Everything below concerns Pro-Gly-Pro tail. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-04-10. 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.
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.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It was derived from the ACTH(4-10) fragment, a short segment of adrenocorticotropic hormone that lacks the hormonal activity associated with the full-length peptide. Researchers at the Institute of Molecular Genetics in Moscow developed the compound during the 1980s. It has been registered as a pharmaceutical product in Russia and several neighbouring countries, where it is supplied as a nasal solution, and it is also sold internationally as a research chemical.
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.
| 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 |
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 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.
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.
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Teva Pharmaceutical Industries Ltd. (also known as Teva Pharmaceuticals) is an Israeli multinational pharmaceutical company. Teva specializes primarily in generic drugs, but other business interests include branded-drugs, active pharmaceutical ingredients (APIs) and, to a lesser extent, contract manufacturing services and an out-licensing platform. Teva's primary branded products include Austedo (deutetrabenazine) which is used for the treatment of chorea associated with Huntington's disease and tardive dyskinesia; and Ajovy (fremanezumab), used for the preventive treatment of migraine in adults. Additional branded drugs sold by Teva include Copaxone, Bendeka and Treanda, all of which are primarily sold in the United States. Teva is listed on the Tel Aviv Stock Exchange and the New York Stock Exchange. Its manufacturing facilities are located in Israel, North America, Europe, Australia, and South America. The company is a member of the Pharmaceutical Research and Manufacturers of America (PhRMA). Teva Pharmaceuticals is the largest generic drug manufacturer in the world. Overall, Teva is the 26th largest pharmaceutical company in the world. Teva has a history of legal trouble in relation to collusion and price-fixing to inflate prices for drugs. In 2023, Teva paid the largest fine to date for a domestic antitrust cartel in relation to a criminal investigation by the US Department of Justice into the company's price-fixing. One of its early shareholders, after the company was quoted on the Tel Aviv exchange, was the late British press tycoon Robert Maxwell.
== Preparation == The compound is prepared by reacting 4-tert-butylbenzoic methyl ester (from 4-tert-butylbenzoic acid by esterification with methanol) with 4-methoxyacetophenone in toluene in the presence of sodium amide via Claisen condensation.
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Sources: en.wikipedia.org
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I have been frequently asked why I invented the name "Penicillin". I simply followed perfectly orthodox lines and coined a word which explained that the substance penicillin was derived from a plant of the genus Penicillium just as many years ago the word "Digitalin" was invented for a substance derived from the plant Digitalis. For the effect on the cultures of staphylococci that Fleming observed, the mould had to be growing before the bacteria began to grow, because penicillin is only effective on bacteria when they are reproducing. Fortuitously, the temperature in the laboratory during that August was optimum first for the growth of the mould, below 20 °C (68 °F), and later in the month for the bacteria, when it reached 25 °C (77 °F). Had Fleming not left the cultures on his laboratory bench and put them in an incubator, the phenomenon would not have occurred. Fleming had no training in chemistry; he left all the chemical work to Craddock, once remarking "I am a bacteriologist, not a chemist." In January 1929, he recruited Frederick Ridley, his former research scholar who had studied biochemistry, specifically to study the chemical properties of the mould. But they could not isolate penicillin, and before the experiments were over, Craddock and Ridley both left Fleming for other jobs. It was due to his failure to isolate the compound that Fleming practically abandoned further research on the chemical aspects of penicillin.
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Ian McCartney, Labour Party chairman at the time, said Galloway was the only Labour MP who "incited foreign forces to rise up against British troops". Tony Benn questioned why Galloway strove to remain in the Labour Party despite calling its leadership a "blood-splattered, lying, crooked group of war criminals". Benn added, "It put me off George Galloway in a fairly fundamental way". Following the 7 July 2005 London bombings, which killed 52 civilians, Galloway linked the attack to Western policies in the Middle East. He said Tony Blair and George W. Bush had "far more blood on their hands" than the terrorists who carried out the bombings, and called President Bush the world's "biggest terrorist".
Sources: en.wikipedia.org
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== Adverse effects == Adverse effects from sitagliptin are similar to placebo, except for rare nausea, common cold-like symptoms, and photosensitivity. It does not increase the risk of diarrhea. No significant difference exists in the occurrence of hypoglycemia between placebo and sitagliptin. In those taking sulphonylureas, the risk of low blood sugar is increased. The existence of rare case reports of kidney failure and hypersensitivity reactions is noted in the United States prescribing information, but a causative role for sitagliptin has not been established. Several postmarketing reports of pancreatitis (some fatal) have been made in people treated with sitagliptin and other DPP-4 inhibitors, and the US FDA package insert carries a warning to this effect, although the causal link between sitagliptin and pancreatitis has not yet been fully substantiated. One study with lab rats published in 2009 concluded that some of the possible risks of pancreatitis or pancreatic cancer may be reduced when it is used with metformin. However, while DPP-4 inhibitors showed an increase in such risk factors, as of 2009, no increase in pancreatic cancer has been reported in individuals taking DPP-4 inhibitors. In 2015, the US Food and Drug Administration (FDA) added a new warning and precaution about the risk of "severe and disabling" joint pain to the labels of all DPP-4 inhibitor medicines.
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.
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.