Selank 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 2026-06-21. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Tuftsin, the parent structure, is a naturally occurring immunomodulatory tetrapeptide released from the Fc region of immunoglobulin G by spleen enzymes. Selank extends this four-residue sequence with three additional amino acids. The stated rationale is that the added tail slows enzymatic breakdown and may influence receptor interactions. How the full heptapeptide behaves at the molecular level is not firmly established, and proposed mechanisms often involve indirect modulation of neurotransmitter or immune signaling rather than a single defined target.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilised solid form |
| Solubility class | Freely soluble in water | Hydrophilic heptapeptide |
| Dry storage temperature | -20 degrees Celsius or lower | Sealed, desiccated, protected from light |
| Solution storage | 2 to 8 degrees Celsius short term | Avoid repeated freeze-thaw cycles |
| Common identification method | Reversed-phase HPLC with mass spectrometry | Confirms purity and molecular mass |
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.
Proposed mechanisms center on modulation of the GABA system, but no single molecular target has been confirmed. Rodent studies report changes in GABA-A receptor expression and in the turnover of serotonin, dopamine, and norepinephrine in several brain regions. Increases in brain-derived neurotrophic factor and its receptor have also been described after repeated administration. These findings come largely from animal models, and the degree to which they describe human neurochemistry remains an open question. The mechanism is best characterized as multi-system and not fully resolved.
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.
The compound has a calculated molecular weight near 751.9 daltons and carries a net positive charge at physiological pH because of its arginine residue. It dissolves freely in water and in common aqueous buffers, and typically appears as a white or off-white lyophilized powder. The amide backbone makes the molecule susceptible to peptidases, which limits oral use and favors intranasal or parenteral routes. Nomenclature in the literature varies: the substance is also described by the sequence abbreviation TP-7 and by a Russian trade designation.
When the pipe surface's roughness height ε is significant (typically at high Reynolds number), the friction factor departs from the smooth pipe curve, ultimately approaching an asymptotic value ("rough pipe" regime). In this regime, the resistance to flow varies according to the square of the mean flow velocity and is insensitive to Reynolds number. Here, it is useful to employ yet another dimensionless parameter of the flow, the roughness Reynolds number
=== Surface modification improving stability === Following the formation of porous silicon, its surface is covered with covalently bonded hydrogen. Although the hydrogen coated surface is sufficiently stable when exposed to inert atmosphere for a short period of time, prolonged exposure render the surface prone to oxidation by atmospheric oxygen. The oxidation promotes instability in the surface and is undesirable for many applications. Thus, several methods were developed to promote the surface stability of porous silicon. An approach that can be taken is through thermal oxidation. The process involves heating the silicon to a temperature above 1000 C to promote full oxidation of silicon. The method reportedly produced samples with good stability to aging and electronic surface passivation. Porous silicon exhibits a high degree of biocompatibility. The large surface area enables organic molecules to adhere well. It degrades to Orthosillicic acid (H4SiO4), which causes no harm to the body. This has opened potential applications in medicine such as a framework of the growth of bone.
Newsom campaigned on reducing the cost of health care and increasing access. He also indicated his support for creating a universal state health-care system. The budget passed in June 2019 expanded eligibility for Medi-Cal from solely undocumented minor children to undocumented young adults from ages 19 to 25. In 2021, Newsom signed legislation expanding Medi-Cal eligibility to undocumented residents over age 50. On June 30, 2022, he signed a $307.9 billion state budget that "pledges to make all low-income adults eligible for the state's Medicaid program by 2024 regardless of their immigration status." This budget would make California the first U.S. state to guarantee healthcare to all low-income undocumented immigrants, at a cost of $2.7 billion per year. Newsom was criticized in early 2022 for walking back from his support for universal health care and not supporting CalCare, Assembly Bill 1400, which would have instituted single-payer healthcare in California; critics suggested that opposition from business interests, which had donated large sums to Newsom and his party, had swayed his opinion. On July 6, 2022, Newsom signed Senate Bill 184, which established the Office of Health Care Affordability, with the stated goal to "develop data-informed policies and enforceable cost targets, with the ultimate goal of containing health care costs". In August 2022, Newsom vetoed Senate Bill 57 which sought to authorize jurisdictions to approve supervised injection sites. Newsom signed The Zacky Bill. In October 2023, Newsom vetoed a bill to cap co-pays for insulin at $35.
== Clinical significance == LPS exposure induces LBP production. LBP is synthesized by the liver, adipose tissue, and intestinal cells. Dietary glucose and saturated fats acutely increase plasma LBP. The proinflammatory activity of plasma LPS is increased by LBP, which is higher in obesity. Plasma LBP is used as a better biomarker of plasma LPS than LPS itself due to the short half-life of LPS.
