nasal formulation 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.
Last reviewed on 2025-09-06. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Seven-residue peptide |
| Molecular mass | 813.9 Da | Monoisotopic value |
| Appearance | White to off-white powder | Lyophilized form |
| Solubility | Freely soluble in water | Also soluble in saline and polar solvents |
| Storage (dry) | -20 °C or lower | Desiccated, protected from light |
Laboratory work points toward modulation of neurotrophic signaling, particularly expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal tissue. Studies also describe effects on monoamine turnover, inflammatory mediators, and oxidative markers. These observations come mainly from animal models and cultured cells, so the causal chain in humans is not firmly established. Whether the reported molecular changes translate into measurable clinical benefit is an open question. Reviews generally present the mechanism as plausible rather than demonstrated.
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.
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.
=== Membership policy === WOSM's membership consists of its remaining founding member organizations and organizations recognized by WOSM as national scout organizations. WOSM's rules protect its founding and existing member organizations by permitting only one member organization in each country and locking-out all other Scout organizations from WOSM membership, recognition and participation no matter how worthy or large their membership. Several member organizations are federations, some with different component groups divided on the basis of religion (e.g., France and Denmark), ethnic identification (e.g., Israel) or language (e.g., Belgium). However, WOSM has never required an existing member organization to federate with other Scout organizations in the country, in order to make WOSM more inclusive and representative. There are numerous Canadian Scout organizations but only one is a WOSM member organization (the Canadian branch of one of the organizations that founded WOSM) which has a French language affiliate which is thereby recognized by WOSM. Other than this inherent limitation on WOSM membership, the basis for WOSM membership includes adherence to WOSM's aims and principles and independence from political involvement on the part of each member organization.
The activity of GSK-3 is far greater in the nucleus and mitochondria than in the cytosol in cortical neurons, while the phosphorylation of Beta-catenin by GSK-3 is mediated by the binding of both proteins to Axin, a scaffold protein, allowing Beta-catenin to access the active site of GSK-3. Insulin indirectly inactivates GSK3 via downstream phosphorylation of the specific serine residues Ser21 and Ser9 in GSK-3 isoforms α and β, respectively, via the PI3K/Akt pathway (protein kinase B).
BmKAEP (or anti-epilepsy peptide) is a neurotoxin from the venom of the Manchurian scorpion (Mesobuthus martensii). It is a β-toxin, which shift the activation voltage of sodium channels towards more negative potentials.
Plastic surgery can be performed to augment or reduce the size of breasts, or to reconstruct the breast in cases of deformative disease, such as breast cancer. Breast augmentation and breast lift (mastopexy) procedures are done only for cosmetic reasons, whereas breast reduction is sometimes medically indicated. In cases where a woman's breasts are severely asymmetrical, surgery can be performed to either enlarge the smaller breast, reduce the size of the larger breast, or both. Breast augmentation surgery generally does not interfere with future ability to breastfeed. Breast reduction surgery more frequently leads to decreased sensation in the nipple-areola complex, and to low milk supply in women who choose to breastfeed. Implants can interfere with mammography (breast x-ray images).
Sources: en.wikipedia.org
These were a mixture of formed units and individuals. In Tony Blair's Strategic Defence Review of 1998, the TA's size was reduced to 41,200. In 2003, 9,500 reservists were mobilised to take part in Operation TELIC, the invasion of Iraq. Reservists were deployed in a mixture of formed bodies and as individuals. For example, a formed sub-unit from 131 Commando Squadron Royal Engineers opened up a beach landing point on the Al Faw Peninsula and then two further crossing points on sequential watercourses for tanks in the attack on Basra. The Royal Yeomanry mobilised Regimental Headquarters (RHQ) and two sub-units to deliver the UK's Chemical, Radiological, Biological, and Nuclear counter-measures for Operation TELIC. At the peak in 2004, reservists made up 20% of Britain's strength in Iraq. In Afghanistan too, large numbers of reservists deployed in a mixture of formed units and as individuals, until 2009 when the decision was taken to allow only individuals to deploy as reinforcements for regular units. One example of a formed body was Somme Company of The London regiment of whom Brigadier (later Lieutenant-General Sir) John Lorimer remarked: "Somme Company was an outstanding body of men: well trained, highly motivated and exceptionally well led." Approximately 1,200 members of the Army Reserve deployed annually on tours of duty in Iraq, Operation HERRICK in Afghanistan and elsewhere, normally on six-month-long roulements.
=== Efficacy === As of 2007 there were not enough good-quality trials of herbal therapies to allow their effectiveness to be determined. A high percentage of relevant studies on traditional Chinese medicine are in Chinese databases. Fifty percent of systematic reviews on TCM did not search Chinese databases, which could lead to a bias in the results. Many systematic reviews of TCM interventions published in Chinese journals are incomplete, some contained errors or were misleading. The herbs recommended by traditional Chinese practitioners in the US are unregulated.
