Heptapeptide is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-05-28. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
| 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 |
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.
Reported pharmacological work centers on neurotrophic signaling, including changes in BDNF and NGF expression in hippocampal tissue in animal models. Human data come largely from studies conducted in Russia, and how well those results generalize to other populations remains an open question. Regulatory status differs sharply by jurisdiction: Semax is a registered prescription medicine in Russia, while it holds no approved marketing status in the United States or the European Union. Outside such jurisdictions it is generally handled as a research chemical, which affects both documentation and quality expectations.
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.
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.
=== 1970s: Heseltine takes ownership of Haymarket === In 1970, Heseltine turned down the chance to invest £25,000 in the advertising agency Saatchi & Saatchi when it was set up (his former employee Maurice Saatchi said that he had learned a great deal from Heseltine's aggressive techniques of acquiring magazine titles, and from publicity in Campaign magazine), believing wrongly that it was against the code for ministers to make such an investment. Lindsay Masters did invest, but was eventually bought out by the Saatchi brothers; Heseltine later believed that he and Masters together could have made another fortune if they had reinforced one another with large shareholdings in Saatchi and Saatchi. With Heseltine a government minister from June 1970, Haymarket was being run by Masters and Tindall, who had secured another coup by publishing Computing for the British Computing Society. BPC was in financial trouble in 1971, and Heseltine, Masters and Tindall assembled a consortium of County Bank, Charterhouse Development, ICFC and Wren Investments to help buy out BPC's 60% stake for £1m, a very low price given that Haymarket had made over £250,000 the previous year. The consortium took a 40% stake in Haymarket, and loaned the company £820,000, while Heseltine took out a large personal loan at this time to buy both another 20% of Haymarket's shares (the rest of the BPC shareholding, bringing Heseltine's own shareholding to just under 50%).
=== Ha–He === James Haber (b. 1943). American molecular biologist at Brandeis University known for his discoveries in the field of DNA repair. Member Natl. Acad. Sci. USA. J. B. S. Haldane (John Burdon Sanderson Haldane, 1892–1964). British (and later Indian) geneticist, biochemist (study of enzymes) and statistician, at University College London and at the end of his life at the Indian Statistical Institute. Apart from his contributions to science, he was notable for political activism and wrote many articles for the Daily Worker. Gordon Hammes (b. 1934). American biochemist at Cornell and Duke University, noted for work on enzyme mechanisms and kinetics. Member Natl. Acad. Sci. USA. Philip Handler (1917–1981). American nutritionist and biochemist, noted for the understanding of nicotinic acid deficiency and the discovery of the tryptophan-nicotinic acid relationship. He was at Duke University until he became President of the Natl. Acad. Sci. USA Jean Hanson (1919–1973). British biophysicist and zoologist at Massachusetts Institute of Technology known for her contributions to muscle research. Arthur Harden FRS (1865–1940). British biochemist at the Lister Institute, known for work on the fermentation of sugar and fermentative enzymes. Nobel Prize in Chemistry (1929). Grahame Hardie FRS (b. 1950), British biochemist at the University of Dundee, known for work on AMP-activated protein kinase. Harry Harris FRS, FCRP (1919–1994), British-born biochemist who showed that human genetic variation was not rare. Edwin B.
In November 2024, the European Commission expanded the indication of ribociclib, in combination with an aromatase inhibitor, for the adjuvant treatment of adults with hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2)-negative early breast cancer at high risk of recurrence.
===== Lipid nanoparticles ===== Lipid nanoparticles (LNPs) are based on liposome-like structures that are typically made of an aqueous center surrounded by a lipid shell. A subset of liposomal structures used for delivery drugs to tissues rest in large unilamellar vesicles (LUVs) which may be 100 nm in size. LNP delivery mechanisms have become an increasing source of encasing nucleic acids and may include plasmids, CRISPR and mRNA. The first approved use of lipid nanoparticles as a drug delivery mechanism began in 2018 with the siRNA drug patisiran, developed by Alnylam Pharmaceuticals. Dicerna Pharmaceuticals, Persomics, Sanofi and Sirna Therapeutics also worked to bring RNAi therapies to market. Other recent applications include two FDA approved COVID-19 vaccines: mRNA-1273, developed by Moderna. and BNT162b, developed by a collaboration between Pfizer and BioNtech. These two vaccines use lipid nanoparticles to deliver antigen mRNA. Encapsulating the mRNA molecule in lipid nanoparticles was a critical breakthrough for producing viable mRNA vaccines, solving a number of key technical barriers in delivering the mRNA molecule into the host cell as distributed through apolipoprotein E (apoE) in the low-density lipoprotein receptor (LDLR). In December 2020, Novartis announced that positive results from phase III efficacy studies deemed inclisiran was a treatment for heterozygous familial hypercholesterolemia (HeFH) and atherosclerotic cardiovascular disease (ASCVD).
Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads: the ovaries in a female, the testicles in a male. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle, blood, skin, hair, breasts, and sex organs. Physical growth—height and weight—accelerates in the first half of puberty and is completed when an adult body has been developed. Before puberty, the external sex organs, known as primary sexual characteristics, are sex characteristics that distinguish males and females. Puberty leads to sexual dimorphism through the development of the secondary sex characteristics, which further distinguish the sexes. On average, females begin puberty at age 10½ and complete puberty at ages 15–17; males begin at ages 11½–12 and complete puberty at ages 16–17. The major landmark of puberty for females is menarche, the onset of menstruation, which occurs on average around age 12½. For males, first ejaculation, spermarche, occurs on average at age 13. In the 21st century, the average age at which children, especially females, reach specific markers of puberty is lower compared to the 19th century, when it was 15 for females and 17 for males (with age at first periods for females and voice-breaks for males being used as examples).
