If you have been reading about Intranasal route and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2025-09-07. Numbers and descriptions here follow the published literature rather than marketing material.
Published clinical evidence is limited. Most controlled trials were conducted in Russia, enrolled modest numbers of participants, and appeared in Russian-language journals, which restricts independent verification. Reported outcomes include lower anxiety scores, improved attention and memory measures, and changes in fatigue ratings. Reviews written in English note methodological limitations such as small samples and inconsistent endpoints. Whether the compound produces clinically meaningful benefit relative to established anxiolytics is therefore an open question rather than an established finding.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences as a structural analogue of tuftsin, a naturally occurring tetrapeptide fragment of the immunoglobulin heavy chain. The added Pro-Gly-Pro tail was intended to slow enzymatic degradation and extend biological activity. In Russia it is registered as an anxiolytic nasal preparation, while regulators elsewhere have not approved it for clinical use.
Most published work on selank originates from a small number of research groups in the Russian Federation. A large share of that record appears in Russian-language journals, which limits access for readers who rely on English-indexed databases. Independent replication by laboratories outside the original research network is sparse in publicly available sources. This concentration of origin and language is a frequently noted feature when the compound is summarized in broader reviews of synthetic peptides.
Reported pharmacological effects center on reduced anxiety-like behavior in animal models and on measures of memory and learning. Proposed contributing mechanisms include modulation of GABAergic signaling, shifts in monoamine turnover, and changes in the activity of enzymes that degrade neuropeptides. Effects on the expression of genes linked to neuroplasticity have also been described. No single molecular target is widely accepted, and whether the behavioral findings arise from one pathway or several remains an open question.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C33H57N11O9 | Free peptide form |
| Molecular mass | About 751.9 Da | Calculated average mass |
| Amino acid sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Single-letter form TKPRPGP |
| Structural basis | Tuftsin analogue | Extended version of a natural tetrapeptide |
| Development origin | Russian Academy of Sciences | Work carried out from the 1980s onward |
Regulatory status differs sharply by region. Selank holds a Russian marketing authorization, where it is supplied mainly as nasal drops, while authorities elsewhere have not approved it for medical use. Material sold internationally is therefore usually labeled as a research chemical rather than a medicine. Peer-reviewed publications come predominantly from Russian laboratories, and sample sizes are generally small. Whether the compound produces comparable effects under independent, well-controlled replication remains an open question that the broader literature has not settled.
Selank is a synthetic heptapeptide developed in Russia as a structural analogue of tuftsin, a naturally occurring immunomodulatory tetrapeptide. Its sequence, Thr-Lys-Pro-Arg-Pro-Gly-Pro, keeps the tuftsin core at the N-terminus and appends a Pro-Gly-Pro tail. Researchers at the Institute of Molecular Genetics in Moscow synthesized the compound during the 1990s while searching for peptides with combined anxiolytic and immunomodulatory activity. The added tail was intended to resist enzymatic cleavage and prolong the molecule's presence in circulation.
Pharmacokinetic data are limited. Like most short peptides, Selank is vulnerable to plasma and tissue peptidases, and its measured half-life in circulation is short, on a minutes scale. The Pro-Gly-Pro tail slows this degradation but does not eliminate it. Intranasal administration is the route described in most reports, with absorption through the nasal mucosa and a hypothesized path into the central nervous system that avoids the blood-brain barrier. Direct measurements of human brain exposure are unavailable, so distribution claims rest on inference from animal work.
Clinical evidence comes mainly from small studies conducted in Russia, several of which were open-label or lacked robust blinding. Reported outcomes include lower anxiety scores, changes in attention measures, and effects on asthenic states following illness. Sample sizes are typically in the tens of participants, and independent replication outside the region is scarce. Reviews published in English generally note the limited methodological quality of the underlying trials. Whether the compound produces clinically meaningful effects under rigorous conditions remains unresolved.
Selank is a synthetic heptapeptide developed in Russia. Its sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro, a seven-residue chain built around the natural tetrapeptide tuftsin. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences first described the compound in the mid-1990s. The design combined the tuftsin core with an added Pro-Gly-Pro tail, a modification intended to extend the molecule's stability in biological fluids. Published work on the peptide has appeared mainly in Russian-language journals.
