Semax 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.
Updated 2026-02-16. Numbers and descriptions here follow the published literature rather than marketing material.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
Scientific literature on semax is unevenly distributed. A substantial share of published work originates from a small number of laboratories in Russia, while independent replication elsewhere is limited. Human data consist mostly of small trials with short follow-up, and several reported outcomes rely on subjective rating scales. Questions about how much intact peptide reaches the central nervous system after nasal administration, and how long it persists there, are still unresolved. The compound is best described as an active research subject rather than a settled pharmacological agent.
Published research has focused mainly on neurological and cognitive endpoints in animal models, with proposed mechanisms involving brain-derived neurotrophic factor and related signalling pathways. A substantial share of the human data originates from a limited number of research groups, and independent replication in other countries remains sparse. Regulatory status reflects that distribution: the peptide is registered as a medicine in Russia and appears in some neighbouring markets, while elsewhere it is handled as a research chemical without approved therapeutic labelling. Questions about dose-response relationships, long-term effects, and comparability across studies are still open.
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
Identity and purity are confirmed with reversed-phase high-performance liquid chromatography, typically monitored at 214 nanometres where the peptide bond absorbs. Mass spectrometry, either electrospray or MALDI-TOF, verifies molecular mass against the theoretical value and detects truncation or adduct formation. Amino acid analysis and peptide mapping provide additional confirmation when required. The most frequently reported impurities are deletion sequences from incomplete coupling, methionine sulfoxide from oxidation, and dimeric species formed through non-covalent aggregation. Impurity profiles depend strongly on the synthesis and purification route chosen by the producer.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Calculated for the free peptide |
| Molar mass | 813.9 g/mol | Anhydrous free base |
| Peptide class | Synthetic heptapeptide | ACTH(4-10) analogue |
| Parent fragment | ACTH(4-10) | Adrenocorticotropic hormone segment |
| Developmental origin | Institute of Molecular Genetics, Moscow | Work began in the 1980s |
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
Solid material is normally kept at minus 20 degrees Celsius in a sealed, desiccated container. Reconstituted solutions are less stable and are usually divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of activity. Light exposure is minimized by using amber glassware or foil wrapping. Published stability data for this peptide are sparse, so recommended storage conditions rest mainly on general practice for short synthetic peptides rather than on dedicated study.
Identity and purity are commonly assessed by reversed-phase high-performance liquid chromatography, with ultraviolet detection near 214 nanometers for the peptide backbone. Mass spectrometry, either electrospray or matrix-assisted laser desorption, confirms molecular mass and detects truncation or modification products. Amino acid analysis can verify composition. Because the sequence contains no strongly absorbing aromatic residue apart from phenylalanine, detection wavelengths are chosen carefully. Purity values above 95 percent are typical for research-grade material.
The flavour of cider varies. Ciders can be classified from dry to sweet. Their appearance ranges from cloudy with sediment to completely clear, and their colour ranges from almost colourless to amber to brown. The variations in clarity and colour are mostly due to filtering between pressing and fermentation. Some apple varieties will produce a clear cider without any need for filtration. Both sparkling and still ciders are made; the sparkling variety is the more common. Modern, mass-produced ciders closely resemble sparkling wine in appearance. More traditional brands tend to be darker and cloudier. They are often stronger than the mass-produced varieties and taste more strongly of apples. Almost colourless, white cider has the same apple juice content as conventional cider but is harder to create because the cider maker has to blend various apples to create a clearer liquid. White ciders tend to be sweeter and more refreshing. They are typically 7–8% ABV in strength. Black cider, by contrast, is dry amber cider which has an alcohol content of 7–8% ABV.
== Treatment == Cardiac and respiratory complications are treated symptomatically. Physical and occupational therapy may be beneficial for some patients. Alterations in diet may provide temporary improvement but will not alter the course of the disease. Genetic counseling can provide families with information regarding risk in future pregnancies. On April 28, 2006, the US Food and Drug Administration (FDA) approved a biologic license application (BLA) for alglucosidase alfa, rhGAA (Myozyme), the first treatment for patients with Pompe disease, developed by a team of Duke University researchers. This was based on enzyme replacement therapy using biologically active recombinant human alglucosidase alfa produced in Chinese Hamster Ovary cells. Myozyme falls under the FDA orphan drug designation and was approved under a priority review. The FDA approved Myozyme for administration by intravenous infusion of the solution. The safety and efficacy of Myozyme were assessed in two separate clinical trials in 39 infantile-onset patients with Pompe disease ranging in age from 1 month to 3.5 years at the time of the first infusion. Myozyme treatment prolongs ventilator-free survival and overall survival. Early diagnosis and early treatment lead to much better outcomes. The treatment is not without side effects which include fever, flushing, skin rash, increased heart rate, and even shock; these conditions, however, are usually manageable.