Sources: en.wikipedia.org
It was a pragmatic system based on the primacy of the strong – a "trusteeship of the powerful", as he then called it, or, as he put it later, "the Four Policemen". The concept was, as [Senator Arthur H.] Vandenberg noted in his diary in April 1944, "anything but a wild-eyed internationalist dream of a world state. ... It is based virtually on a four-power alliance." Eventually this proved to be both the potential strength and the actual weakness of the future UN, an organization theoretically based on a concert of great powers whose own mutual hostility, as it turned out, was itself the greatest potential threat to world peace.
As nitrous oxide in its extensive operation appears capable of destroying physical pain, it may probably be used with advantage during surgical operations in which no great effusion of blood takes place.
Triple-stranded DNA has been observed in supercoiled Satellite DNA in regions where microsatellite copy numbers are highly variable, along with inverted-repeat Z-DNA structures within a larger 2.1kb satellite DNA repeat unit.
Nandrolone is an agonist of the AR, the biological target of androgens like testosterone and DHTTooltip dihydrotestosterone. Unlike testosterone and certain other anabolic steroids, nandrolone is not potentiated in androgenic tissues like the scalp, skin, and prostate, hence deleterious effects in these tissues are lessened. This is because nandrolone is metabolized by 5α-reductase to the much weaker AR ligand 5α-dihydronandrolone (DHN), which has both reduced affinity for the androgen receptor (AR) relative to nandrolone in vitro and weaker AR agonistic potency in vivo. The lack of alkylation on the 17α-carbon drastically reduces the hepatotoxic potential of nandrolone. Estrogen effects resulting from reaction with aromatase are also reduced due to lessened enzyme interaction, but effects such as gynecomastia and reduced libido may still occur at sufficiently high doses. In addition to its AR agonistic activity, unlike many other anabolic steroids, nandrolone is also a potent progestogen. It binds to the progesterone receptor with approximately 22% of the affinity of progesterone. The progestogenic activity of nandrolone serves to augment its antigonadotropic effects, as antigonadotropic action is a known property of progestogens.
Sources: en.wikipedia.org
=== Consumer products === Cadmium is used in nickel-cadmium batteries; these are some of the most popular and most common cadmium-based products. In May 2006, a sale of the seats from Arsenal F.C.'s old stadium, Highbury in London, England was cancelled when the seats were discovered to contain trace amounts of cadmium. In February 2010, cadmium was found in an entire line of Wal-Mart exclusive Miley Cyrus jewelry. The charms were tested at the behest of the Associated Press and were found to contain high levels of cadmium. Wal-Mart did not stop selling the jewelry until May 12 because "it would be too difficult to test products already on its shelves". On June 4, 2010, cadmium was detected in the paint used on promotional drinking glasses for the movie Shrek Forever After, sold by McDonald's Restaurants, triggering a recall of 12 million glasses.
From 2011, new cars should have brake assist system in the EU, according to The Pedestrian Protection Regulation (EC) 78/2009. Starting in 2012, all cars under 10,000 lbs. sold in the US are required to have Electronic Stability Control. In 2014, ESP (Electronic Stability Program) and TPMS became mandatory in the European Union, with also the driver seat belt reminder and the ISOFIX system, under General Safety Regulation (EC) No 661/2009. In 2015, recognizing that safer roads are a shared responsibility, Together for Safer Roads (TSR) was formally launched to align the private sector's road safety efforts with the United Nations Decade of Action for Road Safety. In 2016 and 2017, ABS became mandatory on motorcycles in the EU. In 2018, eCall became mandatory in the EU, and reverse camera in the US. In 2019, the EU legislated to revise the General Safety Regulation (GSR), the revision includes the following automotive safety features:
{\displaystyle {\ce {^{99}_{39}Y ->[\beta^-][1.47\,{\ce {s}}] ^{99}_{40}Zr ->[\beta^-][2.1\,{\ce {s}}] ^{99}_{41}Nb ->[\beta^-][15.0\,{\ce {s}}] ^{99}_{42}Mo ->[\beta^-][65.94\,{\ce {h}}] ^{99}_{43}Tc ->[\beta^-][211,100\,{\ce {y}}] ^{99}_{44}Ru}}}
== See also == κ-Opioid receptor § Antagonists List of investigational antidepressants List of investigational bipolar disorder drugs List of investigational substance-related disorder drugs Aticaprant and navacaprant
Evidence from the study of carbon and oxygen isotope composition of tooth enamel of equids, bovids and hippopotamids from Melka Wakena and Gadeb, interpreted as indicative of presence of montane grasslands with shrubs and aquatic habitats in Ethiopian highlands that provided recurrent access to water and vegetation to mammals (including Acheulean-making hominins) in the late Early Pleistocene, is presented by Briatico et al. (2026). Evidence from the study of the composition of Middle and Late Pleistocene small mammalian assemblages from the East European Plain, interpreted as consistent with presence of semi-arid and arid steppe habitats during the warmest and driest phases of the Pleistocene interglacials, is presented Markova, Puzachenko & Tsatskin (2026). Robu et al. (2026) reconstruct trophic relationships of Late Pleistocene mammals from cave sites in the Romanian Carpathians with and without bears on the basis of an isotopic analysis of their bones, reporting evidence of overall similar dietary behavior of the studied mammals throughout Europe during Marine Isotope Stage 3, as well as evidence of mainly herbivorous diet of cave bears that included varying levels of animal protein consumption, and interpret the dietary behavior of the studied cave bears as possibly influenced by abundance of the carnivores. Russo et al. (2026) study the composition of Pleistocene faunal assemblages from the Naame, Nahr Ibrahim and Ras el-Kelb sites (Lebanon) and tooth wear of ungulates from these sites, while Russo et al.
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 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.