Subjects in Byzantine art were primarily Christian and typically non-naturalistic in their representation. Emerging from both the earliest Christian and Late Antique art, many early examples were lost amid the Roman Persecutions; the fragmented mosaics of the 3rd-century Dura-Europos church are a unique exception. Such Byzantine mosaics, known for their gold ground style, became a hallmark of the empire, displaying both secular and sacred themes in diverse places, including churches (Basilica of San Vitale), the circus (Hippodrome of Constantinople), and the Great Palace of Constantinople. The early 6th-century reign of Justinian I saw systemic developments: religious art came to dominate, and once-popular public marble and bronze monumental sculpture fell out of favour due to pagan associations. Justinian commissioned the monumental Hagia Sophia church, and its influential elements became architectural hallmarks for the empire: the immense size, large dome, innovative use of pendentives and highly decorative interior were imitated as far north as the Cathedral of Saint Sophia in Novgorod and the Saint Sophia Cathedral in Kiev. The Hagia Sophia's creators, the engineer-architects Isidore of Miletus and Anthemius of Tralles, are uniquely esteemed; most Byzantine artists were unrecorded and typically deemed to have little importance.
Adiponectin (also referred to as GBP-28, apM1, AdipoQ and Acrp30) is a protein hormone and adipokine, which is involved in regulating glucose levels and fatty acid breakdown. In humans, it is encoded by the ADIPOQ gene and is produced primarily in adipose tissue, but also in muscle and even in the brain.
High fentanyl doses Simultaneous use of methadone Sleep Older age Simultaneous use of CNS depressants like benzodiazepines (i.e. alprazolam, diazepam, clonazepam), barbiturates, alcohol, and inhaled anesthetics Hyperventilation Decreased CO2 levels in the serum Respiratory acidosis Decreased fentanyl clearance from the body Decreased blood flow to the liver Renal insufficiency Sustained release fentanyl preparations, such as patches, may also produce unexpected delayed respiratory depression. The precise reason for sudden respiratory depression is unclear, but there are several hypotheses:
Sources: en.wikipedia.org
=== Arts, sciences, and education === John DeCuir, 1936: art director and production designer Robert Bruce Merrifield, 1939: biochemist who won the Nobel Prize in Chemistry in 1984 for the invention of solid phase Peptide synthesis
Matrix metalloproteinases (MMPs), also known as matrix metallopeptidases or matrixins, are metalloproteinases that are calcium-dependent zinc-containing endopeptidases; other family members are adamalysins, serralysins, and astacins. The MMPs belong to a larger family of proteases known as the metzincin superfamily. Collectively, these enzymes are capable of degrading all kinds of extracellular matrix proteins, but also can process a number of bioactive molecules. They are known to be involved in the cleavage of cell surface receptors, the release of apoptotic ligands (such as the FAS ligand), and chemokine/cytokine inactivation. MMPs are also thought to play a major role in cell behaviors such as cell proliferation, migration (adhesion/dispersion), differentiation, angiogenesis, apoptosis, and host defense. They were first described in vertebrates in 1962, including humans, but have since been found in invertebrates and plants. They are distinguished from other endopeptidases by their dependence on metal ions as cofactors, their ability to degrade extracellular matrix, and their specific evolutionary DNA sequence.
== Side effects == Common and mild side effects of nefazodone reported in clinical trials more often than placebo include dry mouth (25%), sleepiness (25%), nausea (22%), dizziness (17%), blurred vision (16%), weakness (11%), lightheadedness (10%), confusion (7%), and orthostatic hypotension (5%). Rare and serious adverse reactions may include allergic reactions, fainting, painful/prolonged erection, and jaundice. Nefazodone is not especially associated with increased appetite and weight gain. It is also known for having low levels of sexual side effects in comparisons to SSRIs. Nefazodone can cause severe liver damage which may lead to the need for liver transplantation or to death. The incidence of severe liver damage is approximately 1 in every 250,000 to 300,000 patient-years. By the time it started to be withdrawn from the markets in 2003, nefazodone had been associated with at least 53 cases of liver injury (of which 11 led to death) in the United States, and 51 cases of liver toxicity (of which 2 led to transplantation) in Canada. In a 2002 Canadian study of 32 cases, it was noted that databases like those used in the study tended to include only a small proportion of suspected drug reactions. Treatment protocols suggest screening for pre-existing liver disease before initiating nefazodone, and those with known liver disease should not be prescribed nefazodone. If serum AST or serum ALT levels are more than 3 times the upper limit of normal (ULN), treatment should be permanently withdrawn.
== Further reading == Scanga R, Scalise M, Marino N, Parisi F, Barca D, Galluccio M, et al. (October 2023). "LAT1 (SLC7A5) catalyzes copper(histidinate) transport switching from antiport to uniport mechanism". iScience. 26 (10) 107738. Bibcode:2023iSci...26j7738S. doi:10.1016/j.isci.2023.107738. PMC 10492218. PMID 37692288.
Sources: en.wikipedia.org
It is a synthetic peptide of seven amino acids. Its backbone corresponds to a fragment of adrenocorticotropic hormone extended at the carboxyl end. The material is distributed as a lyophilized solid for laboratory use.
The extension was introduced to slow enzymatic breakdown of the peptide in biological systems. Natural ACTH fragments are degraded rapidly by peptidases. Adding the tripeptide was intended to extend the window during which the molecule remains intact.
Most published work consists of animal experiments conducted in a small number of laboratories. Human data are limited in number and size. Whether the observed effects translate into reliable clinical benefit is still unresolved.
It is registered as a pharmaceutical product in Russia, where it is typically supplied as a nasal solution. In most other countries it is not an approved drug and is traded as a research chemical instead. Approval status depends entirely on the jurisdiction involved.