Reported activity for Selank centers on anxiolytic and nootropic effects. Russian clinical reports describe use in anxiety and in cognitive or attention-related complaints. Most of this evidence comes from studies conducted by the same research groups that developed the peptide. Independent replication in other countries remains limited, and no major Western regulatory agency has approved the compound for any indication. The gap between local reports and external verification is a recurring point in discussions of the peptide.
Selank is a hydrophilic peptide and dissolves readily in water and in aqueous buffers. The lyophilised powder is typically a white to off-white solid. Because short peptides are prone to hydrolysis and oxidation, handling benefits from limiting exposure to heat, moisture and strong light. Working solutions are commonly prepared in sterile water or saline, and repeated freeze-thaw cycles are avoided to reduce aggregation and loss of activity. These practices reflect general laboratory convention rather than published stability specifications.
Dry powder is normally held at -20 degrees Celsius or lower, in a sealed container with desiccant and protection from light. Reconstituted solutions are usually kept at 2 to 8 degrees Celsius for short periods and frozen for longer ones. Proline residues at several positions are generally associated with some resistance to peptidase attack, but chemical stability still declines at neutral to alkaline pH and at elevated temperature. Exact shelf-life figures are product-specific and are not standardised across suppliers.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, with mass spectrometry used to confirm molecular mass and sequence information. Amino acid analysis and peptide mapping may supplement these methods. Certified reference standards are scarce, and many commercial lots are sold as research chemicals without a pharmacopoeial monograph. Regulatory treatment differs by country: Selank is a registered prescription medicine in Russia, while in the European Union and the United States it is not an approved drug and may fall under research-chemical or unapproved-product frameworks.
On June 26, 2025, Pritzker announced he would seek a third term as governor. With incumbent Lieutenant Governor Juliana Stratton running for U.S. Senate, Pritzker chose former state representative Christian Mitchell as his running mate. Pritzker and Mitchell ran unopposed in the March Democratic primary, winning 100% of the vote. Pritzker faces the Republican nominee, former state senator Darren Bailey, in a rematch in the November general election. Should Pritzker win, he will be first Illinois governor to win a third term since Jim Thompson in 1986, and the first Democrat to do so in Illinois history.
=== Hormonal factors === Sex hormones seem to influence humoral and cell-mediated immune response, with estrogen being considered one of the biggest factors responsible for sex-immunologic dimorphism. Estrogen deficiency appears to play a role in the development of Sjögren's disease. It has been hypothesized that androgen administration to the ocular surface may serve as an effective therapy for dry eyes.
The fact that the prostate was one and not two organs was an idea popularised throughout the early 18th century, as was the English language term used to describe the organ, prostate, attributed to William Cheselden. A monograph, "Practical observations on the treatment of the diseases of the prostate gland" by Everard Home in 1811, was important in the history of the prostate by describing and naming anatomical parts of the prostate, including the median lobe. The idea of the five lobes of the prostate was popularized following anatomical studies conducted by American urologist Oswald Lowsley in 1912. John E. McNeal first proposed the idea of "zones" in 1968; McNeal found that the relatively homogeneous cut surface of an adult prostate in no way resembled "lobes" and thus led to the description of "zones". Prostate cancer was first described in a speech to the Medical and Chiurgical Society of London in 1853 by surgeon John Adams and increasingly described by the late 19th century. Prostate cancer was initially considered a rare disease, probably because of shorter life expectancies and poorer detection methods in the 19th century. The first treatments of prostate cancer were surgeries to relieve urinary obstruction. Samuel David Gross has been credited with the first mention of a prostatectomy, as "too absurd to be seriously entertained" The first removal for prostate cancer (radical perineal prostatectomy) was first performed in 1904 by Hugh H. Young at Johns Hopkins Hospital; partial removal of the gland was conducted by Theodore Billroth in 1867.
==== Creatine ==== One of the most popular supplements is creatine. Although the body naturally produces creatine, it typically only produces enough to maintain around 60–80% of its full capacity. Creatine is most often found in red meats and seafood; however, a pound of uncooked beef and salmon only contains 1–2 grams of creatine. About 95% of creatine is stored in the skeletal muscle, while the remaining percentage is found in the brain and testes. Typical supplemental creatine doses are 3–5 grams per day. While taking creatine as a dietary supplement doesn't directly build muscle, it can lead to rapid energy production, increase improvement, enhance muscle recovery, prevent injuries, and provide neuroprotection. This is due to the fact that when creatine is paired with increased glycogen storage in the muscle, glycogen can quickly release glucose, providing an immense burst of energy. This burst of energy is helpful for professional bodybuilders, as anabolic steroids often cause fatigue and other health issues over time.