John Neely Kennedy (born November 21, 1951) is an American politician and attorney who has served as the junior United States senator from Louisiana since 2017. A member of the Republican Party, he served as the Louisiana State Treasurer from 2000 to 2017, as Secretary of the Louisiana Department of Revenue from 1996 to 1999, and as special counsel and then cabinet member to Governor Buddy Roemer from 1988 to 1992. Born in Centreville, Mississippi, Kennedy graduated from Vanderbilt University and the University of Virginia School of Law, and earned a law degree from the University of Oxford. In 1988, Governor Buddy Roemer selected Kennedy to serve as special legal counsel and later appointed him Secretary of the Cabinet. He left Roemer's staff in 1991 to run for state attorney general as a Democrat. In 1999, he was elected state treasurer; he was reelected in 2003, 2007, 2011, and 2015. Kennedy ran for U.S. Senate in 2004 and 2008. In August 2007, he became a Republican. In 2016, when U.S. senator David Vitter opted not to seek reelection, Kennedy ran for Senate again. He finished first in the November nonpartisan blanket primary and defeated State Public Service Commissioner Foster Campbell in the December runoff. He was sworn in on January 3, 2017. Kennedy was one of six Republican senators to object to the certification of Arizona's electors in the 2020 presidential election. In 2022, he was reelected to the Senate. Kennedy is set to be Louisiana's senior senator when Bill Cassidy leaves office in 2027.
Sources: en.wikipedia.org
In Ukraine the national revival of late 1980s led to the appreciation of Cossack history and culture as symbols of the Ukrainian nation. Cossack symbols and songs were widely used in mass events and demonstrations, particularly during the celebration of the 500th anniversary of the Zaporozhian Sich in 1990. A number of Ukrainian Cossack organizations emerged during that time. Cossacks have taken an active part in many of the conflicts that have taken place since the disintegration of the Soviet Union. These include the War of Transnistria, Georgian–Abkhazian conflict, Georgian–Ossetian conflict, First Nagorno-Karabakh War, 2016 Nagorno-Karabakh war, First Chechen War, Second Chechen War, and the 2014 pro-Russian unrest in Ukraine and both the subsequent War in Donbas and the 2022 Russian invasion of Ukraine.
=== Deficiency === Low plasma magnesium (hypomagnesemia) is common: it is found in 2.5–15% of the general population. From 2005 to 2006, 48 percent of the United States population consumed less magnesium than recommended in the Dietary Reference Intake. Other causes are increased renal or gastrointestinal loss, an increased intracellular shift, and proton-pump inhibitor antacid therapy. Most are asymptomatic, but symptoms referable to neuromuscular, cardiovascular, and metabolic dysfunction may occur. Alcoholism is often associated with magnesium deficiency. Chronically low serum magnesium levels are associated with metabolic syndrome, diabetes mellitus type 2, fasciculation, and hypertension.
11-Hydroxy-Δ9-tetrahydrocannabinol (11-OH-Δ9-THC, alternatively numbered as 7-OH-Δ1-THC), usually referred to as 11-hydroxy-THC within cannabis culture, is the main active metabolite of tetrahydrocannabinol (THC), the major psychoactive substance in cannabis. After cannabis consumption, THC is metabolized inside the body by cytochrome P450 enzymes such as CYP2C9 and CYP3A4 into 11-hydroxy-THC and then further metabolized by dehydrogenase and CYP2C9 enzymes to form 11-nor-9-carboxy-THC (THC-COOH), which is inactive at the CB1 receptors; and further glucuronidated to form 11-nor-Δ9-tetrahydrocannabinol-9-carboxylic acid glucuronide (Δ9-THC-COOH-glu) in the liver, from where it is subsequently excreted through feces and urine. Both metabolites can be assayed in drug tests. 11-hydroxy-THC is formed after human consumption of THC containing products regardless of administration route, although levels of 11-hydroxy-THC are typically higher when cannabis products are eaten instead of inhaled.
The basement membrane, also known as the basal lamina, is a specialized form of extracellular matrix (ECM) common to all multicellular animals. It is a very thin, flexible, and strong sheet-like type of ECM that provides a supporting base for all types of epithelial tissue, separates it from another cell layer such as endothelium, and anchors it to the underlying connective tissue (stroma). A basement membrane also surrounds some individual cells, including muscle cells, fat cells, and Schwann cells, separating them from surrounding connective tissue. Its composition can vary from tissue to tissue, and even in different regions of the same tissue. The other type of ECM is the interstitial matrix. The basement membrane may be described as having two layers or laminae, an external basal lamina, facing the epithelium, and an internal basal lamina that faces the connective tissue. These two laminae are also known as the basal lamina and the reticular lamina. The basement membrane also acts as a platform for complex cell signaling, for polarization, migration, and differentiation. It also regulates the exchange of materials between the epithelium and underlying tissues; binds growth factors from the connective tissue to the epithelium that control the development of epithelium. Epithelial cells are pressed closely together having no blood vessels between them but their basement membrane mostly rests on a bed of loose connective tissue that is rich in blood vessels providing nutrients and removing waste.
Sources: en.wikipedia.org
Dry powder is normally held at -20 degrees Celsius or below in a sealed, light-protected container with desiccant. Brief room-temperature handling during weighing is generally tolerated. Storage instructions vary between suppliers, so the accompanying certificate of analysis should be followed.
Reversed-phase HPLC establishes purity, while mass spectrometry confirms the expected molecular mass. Sequence confirmation may use tandem mass spectrometry or peptide mapping. A certificate of analysis typically reports these results alongside the analytical method applied.
In Russia it is a registered medicine available by prescription. In many other countries it is not approved for human use and is supplied only as a research chemical. Import and possession rules differ by jurisdiction, and buyers are responsible for checking local requirements.
Selank is a synthetic peptide made of seven amino acids. It is modeled on tuftsin, a natural tetrapeptide, with an added three-residue tail. It is not a small-molecule drug.