If you have been reading about intranasal delivery 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.
Last reviewed on 2026-06-13. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Pharmacokinetic accounts emphasize rapid breakdown. After intravenous dosing the intact peptide disappears from blood within minutes, and nasal delivery produces low but measurable concentrations. Metabolites rather than the parent molecule may account for part of the observed activity, although the relative contribution is unresolved. Dosing in the literature varies widely and no optimal schedule has been agreed. These gaps are regularly cited as a reason the findings have not produced broad clinical adoption beyond the original research setting.
Proposed mechanisms center on neurotrophic signaling rather than on classical melanocortin receptor activation. Rodent experiments have reported shifts in the expression of brain-derived neurotrophic factor and nerve growth factor after administration, together with changes in the associated receptor systems. Several authors argue that the peptide acts largely through its degradation products and their interaction with peptidergic pathways, but this remains a hypothesis rather than a settled finding. No single molecular target has been identified in a way that the field broadly accepts.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Analogue of the ACTH(4-10) fragment |
| Amino acid sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Single-letter form MEHFPGP |
| Molecular formula | C37H51N9O10S | Free peptide, nominal mass near 814 Da |
| First registration | 1994, Russia | Nasal formulation for neurological indications |
| Typical purity grade | 95% or higher by HPLC | Research material; higher grades used as reference standards |
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.
Quality documentation for research-grade peptide usually includes a certificate of analysis stating purity, identity, and residual counterion content. Batch-to-batch variation in purity and salt form is a recognized issue, and comparisons across suppliers require attention to the exact counterion, for example acetate versus trifluoroacetate. Sequence verification by tandem mass spectrometry provides stronger evidence than a single mass measurement. For any study reporting biological results, the analytical method and the measured purity should be stated explicitly. Independent verification of supplier claims is considered good practice.
Semax is supplied as a lyophilized powder that appears white to off-white. It dissolves readily in water, phosphate-buffered saline, and other aqueous media, which simplifies preparation of working solutions for laboratory use. The nasal products registered in Russia are dilute aqueous solutions, typically around 0.1 percent peptide by weight. Organic solvents are rarely necessary and can complicate handling. Because the peptide is hygroscopic, weighing should be performed quickly and with minimal exposure to ambient humidity.
=== UK 1947–1991 === Shortly after being named in testimony before the House Un-American Activities Committee, the Eltentons returned to England. He first took a senior position at the Shell physics research laboratory, but after investigation by MI5 was moved to an area solely concerned with refinery operations.
=== Pharmacokinetics === A study comprehensively reviewed the metabolism of 3-HO-PCE by using human liver microsomes and samples, both biological and non-biological, from a volunteer. The first major metabolic pathway involves N-dealkylation, yielding the primary amine metabolite 3-HO-PCA. The second pathway causes the molecule to undergo oxidation, creating phenol-3-HO-PCE and hydroxy-3-HO-PCE. These compounds then undergo dehydration, creating dehydro-3-HO-PCE (which is also created directly from the parent compound via dehydrogenation). The third pathway causes the parent compound to undergo oxidative deamination, creating 1-(3'-hydroxyphenyl) cyclohexanol. This compound can either undergo oxidation and dehydrogenation to form dihydroxy-[1,1'-bi(cyclohexan)]-1-en-3-one, or a pathway involving dehydration and allylic oxidation to eventually form 3'4'-dihydro-[1,1'-biphenyl]-3-ol. The fourth pathway is phase II conjugation, where the parent compound undergoes O-glucuronidation to form 3-OGlu-PCE.
