A practical reference on N-acetyl Semax: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-11-07. Anything still debated is marked as such rather than presented as settled.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
Clinical evidence consists largely of small trials with modest sample sizes, often without independent replication. Reported endpoints include cognitive scores, recovery after stroke, and visual function, but study designs vary widely and few trials meet contemporary reporting standards. Systematic reviewers have noted a high risk of bias in several of these reports. No large multicenter trial conducted outside Russia has been published. The compound is therefore best described as investigational in most jurisdictions, with its clinical role still unresolved.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its chain combines the first seven residues of corticotropin with a C-terminal proline-glycine-proline extension, a modification intended to slow enzymatic breakdown. The free peptide has a molecular mass near 813.9 daltons. It belongs to the class of ACTH-derived fragments studied for central nervous system activity rather than for adrenal steroid stimulation. This structural relationship to a natural hormone fragment is the usual starting point for describing the compound in the literature.
| Property | Value | Notes |
|---|---|---|
| Appearance | White lyophilized powder | Typical for synthetic peptides |
| Solubility | Freely soluble in water | Also soluble in saline |
| Storage temperature | -20 C or below | Protect from repeated freeze-thaw |
| Analytical method | Reverse-phase HPLC | Confirms purity and identity |
| Common synonym | ACTH(4-10) analog | Reflects structural origin |
从分子层面看，Semax 是线性七肽，没有二硫键、糖基或脂链修饰，N 端为游离氨基，C 端为游离羧基。分子含组氨酸与谷氨酸侧链，因此在水和甲醇等极性溶剂中溶解良好，在非极性溶剂中溶解有限。计算分子量约为 814 Da，与其质子化离子的质荷比吻合，可用于质谱确认。
稳定性主要由水解与氧化两条路径支配。肽键在中性或弱酸性条件下相对稳定，遇到强碱或长时间高温则明显断裂；甲硫氨酸侧链容易被氧化成亚砜，使主峰前移并拉低实际含量。金属离子、光照和反复冻融会进一步促进降解或聚集。冻干粉在低温避光条件下可存放较长时间，配制后的水溶液通常需要冷藏并尽快用完。
The compound was developed during the 1980s at the Institute of Molecular Genetics in Moscow as part of research on fragments of adrenocorticotropic hormone. Early work examined short ACTH-derived sequences that retained neurotrophic effects while lacking the endocrine activity of the full hormone. Semax entered clinical use in Russia during the 1990s, where it received registration for several neurological indications. Outside that region it remained primarily a laboratory research material rather than an approved therapeutic. English-language literature on it grew more slowly and frequently cited the original Russian studies.
Terminology around the compound varies by source. It appears in catalogues and papers as Semax, as the heptapeptide ACTH(4-7)-Pro-Gly-Pro, and under various alphanumeric laboratory codes used by individual suppliers. These names refer to the same sequence but may imply different salt forms, purity grades, or counter-ions. Peptide databases usually list the free base mass, while product descriptions sometimes report acetate or trifluoroacetate salts with a different formula weight. Because naming conventions for research peptides are not standardised across vendors, checking the declared sequence and measured mass is more reliable than relying on a trade name alone.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its design combines the ACTH(4-7) core fragment with a C-terminal Pro-Gly-Pro extension, a modification intended to improve stability and prolong activity. The molecule is hydrophilic, carries no lipid chains or glycosylation, and has a theoretical mass just over 810 daltons in its free form. All seven residues are proteinogenic amino acids, so no non-natural building blocks appear in the backbone. A free N-terminal methionine and C-terminal proline define the unmodified parent peptide.
多数实验室与市售的 Semax 以冻干粉形式提供。冻干粉通常建议保存在 -20 °C 或更低温度下，同时避免光照与反复升温。短期运输有时采用冷藏条件，但长期保存仍以冷冻为主。分包操作应尽量减少开盖次数，以降低吸湿和微生物污染的风险。开封后若未一次用完，建议在干燥环境中密封并尽快放回低温储存。
溶液状态的稳定性明显低于冻干粉。肽类在水溶液中可能经历水解、氧化与聚集，其中甲硫氨酸和天冬酰胺等残基常是敏感位点。Semax 含有甲硫氨酸，因此氧化风险相对突出。工作液一般主张现配现用，或冷藏并在数日内用尽。缓冲液种类、pH 和离子强度都会影响降解速率，而关于最佳条件的公开数据并不统一。
常规纯度与身份确认依赖反相高效液相色谱，并辅以质谱测定分子量。氨基酸组成分析可用于验证序列构成，肽图分析则能进一步定位修饰或降解产物。杂质谱通常关注缺失序列肽、截短片段和氧化产物。不同方法的检出限并不相同，因此各实验室报告的纯度数值不宜直接横向比较。
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.