Sources: en.wikipedia.org
=== Metal binding === Metallothionein has been documented to bind a wide range of metals including cadmium, lead, zinc, mercury, copper, arsenic, silver, etc. Metalation of MT was previously reported to occur cooperatively but recent reports have provided strong evidence that metal-binding occurs via a sequential, noncooperative mechanism. The observation of partially metalated MT (that is, having some free metal binding capacity) suggest that these species are biologically important. Metallothioneins likely participate in the uptake, transport, and regulation of zinc in biological systems. Mammalian MT binds three Zn(II) ions in its beta domain and four in the alpha domain. Cysteine is a sulfur-containing amino acid, hence the name "-thionein". However, the participation of inorganic sulfide and chloride ions has been proposed for some MT forms. In some MTs, mostly bacterial, histidine participates in zinc binding. By binding and releasing zinc, metallothioneins (MTs) may regulate zinc levels within the body. Zinc, in turn, is a key element for the activation and binding of certain transcription factors through its participation in the zinc finger region of the protein. Metallothionein also carries zinc ions (signals) from one part of the cell to another. When zinc enters a cell, it can be picked up by thionein (which thus becomes "metallothionein") and carried to another part of the cell where it is released to another organelle or protein. In this way thionein and metallothionein becomes a key component of the zinc signaling system in cells.
The word "parsley" is a merger of Old English petersilie (which is identical to the contemporary German word for parsley: Petersilie) and the Old French peresil. Both of these names are derived from Medieval Latin petrosilium, from Latin petroselinum, which is the latinization of the Greek πετροσέλινον, petroselinon, 'rock-celery', from πέτρα, petra, 'rock, stone' and σέλινον, selinon, 'celery'. Mycenaean Greek se-ri-no, in Linear B, is the earliest attested form of the word selinon.
The IDF is planning a number of technological upgrades and structural reforms for the future. Training has been increased with greater cooperation between ground, air, and naval units. The Ground Forces are phasing out the M-16 rifle in favor of the IWI Tavor variants, most recently the IWI Tavor X95 flat-top ("Micro-Tavor Dor Gimel"). The outdated M113 armored personnel carriers are being replaced by the new Namer APCs, with 200 ordered in 2014, as well as obtaining the Eitan AFV, and upgrading the IDF Achzarit APCs. The backbone of the Artillery Corps, the M109 howitzer, will be phased out in favor of a still-undecided replacement, with the ATMOS 2000 and Artillery Gun Module under primary consideration. The IDF is planning a future tank to replace the Merkava, which will be able to fire lasers and electromagnetic pulses, run on a hybrid engine, with a crew as small as two, will be faster, and will be better-protected, with emphasis on active protection systems such as the Trophy over armor. The Combat Engineering Corps assimilated new technologies, mainly in tunnel detection and unmanned ground vehicles and military robots, such as remote-controlled IDF Caterpillar D9T "Panda" armored bulldozers, Sahar engineering scout robot and improved Remotec ANDROS robots.
The expected initial concentration of virus The product being purified The infective dose of the virus (for in vivo usage) Whether inactivation is a viable alternative to complete removal The capabilities of the laboratory The relative difficulty of the inactivation or removal method
=== Valve Corporation v. Zaiger, LLC === In 2023, Valve sued a law firm, Zaiger, alleging that it attempted to extort settlements from Valve by threatening to bring numerous antitrust arbitration cases on behalf of Steam customers, a tactic referred to as "mass arbitration". Valve also brought suit against a litigation financier for Zaiger over the funding of a social media campaign to recruit Steam users as clients. Valve alleged that it improperly interfered with its contracts with Steam customers and abused the arbitration process by signing up clients with the intent of obtaining settlements slightly lower than the cost of arbitration filing fees, rather than arbitrating their claims. Valve said that it was targeted due to the terms of the Steam Subscriber Agreement, in which Valve would be responsible for the fees and costs associated with arbitration. The lawsuit was dismissed without prejudice by the US District Court for the Western District of Washington in 2024 due to personal jurisdiction issues. In September 2024, Valve changed its Steam Subscriber Agreement to require disputes to proceed in court, specifically in King County, Washington, with no option of arbitration.