manufacturers of processed food, aware of the possible contribution of their products to the obesity epidemic, met together and discussed the problem as early as April 8, 1999; however, a proactive strategy was considered and rejected. As a general rule, optimizing the amount of salt, sugar and fat in a product will improve its palatability, and profitability. Reducing salt, sugar and fat, for the purpose of public health, had the potential to decrease palatability and profitability. Media influence may play an important role in prevention of obesity as it has the ability to boost many of the main prevention/intervention methods used nowadays including lifestyle modification. The media is also highly influential on children and teenagers as it promotes healthy body image and sets societal goals for lifestyle improvement. Examples of media influence are support for the "Let's Move!" campaign and the MyPlate program initiated by Michelle Obama, and the NFL's Play60 campaign. These campaigns promote physical activity in an effort to reduce obesity especially for children. In 2011, the Obama administration introduced a $400 million Healthy Food Financing Initiative, the goal of the program is to "create jobs and economic development, and establish market opportunities for farmers and ranchers," as described by the secretary of agriculture, Tom Vilsack. Population-based approaches have been recommended and pursued in the U.S. Obesity is complex because it affects multiple environments, involves multiple industries and sectors, and affects both energy intake and expenditure.
The body normally gets the iron it requires from food. If a person consumes too little iron, or iron that is poorly absorbed (non-heme iron), they can become iron-deficient over time. Examples of iron-rich foods include meat, eggs, leafy green vegetables and iron-fortified foods. For proper growth and development, infants and children need dietary iron. For children, a high intake of cow's milk is associated with an increased risk of iron-deficiency anemia. Other risk factors (at least in toddlers) include low meat intake and low intake of iron-fortified products. The National Academy of Medicine updated Estimated Average Requirements (EAR) and Recommended Dietary Allowances (RDA) in 2001. The current EAR for iron for women ages 14–18 is 7.9 mg/day, 8.1 for ages 19–50, and 5.0 thereafter (post menopause). For men, the EAR is 6.0 mg/day for ages 19 and up. The RDA is 15.0 mg/day for women ages 15–18, 18.0 for 19–50, and 8.0 thereafter; for men, 8.0 mg/day for ages 19 and up. (Recommended Dietary Allowances are higher than Estimated Average Requirements so as to cover people with higher than average requirements.) The RDA for pregnancy is 27 mg/day, and during lactation, 9 mg/day. For children ages 1–3 years, it is 7 mg/day, 10 for ages 4–8, and 8 for ages 9–13. The European Food Safety Authority refers to the collective set of information as Dietary Reference Values, with Population Reference Intakes instead of RDAs, and Average Requirements instead of EARs.
On April 12, 1961, the USSR surprised the world by launching Yuri Gagarin into a single, 108-minute orbit around the Earth in a craft called Vostok 1. They dubbed Gagarin the first cosmonaut, roughly translated from Russian and Greek as "sailor of the universe". Gagarin's capsule was flown in automatic mode, since doctors did not know what would happen to a human in the weightlessness of space; but Gagarin was given an envelope containing the code that would unlock manual control in an emergency. Gagarin became a national hero of the Soviet Union and the Eastern Bloc, and a worldwide celebrity. Moscow and other cities in the USSR held mass demonstrations, the scale of which was second only to the World War II Victory Parade of 1945. April 12 was declared Cosmonautics Day in the USSR, and is celebrated today in Russia as one of the official "Commemorative Dates of Russia." In 2011, it was declared the International Day of Human Space Flight by the United Nations. The USSR demonstrated 24-hour launch pad turnaround and launched two piloted spacecraft, Vostok 3 and Vostok 4, in essentially identical orbits, on August 11 and 12, 1962. The two spacecraft came within approximately 6.5 kilometers (3.5 nautical miles) of one another, close enough for radio communication, but then drifted as far apart as 2,850 kilometers (1,540 nautical miles). The Vostok had no maneuvering rockets to keep the two craft a controlled distance apart. Vostok 4 also set a record of nearly four days in space.
Sources: en.wikipedia.org
=== Density === The alkali metals all have the same crystal structure (body-centred cubic) and thus the only relevant factors are the number of atoms that can fit into a certain volume and the mass of one of the atoms, since density is defined as mass per unit volume. The first factor depends on the volume of the atom and thus the atomic radius, which increases going down the group; thus, the volume of an alkali metal atom increases going down the group. The mass of an alkali metal atom also increases going down the group. Thus, the trend for the densities of the alkali metals depends on their atomic weights and atomic radii; if figures for these two factors are known, the ratios between the densities of the alkali metals can then be calculated. The resultant trend is that the densities of the alkali metals increase down the table, with an exception at potassium. Due to having the lowest atomic weight and the largest atomic radius of all the elements in their periods, the alkali metals are the least dense metals in the periodic table. Lithium, sodium, and potassium are the only three metals in the periodic table that are less dense than water: in fact, lithium is the least dense known solid at room temperature.