Israel has used Palestinian children as human shields in Gaza in violation of Geneva conventions. Human rights groups have said that "even if Hamas were using human shields", Israel must still abide by international law, especially the principle of proportionality. In May 2023, before the beginning of the Gaza war, Defence for Children International – Palestine (DCIP) had already documented that five children had been used as human shields by the Israeli army since the beginning of that year, with two of the victims being 2-year-old twins. According to a 2024 Haaretz investigation based on many Israeli soldiers' testimony, Palestinian teenagers, adults, and occasionally elderly men are regularly used as human shields to explore the tunnel network in the Gaza Strip. These shawashim are dressed up, apart from sandshoes, to look like Israeli soldiers, handcuffed, blindfolded and, with a video camera attached to their bodies, sent into houses where Hamas combatants are suspected to hide, or into tunnels that might be booby-trapped. The practice is said to be widely known to IDF field commanders. Palestinians were used when neither sniffer dogs nor drones were available. An October 2024 investigation by CNN found that while the scale and scope of the practice was unknown, testimony from civilians and an Israeli soldier showed Israel's use of Palestinians as human shields was widespread across the Gaza Strip.
Research of arthrogryposis has shown that anything that inhibits normal joint movement before birth can result in joint contractures. Arthrogryposis could be caused by genetic and environmental factors. In principle: any factor that curtails fetal movement can result in congenital contractures. The exact causes of arthrogryposis are unknown.
The features of BPD include emotional instability, intense and unstable interpersonal relationships, a need for intimacy, and a fear of rejection. As a result, people with BPD often evoke intense emotions in those around them. Pejorative terms to describe people with BPD, such as "difficult", "treatment resistant", "manipulative", "demanding", and "attention seeking", are often used and may become a self-fulfilling prophecy, as the negative treatment of these individuals may trigger further self-destructive behavior. Since BPD can be a stigmatizing diagnosis even within the mental health community, some survivors of childhood abuse who are diagnosed with BPD are re-traumatized by the negative responses they receive from healthcare providers. Certain experts, like Dr. Gillian Proctor and Dr. Karen Williams, argue it would be better to diagnose these people with post-traumatic stress disorder (PTSD), as this would acknowledge the impact of abuse on their behavior, especially given BPD's prevalence in women who have experienced sexual abuse, as well as reduce stigma. Critics of the PTSD diagnosis argue that it medicalizes abuse rather than addressing the root causes in society. Regardless, a diagnosis of PTSD does not encompass all aspects of the disorder (see brain abnormalities and terminology). Some clients feel the diagnosis is helpful, allowing them to understand that they are not alone and to connect with others with BPD who have developed helpful coping mechanisms.
Sources: en.wikipedia.org
== Research == György Kéri was an internationally recognized expert on signal transduction therapy and personalized therapy. His pioneering work focused on the utilization of signal transduction therapy approach in the pharmaceutical research. He achieved outstanding results in the research and development of peptide hormone derivatives and kinase inhibitors as antitumor agents. He was involved in the development of a signal-inhibiting somatostatin peptide compound (TT-232), which reached Phase II clinical trials, and SU101, which reached Phase III clinical trials. Vichem – the company he co-founded in 1999 – developed a kinase inhibitor library, and a hit finding technology called Nested Chemical Library™ technology and an allosteric library for inhibiting protein-protein interactions. He has developed at Vichem the DriverHit Library™ for inhibiting the signaling pathways activated by cancer driver genes or mutated tumor suppressor genes. He also participated with German researchers in the development of a new proteomic technology (Target Fishing technology) which makes it possible to identify unknown targets in the signal transduction network or the interacting enzymes of the metabolome. Over a hundred international patents or patent applications can be linked to his name, while he is a co-author of more than 250 publications in international scientific journals and several book chapters.
==== Papillary region ==== The papillary region is composed of loose areolar connective tissue. It is named for its finger-like projections called papillae, which extend toward the epidermis. The papillae provide the dermis with a "bumpy" surface that interdigitates with the epidermis, strengthening the connection between the two layers of skin. In the palms, fingers, soles, and toes, the influence of the papillae projecting into the epidermis forms contours in the skin's surface. These epidermal ridges occur in patterns (see: fingerprint) that are genetically and epigenetically determined and are therefore unique to the individual, making it possible to use fingerprints or footprints as a means of identification.
== Contraindications == Methamphetamine is contraindicated in individuals with a history of substance use disorder, heart disease, or severe agitation or anxiety, or in individuals currently experiencing arteriosclerosis, glaucoma, hyperthyroidism, or severe hypertension. The FDA states that individuals who have experienced hypersensitivity reactions to other stimulants in the past or are currently taking monoamine oxidase inhibitors should not take methamphetamine. The FDA also advises individuals with bipolar disorder, depression, elevated blood pressure, liver or kidney problems, mania, psychosis, Raynaud's phenomenon, seizures, thyroid problems, tics, or Tourette syndrome to monitor their symptoms while taking methamphetamine. Owing to the potential for stunted growth, the FDA advises monitoring the height and weight of growing children and adolescents during treatment.
20 July A race riot at Marine Corps Base Camp Lejeune resulted in the death of one Marine. The Navy issued the plan for Operation Duck Hook a program of massive bombing of North Vietnam commissioned by National Security Advisor Henry Kissinger.