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.
=== Diet === Changes in diet may help prevent the development of atherosclerosis. Tentative evidence suggests that a diet containing dairy products has no effect on or decreases the risk of cardiovascular disease. A diet rich in fruits and vegetables lowers the risk of cardiovascular disease and death. Evidence suggests that the Mediterranean diet may improve cardiovascular results. There is also evidence that a Mediterranean diet may be better than a low-fat diet in bringing about long-term changes to cardiovascular risk factors (e.g., lower cholesterol level and blood pressure). A 2024 review highlighted that bioactive compounds found in Mediterranean diet components (such as olive, grape, garlic, rosemary, and saffron) exhibit properties that may contribute to cardiovascular health and atherosclerosis prevention.
=== EDTA-dependent agglutination === In some individuals, clinically insignificant antibodies may cause in vitro agglutination of platelets. As a result of platelet clumping, platelet counts reported by automated counters may be much lower than the actual count in the blood because these devices cannot differentiate platelet clumps from individual cells. Pseudothrombocytopenia has been reported in association with the use of EDTA as an anticoagulant, with platelet cold agglutinins, and with multiple myeloma. Other risk factors associated with pseudothrombocytopenia are autoimmune diseases, infections, pregnancy and the treatment with some medications such as low-molecular-weight heparin, valproic acid, insulin, antibiotics and chemotherapy medications like sunitinib. The prevalence of pseudothrombocytopenia in K2-EDTA reported in different studies ranges from 0.03 to 0.27 percent in outpatients, which accounts for 15 to 30 percent of all cases of isolated thrombocytopenia. Tests can mistake small clumps of platelets for leukocytes, thus showing a pseudoleukocytosis in blood counts.
==== Clean vehicle and clean energy home improvement tax credits eliminated ==== The tax credit for buying a new qualified electric vehicle or fuel cell electric vehicle is no longer available for purchases made after September 30, 2025. The tax credit for buying a used qualified electric vehicle or fuel cell vehicle from a licensed dealer is no longer available for purchases made after September 30, 2025. The tax credit for installing property to either recharge electric vehicles or to store or dispense clean-burning fuel will no longer be available after June 30, 2026. The tax credit for making qualified energy-efficient improvements to one's home will no longer be available for improvements put into service after December 31, 2025. The tax credit for installing solar electric panels, solar water heaters, wind turbines, geothermal heat pumps, fuel cells, or battery storage technology in one's home will no longer be available for improvements made after December 31, 2025.
"Midsize" fashion gained greater exposure on TikTok after many creators opened up about not able to find clothing sizes that fit them well. Women's apparel can roughly be divided into petite, straight, and plus sizes, leaving gaps in between. Realistic videos about how differently pieces of garment fit on a model compared to how they fit on a typical consumer resonated with many who had believed that they were alone in their struggle.
Sources: en.wikipedia.org
English-language newspapers include The Moscow Times. Until its closure in 2014, The Moscow News was the oldest English-language weekly newspaper in Russia. Kommersant, Vedomosti, and Novaya Gazeta are Russian-language newspapers headquartered in Moscow. Kommersant and Vedomosti are among the country's oldest Russian-language business newspapers.
Lithium and sodium react with carbon to form acetylides, Li2C2 and Na2C2, which can also be obtained by reaction of the metal with acetylene. Potassium, rubidium, and caesium react with graphite; their atoms are intercalated between the hexagonal graphite layers, forming graphite intercalation compounds of formulae MC60 (dark grey, almost black), MC48 (dark grey, almost black), MC36 (blue), MC24 (steel blue), and MC8 (bronze) (M = K, Rb, or Cs). These compounds are over 200 times more electrically conductive than pure graphite, suggesting that the valence electron of the alkali metal is transferred to the graphite layers (e.g. M+C−8). Upon heating of KC8, the elimination of potassium atoms results in the conversion in sequence to KC24, KC36, KC48 and finally KC60. KC8 is a very strong reducing agent and is pyrophoric and explodes on contact with water. While the larger alkali metals (K, Rb, and Cs) initially form MC8, the smaller ones initially form MC6, and indeed they require reaction of the metals with graphite at high temperatures around 500 °C to form. Apart from this, the alkali metals are such strong reducing agents that they can even reduce buckminsterfullerene to produce solid fullerides MnC60; sodium, potassium, rubidium, and caesium can form fullerides where n = 2, 3, 4, or 6, and rubidium and caesium additionally can achieve n = 1.