Sources: en.wikipedia.org
However, although the notion of obesity as a state of 'leptin resistance' has become ingrained in the minds of many researchers, data does not directly support this contention. For example, the work of Rudolph Leibel at Columbia University shows that, in both obese and lean individuals, leptin injections do not reduce body mass. The finding that both lean and obese subjects have a similar lack of response underscores the notion that the brain is not designed to respond to increased leptin by decreasing food intake; rather, lack of leptin acts as a signal to increase food intake. Indeed, Leibel's work has shown that the decreases in serum leptin that occur post-weight-loss constitute a state of leptin deficiency, which drives increased appetite with weight loss. As such, leptin injections in weight-reduced patients can prevent increases in appetite and thereby allow patients to maintain weight loss. These studies, therefore, demonstrate that leptin treatment may be a useful strategy to treat obesity in humans, if not by driving weight loss directly then by allowing weight loss (as a result of diet and exercise) to be more readily maintained. Moreover, as geneticists learn more from the few cases of leptin gene mutations, the possibility remains that, although leptin was ineffective at treating obesity across the population, some individual obese patients might still benefit from its use as an anti-obesity medication. Research into the adipose-derived hormones adiponectin and resistin is ongoing. Like leptin, these hormones also affect energy balance and metabolism.
== Early life and education == Born in 1910 in British India, Singh's formative years coincided with the imperial era's emphasis on disciplined resource control. He studied forestry in Edinburgh before returning to India, where he underwent probationary training at the Imperial Forest College in Dehradun. His specialized instruction emphasized practical skills, including silviculture, ecological assessment, timber valuation, and surveying techniques, grounding him in the principles of scientific forestry established by pioneers like Dietrich Brandis.
2 KNO3 + H2SO4 → 2 HNO3 + K2SO4 The residue was dissolved in hot water, filtered, and evaporated to a cuticle. It was then left to crystallise. It was used as a diuretic and sudorific. According to Chambers's Cyclopedia, the recipe was purchased for five hundred thalers by Charles Frederick, Duke of Holstein-Gottorp. Schroder, the duke's physician, wrote wonders of its great uses in hypochondriacal cases, continued and intermitting fevers, stone, scurvy, and more.
=== Match schedule === The match schedule, without group assignments, was announced on February 4, 2024. On June 13, FIFA released an updated schedule, with specific pairings assigned to venues for the knockout stage. The full schedule was unveiled in a live broadcast on December 6, 2025, the day after the draw. The opening match of the tournament included Mexico, and took place on June 11, 2026, at the Estadio Azteca in Mexico City. Canada's first match occurred on June 12 at BMO Field in Toronto, while the United States' opening match took place on the same day at SoFi Stadium in Inglewood. The national team of each host nation played its three group stage matches in its own country. AT&T Stadium in Arlington hosted the most matches of any venue, with nine. The U.S. hosted 78 matches, including all quarterfinals, semifinals, and the final, which was played at MetLife Stadium in East Rutherford on July 19. Canada and Mexico each hosted 13 matches. Each tournament venue, except for the Estadio Akron, hosted at least one knockout stage match. The match schedule overlapped with the 2026 Canadian Football League season, resulting in scheduling conflicts and loss of home games for the Toronto Argonauts and BC Lions. The match schedule also affected the 2026 Major League Baseball season schedules of the Kansas City Royals, Philadelphia Phillies, Seattle Mariners, and Texas Rangers, with home stadiums near World Cup venues. Host cities were geographically grouped into three regions:
Sources: en.wikipedia.org
It is a seven-amino-acid peptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro, produced by chemical synthesis rather than extracted from biological tissue. Its design is based on tuftsin, a natural immunomodulatory tetrapeptide. The C-terminal Pro-Gly-Pro segment is a common stabilising motif in short regulatory peptides.
The core four residues correspond to tuftsin, which occurs naturally as part of immunoglobulin G. The full seven-residue sequence, however, is not a known endogenous peptide. It is a laboratory-designed analogue intended to combine tuftsin-like activity with greater resistance to breakdown.
No single receptor has been confirmed as the primary target. Reports describe involvement of the GABAergic system, interference with enkephalin degradation, and shifts in neurotrophic factor expression. Because these observations come from different models and assays, they have not yet been integrated into one accepted mechanism.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, designed as a metabolically stabilized analogue of the endogenous tetrapeptide tuftsin. It has been studied mainly against anxiety-related and cognitive endpoints rather than as an approved medicine in most jurisdictions.