Sources: en.wikipedia.org
==== Encoded combinatorial libraries ==== When dealing with a non-peptide organic libraries library, it is not as simple to determine the identity of the content of a bead as in the case of a peptide one. In order to circumvent this difficulty, methods have been developed to attach molecules that encode the structure of the compound formed in the bead to the beads, in parallel with the synthesis of the library. Ohlmeyer and his colleagues published a binary encoding method. They used mixtures of 18 tagging molecules that, after cleaving them from the beads, could be identified by Electron Capture Gas Chromatography. Sarkar et al. describe chiral oligomers of pentenoic amides (COPAs) that can be used to construct mass encoded OBOC libraries. Kerr et al. introduced an innovative encoding method. An orthogonally protected removable bifunctional linker was attached to the beads. One end of the linker was used to attach the non-natural building blocks of the library, while encoding amino acid triplets were linked to the other end. The building blocks were non-natural amino acids and the series of their encoding amino acid triplets could be determined by Edman degradation. The important aspect of this kind of encoding was the possibility to cleave down from the beads the library members together with their attached encoding tags forming a soluble library. The same approach was used by Nikolajev et al. for encoding with peptides. In 1992, Brenner and Lerner introduced DNA sequences to encode the beads of the solid support that proved to be the most successful encoding method.
=== Vanuatu === The Pacific island-state of Vanuatu has passed legislation to regulate the quality of its kava exports. Vanuatu prohibits the export or consumption of non-noble kava varieties or the parts of the plant that are unsuitable for consumption (such as leaves and stems).
=== HPV-77 === The first successful strain to be used was the HPV-77, prepared by passing the virus through the cells of an African green monkey kidney 77 times. The efforts to develop the vaccine were conducted by a team of researchers at the National Institutes of Health's Division of Biologics Standards. Led by Harry M. Meyer and Paul D. Parkman, the team included Hope E. Hopps, Ruth L. Kirschstein, and Rudyard Wallace among others, the team began serious work on the vaccine with the arrival of a major rubella epidemic in the United States in 1964. Prior to arriving at the National Institutes of Health (NIH), Parkman had been working on isolating the rubella virus for the Army. He joined the laboratory of Harry Meyer. Parkman, Meyer, and the team from the NIH tested the vaccine at the Children's Colony in Conway, Arkansas in 1965 while a rubella epidemic still raged across the United States. This residential home provided care for children with cognitive disabilities and children who were ill. The ability to isolate children in their cabins and control access to the children made it an ideal location for testing a vaccine without starting an epidemic of rubella. Each of the children's parents provided consent for the participation in the trial. In June 1969, the NIH issued the first license for commercial production of the rubella vaccine to the pharmaceutical company Merck Sharp & Dohme. This vaccine made use of the HPV77 rubella strain and was produced in duck embryo cells.
The Captagon was all destroyed by the new government; "Khattab", a pseudonym of one of the former rebels said "We destroyed and burned it because it's harmful to people. It harms nature and people and humans." The New York Times reported in December 2021 that the Syrian Army's elite 4th Armoured Division, commanded by Maher al-Assad, the brother of Syrian President Bashar al-Assad, oversaw much of the production and distribution of fenethylline, among other drugs. The unit controlled manufacturing facilities, packing plants, and smuggling networks all across Syria, and had started to deal in crystal meth. The division's security bureau, headed by Maj. Gen. Ghassan Bilal, provided protection for factories and along smuggling routes to the port city Latakia and to border crossings with Jordan and Lebanon. Jihad Yazigi, editor of The Syria Report, reported that fenethylline had "probably become Syria's most important source of foreign currency."
=== Domestication === Wild potato species occur from the southern United States to southern Chile. The potato was first domesticated in southern Peru and northwestern Bolivia by pre-Columbian farmers, around Lake Titicaca. Potatoes were domesticated there about 7,000–10,000 years ago from a species in the S. brevicaule complex. The earliest archaeologically verified potato tuber remains have been found at the coastal site of Ancon (central Peru), dating to 2500 BC. The most widely cultivated variety, Solanum tuberosum tuberosum, is indigenous to the Chiloé Archipelago, and has been cultivated by the local indigenous people since before the Spanish conquest.
Sources: en.wikipedia.org
Semax is based on the ACTH(4-10) fragment, a seven-amino-acid segment of adrenocorticotropic hormone. The synthetic peptide retains the core sequence while removing regions associated with endocrine activity. This modification is intended to isolate effects on the nervous system.
It is registered for clinical use in Russia and a few other countries, typically as a nasal drop formulation. It does not hold approval from the United States Food and Drug Administration or the European Medicines Agency. Outside those markets it is generally handled as a research chemical.
The compound was developed in Moscow and the earliest studies were conducted there, so the primary literature is largely in Russian-language journals. Translation and indexing have been incomplete, which limits access for outside researchers. Independent groups have since published some work, but the total volume remains modest.
Reversed-phase HPLC gives the main purity figure, most often with UV detection near 214 nanometres. Mass spectrometry then confirms the molecular mass. Together the two methods distinguish a correct sequence from a closely related impurity.