=== Brazil === Absinthe was prohibited in Brazil until 1999 and was brought by entrepreneur Lalo Zanini and legalised in the same year. Presently, absinthe sold in Brazil must abide by the national law that restricts all spirits to a maximum of 54% ABV. While this regulation is enforced throughout channels of legal distribution, it may be possible to find absinthe containing alcohol in excess of the legal limit in some restaurants or food fairs.
Sources: en.wikipedia.org
===== Third and fourth generations ===== In the 1980s, the models of the third and of the fourth generations of breast implant devices were sequential advances in manufacturing technology, such as elastomer-coated shells that decreased gel-bleed (filler leakage), and a thicker (increased-cohesion) filler gel. Sociologically, the manufacturers of prosthetic breasts then designed and made anatomic models (natural breast) and shaped models (round, tapered) that realistically corresponded with the breast- and body- types of women. The tapered models of breast implant have a uniformly textured surface, which reduces the rotation of the prosthesis within the implant pocket; the round models of breast implant are available in smooth-surface- and textured-surface- types.
Barère voiced the Committee of Public Safety's support for the measures desired by the assembly: he presented a decree that was passed immediately, establishing a paid armed force of 6,000 men and 1,000 gunners "designed to crush the counter-revolutionaries, to execute wherever the need arises the revolutionary laws and the measures of public safety that are decreed by the National Convention, and to protect provisions (A force of citizen-soldiers which could go into the countryside to supervise the requisition of grain, to prevent the manoeuvres of rich égoistes and deliver them up to the vengeance of the laws)".) For that reason, twelve travelling tribunals (with moveable guillotines) were set up. Three months later, on 4 December, the departmental revolutionary armies (except in Paris) were banned on proposal of Tallien. The sections lost all rights to control their delegates and officials. On 4 March 1794, there were rumours of uprising in the Cordeliers club. The Hébertists hoped that the National Convention would expel Robespierre and his Montagnard supporters. The sans-culottes did not respond, and Hanriot refused to cooperate. On 13 March Hébert, the voice of the sans-culottes, had been using the latest issue of Le Père Duchesne to criticise Robespierre. On 18 March Bourdon attacked the Commune and the sans-culottes army. Jacques Hébert, Ronsin, Vincent, Momoro, Clootz, De Kock were arrested on charges of complicity with foreign powers (William Pitt the Younger) and guillotined on 24 March.
Carbohydrates – ranging from monosaccharides to polysaccharides and including blood group antigens, hyaluronic acid oligomers and sialic acid residues Peptide/protein – ranging from single amino acids to proteins as large as antibodies Labels – including fluorophores, radioisotopes, biotin, etc. Other – chemical moieties such as maleimide, click residues, PEG, charged compounds Note 1: Multimeric – the presentation of the F residue can be as multimers with controlled spacing and be variable. Note 2: Mass – the mass that can be anchored by an FSL Kode constructs can range from 200 to >1 million Da
He saw that Britain's future lay in being part of the European Economic Community, and he established ties with the European Organization for Nuclear Research (CERN), the European Molecular Biology Organization (EMBO) and the European Space Research Organization (ESRO). In 1959, the Royal Society provided for only one research fellowship, the Foulerton Professorship, but in 1961, at his suggestion, the Henry Dale Research Professorship was created for a researcher in physiology and pharmacology. Government funding was provided to create three more professorships in 1964, and another two in 1967. Reflecting his attempt to move with the times, a chair was established for the social sciences, and two new lecture series were instituted, for technology and the behavioural sciences. Aware of the acute danger of overpopulation that the life-saving drugs that he had pioneered could cause, he established a population study group, and in 1967, he became the president of the Family Planning Association.
Sources: en.wikipedia.org
It is associated with the melanocortin receptor family, particularly subtypes found in the central nervous system. This interaction is separate from the adrenal pathway activated by full-length ACTH.
Peptidases degrade the compound within minutes in circulation. This short half-life is one reason nasal delivery is used, placing the substance close to the olfactory and trigeminal pathways.
No large multicenter trials have been published in English-language journals. The existing human evidence consists mainly of smaller studies conducted in Russia, which limits generalization.
Semax is a synthetic seven-amino-acid peptide derived from a fragment of corticotropin. It is used in Russia as a nasal preparation, while elsewhere it is studied as a research compound. It is not approved as a medicine in most countries.