nasal drops 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.
Updated 2026-06-25. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
Published research covers ischemic stroke, traumatic brain injury, cognitive impairment, optic nerve conditions and attention-related measures. Much of the human evidence comes from small trials conducted in one country, which limits how far the results generalize. Animal models supply the larger share of the data, and effects seen in rodents do not transfer automatically to people. Reviews have noted that methodological reporting is often incomplete, making it difficult to pool results or compare treatment schedules across studies.
| 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.
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.
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.
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
The 10th-century church in Rossano, together with the "twin" church of Sant'Adriano in San Demetrio Corone (foundation 955, rebuilt by the Normans on the still visible foundation of the previous Byzantine church), are considered among the country's best preserved Byzantine churches. They were built by St. Nilus the Younger as a retreat for the monks who lived in the tufa grottos underneath. The present name of Calabria comes from the duchy of Calabria. Around 800, Saracens began invading Calabria, attempting to wrest control from the Byzantines. This group of Arabs had been successful in Sicily. The people of Calabria retreated into the mountains. Although the Arabs never got a strong hold on the whole of Calabria, they did control some villages while enhancing trade relations with the eastern world. In 918, Saracens captured Reggio (which they renamed Rivà), holding many of its inhabitants to ransom or enslaving them. During this time many staples of later Calabrian cuisine came into fashion: citrus fruits and eggplants for example. Exotic spices such as cloves and nutmeg were introduced. Under Byzantine rule, between the end of the 9th and the beginning of the 10th century, Calabria was one of Italy's first regions to introduce silk production. Mulberry trees for the production of raw silk were introduced to southern Italy by the Byzantines at the end of the ninth century. Around 1050 Calabria had 24,000 mulberry trees cultivated for their foliage. At the beginning of the 10th century (c.
== External links == Safety MSDS data Mohajer, Fatemeh; Mohammadi Ziarani, Ghodsi (2021). "An Overview of Quantitative and Qualitative Approaches on the Synthesis of Heterocyclic Kojic Acid Scaffolds through the Multi-Component Reactions". Heterocycles. 102 (2). Japan Institute of Heterocyclic Chemistry: 211. doi:10.3987/REV-20-936.
Watch manufacture was becoming streamlined; the Japy family of Schaffhausen, Switzerland, led the way in this, and soon afterwards the newborn American watch industry developed much new machinery, so that by 1865 the American Watch Company (afterwards known as Waltham) could turn out more than 50,000 reliable watches each year. This development drove the Swiss out of their dominating position at the cheaper end of the market, compelling them to raise the quality of their products and establish themselves as the leaders in precision and accuracy instead.
=== Obesity and metabolic disorders === Microbial therapeutics are also being explored as treatments for obesity and metabolic diseases such as diabetes. Certain gut microorganisms influence how the body absorbs nutrients, stores energy, and regulates blood sugar. By changing the activity or composition of these microbes, it may be possible to improve metabolic health. In addition, genetically engineered bacterial and yeast have been developed to produce hormones that help regulate appetite and glucose levels. For example, some engineered microbes release substances similar to the hormone glucagon-like peptide-1 (GLP-1), which supports insulin release and promotes feelings of fullness. Because these microbes can live in the gut, they may provide longer-lasting effects than traditional medications.
Antibiotics for bacterial infections. Antivirals for viral infections. Antifungals for fungal infections. Antiprotozoals for protozoan infections. Antihelminthics for infections caused by parasitic worms. Infectious diseases remain a significant global health concern; communicable, maternal, neonatal, and nutritional diseases together accounted for an estimated 18.6% of global deaths in 2017. The branch of medicine that focuses on infections is referred to as infectious diseases.
Sources: en.wikipedia.org
== Biosynthesis and industrial route == In terms of its biosynthesis, it is formed by the degradation of dihydrouracil and carnosine. β-Alanine ethyl ester is the ethyl ester which hydrolyses within the body to form β-alanine. It is produced industrially by the reaction of ammonia with β-propiolactone. Sources for β-alanine includes pyrimidine catabolism of cytosine and uracil.
Cry Freedom is a 1987 epic biographical drama film directed and produced by Richard Attenborough, set in apartheid-era South Africa in 1977. The screenplay was written by John Briley based on a pair of books by journalist Donald Woods. The film centres on the real-life events involving South African activist Steve Biko and his friend Woods, who initially finds him too radical, and attempts to understand his way of life. Denzel Washington stars as Biko, while Kevin Kline portrays Woods. Penelope Wilton co-stars as Woods's wife Wendy. Cry Freedom delves into the ideas of racism, segregation, disenfranchisement, socioeconomic inequality, political corruption, and the repercussions of violence. A joint collective effort to commit to the film's production was made by Universal Pictures and Marble Arch Productions and the film was primarily shot on location in Zimbabwe due to not being allowed to film in South Africa at the time of production. It was commercially distributed by Universal Pictures, opening in the United States on 6 November 1987. South African authorities unexpectedly allowed the film to be screened in cinemas without cuts or restrictions, despite the publication of Biko's writings being banned at the time of its release. The film was generally met with favourable reviews and earned theatrical rentals of $15 million worldwide. The film was nominated for multiple awards, including Academy Award nominations for Best Supporting Actor (for Washington), Best Original Score, and Best Original Song.
== History == From the time of Hippocrates it has been known that bone has considerable potential for regeneration and repair. Nicholas Senn, a surgeon at Rush Medical College in Chicago, described the utility of antiseptic decalcified bone implants in the treatment of osteomyelitis and certain bone deformities. Pierre Lacroix proposed that there might be a hypothetical substance, osteogenin, that might initiate bone growth. The biological basis of bone morphogenesis was shown by Marshall R. Urist. Urist made the key discovery that demineralized, lyophilized segments of bone induced new bone formation when implanted in muscle pouches in rabbits. This discovery was published in 1965 by Urist in Science. Urist proposed the name "Bone Morphogenetic Protein" in the scientific literature in the Journal of Dental Research in 1971. Bone induction is a sequential multistep cascade. The key steps in this cascade are chemotaxis, mitosis, and differentiation. Early studies by Hari Reddi unraveled the sequence of events involved in bone-matrix-induced bone morphogenesis. On the basis of the above work, it seemed likely that morphogens were present in the bone matrix. Using a battery of bioassays for bone formation, a systematic study was undertaken to isolate and purify putative bone morphogenetic proteins. A major stumbling block to purification was the insolubility of demineralized bone matrix. To overcome this hurdle, Hari Reddi and Kuber Sampath used dissociative extractants, such as 4M guanidine HCL, 8M urea, or 1% SDS.
==== From the Little Union to the Great War ==== The modern Romanian state was created through the unification of the principalities of Moldavia and Wallachia, accepted as a federative structure by the Great Powers following the Paris Convention of 1858, and later cemented by the simultaneous election as ruler of both states of the unionist Alexandru Ioan Cuza. After carrying out numerous reforms that laid the foundations for the modernisation of the state, he was forced in 1866 by a broad coalition of the political parties of the time, also known as the "Monstrous coalition", to abdicate and leave the country. The union was at one time in peril, but the political leaders of the era succeeded in placing on the princely throne Carol I of Romania, who accepted the Constitution and took the oath on 10 May 1866. Eleven years later, on 10 May 1877, Romania proclaimed its independence—achieved on the battlefield—and in 1881, on the same day of the year, Carol was crowned as King of Romania. In 1913, Romania entered the Second Balkan War against Bulgaria, at the end of which it obtained Southern Dobruja. In 1914, King Carol I died, and his nephew, Ferdinand I, succeeded him on the throne.
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.