== Symptoms == EPM6 is classically characterised by first beginning motor delay, decreased muscle tone, gait issues, absent reflexes. At around age 4, patients usually develop ataxia; later (around age 6), they develop myoclonus. Myoclonus is more prominient in upper extremity than in lower, also they can experience myoclonus of tongue and around the mouth. Before age 20, patients might also develop epileptic seizures, also during the first decade, patients experience dysarthric speech; later, around the second/third decade, some patients experience dysphagia. Scoliosis (abnormal curvature of spine) can be seen in patients before first/second decade, also most of the patients became wheelchair-bound (around at the age 13). Increased creatine kinase levels can be seen, in addition patients usually have preserved cognition until late course of the disorder.
=== United States === The approach in the United States to stop money laundering is usually broken into two areas: preventive (regulatory) measures, and prosecutorial measures. In the United States, whistleblowers can report money laundering activities to the Financial Crimes Enforcement Network (FinCEN) or the Securities and Exchange Commission (SEC) if the case also implicates a security.
=== Prominent cases === In the 1994 FIFA World Cup, the Argentine footballer Diego Armando Maradona tested positive for ephedrine. The Japanese motorcycle racer Noriyuki Haga tested positive for ephedrine in 2000, being disqualified from two races and banned from two more as a result. NFL punter Todd Sauerbrun of the Denver Broncos was suspended for the first month of the 2006 season after testing positive for ephedrine.
Sources: en.wikipedia.org
==== Supranational ==== United Nations: UN Assistance Mission in Afghanistan (UNAMA) urged both nations to cease hostilities and to take steps to prevent harm to civilians. Richard Bennett, the UN Special Rapporteur on the situation of human rights in Afghanistan, expressed concern over airstrikes in Nangarhar and Paktika, calling on the belligerent parties to exercise "maximum restraint". He stated deep concern for "a significant number of children and civilians" who were killed following the hostilities. European Union: In a brief statement, the EU Council called on all actors for immediate de-escalation and a halt of hostilities in the area. It reiterated to the Taliban that Afghan territory must not be used to threaten or attack other countries and calls on them to take effective action against all terrorist groups operating in or from Afghanistan.
== Synthesis of nucleotides == Nucleotides are the monomers that polymerize to form nucleic acids. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base. The nitrogenous bases found in nucleic acids belong to one of two categories: purines or pyrimidines. In complex multicellular animals, both purines and pyrimidines are primarily synthesized in the liver, but they follow distinct biosynthetic pathways. However, all nucleotide synthesis requires phosphoribosyl pyrophosphate (PRPP), which donates the ribose and phosphate needed to form a nucleotide.
In addition, although the amide of asparagine is a weak nucleophile, it can serve as an attachment point for glycans. Rarer modifications can occur at oxidized methionines and at some methylene groups in side chains. Post-translational modification of proteins can be experimentally detected by a variety of techniques, including mass spectrometry, Eastern blotting, and Western blotting.
Sources: en.wikipedia.org
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.
No. The peptide is synthetic, although it is modelled on a fragment of a naturally occurring hormone. ACTH(4-10) is generated when ACTH is cleaved, but the Pro-Gly-Pro extension is not a known endogenous sequence. It is therefore a designed analogue rather than a natural metabolite.
The label reflects reported effects on attention, memory and recovery after neurological injury in regional clinical reports. Those reports are mostly small and have not been widely replicated outside the region. The classification is descriptive and does not imply a single defined mechanism.
The main proposal is modulation of neurotrophic factors such as brain-derived neurotrophic factor, supported largely by animal experiments. Receptor-level targets have not been firmly established. Most reviews describe the mechanism as only partially characterized.