabats and New World leaf-nosed bats. Bats prefer ripe fruit and typically pull it from a tree and travel somewhere else to feed, possibly to avoid predators, though larger megabats may eat on site at the fruiting tree. The Jamaican fruit bat (Artibeus jamaicensis) has been recorded carrying fruit weighing as much as 50 g (1.8 oz). Many species of plants depend on bats for seed dispersal. Fruit-eating bats sometimes chew leaves to suck up the moisture and then spit them out. Bats apparently cannot digest cellulose. Nectar-eating bats have acquired specialised adaptations. These bats possess long muzzles and long, extensible tongues covered in fine bristles that aid them in feeding on particular flowers and plants. The tube-lipped nectar bat (Anoura fistulata) has a proportionally longer tongue than any mammal and is the only species capable of reaching deep into the flowers of Centropogon nigri. When the tongue retracts, it is pulled inside the rib cage. Because of these features, nectar-feeding bats cannot easily turn to other food sources in times of scarcity, making them more at risk of extinction than other species. Nectar feeding also aids a variety of plants, since these bats serve as pollinators, as pollen attaches to their fur while they feed. Around 500 species of flowering plant rely on bat pollination and thus tend to open their flowers at night. Many rainforest and Mediterranean plants depend on bat pollination.
The vagina is a structure of animals in which the female is internally fertilized, rather than by traumatic insemination used by some invertebrates. Although research on the vagina is especially lacking for different animals, its location, structure and size are documented as varying among species. In therian mammals (placentals and marsupials), the vagina leads from the uterus to the exterior of the female body. Female placentals have two openings in the vulva; these are the urethral opening for the urinary tract and the vaginal opening for the genital tract. Depending on the species, these openings may be within the internal urogenital sinus or on the external vestibule. Female marsupials have two lateral vaginas, which lead to separate uteri, but both open externally through the same orifice; a third canal, which is known as the median vagina, and can be transitory or permanent, is used for birth. The female spotted hyena does not have an external vaginal opening. Instead, the vagina exits through the clitoris, allowing the females to urinate, copulate and give birth through the clitoris. In female canids, the vagina contracts during copulation, forming a copulatory tie. Female cetaceans have vaginal folds that are not found in other mammals. Monotremes, birds, reptiles and amphibians have a cloaca and is the single external opening for the gastrointestinal, urinary, and reproductive tracts. Some of these vertebrates have a part of the oviduct that leads to the cloaca. Chickens have a vaginal aperture that opens from the vertical apex of the cloaca.
==== Pure collagen scaffolds ==== Collagen is the primary component of the extracellular matrix. Collagen scaffolds efficiently support fibroblast growth, which in turn allows keratinocytes to grow nicely into multilayers. Collagen (mainly collagen type I) is often used as a scaffold because it is biocompatible, non-immunogenic and available. However, collagen biodegrades relatively rapidly and is not good at withstanding mechanical forces. Improved characteristics can be created by cross-linking collagen-based matrices: this is an effective method to correct the instability and mechanical properties.
Sources: en.wikipedia.org
It is a short synthetic peptide built from seven amino acids: methionine, glutamic acid, histidine, phenylalanine and three prolines. The sequence derives from the 4-10 fragment of adrenocorticotropic hormone with an added proline-glycine-proline tail. No plant or animal extract is involved; the material is produced by solid-phase peptide synthesis.
It was developed in the Soviet Union during the early 1980s by groups at the Institute of Molecular Genetics in Moscow. Russian approval for intranasal use followed, and it has been marketed there since. Western laboratories encountered it mainly through translated literature and, later, through online research-chemical trade.
It holds a Russian registration as a prescription nasal product but has no approval from the European Medicines Agency or the United States Food and Drug Administration. Buyers outside Russia usually receive material sold strictly for laboratory research. That distinction matters because research-grade and pharmaceutical-grade products carry different documentation and testing expectations.
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.