A practical reference on heptapeptide: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-10-11 and is reviewed periodically as new material appears.
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.
Clinical evidence consists largely of small trials with modest sample sizes, often without independent replication. Reported endpoints include cognitive scores, recovery after stroke, and visual function, but study designs vary widely and few trials meet contemporary reporting standards. Systematic reviewers have noted a high risk of bias in several of these reports. No large multicenter trial conducted outside Russia has been published. The compound is therefore best described as investigational in most jurisdictions, with its clinical role still unresolved.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its chain combines the first seven residues of corticotropin with a C-terminal proline-glycine-proline extension, a modification intended to slow enzymatic breakdown. The free peptide has a molecular mass near 813.9 daltons. It belongs to the class of ACTH-derived fragments studied for central nervous system activity rather than for adrenal steroid stimulation. This structural relationship to a natural hormone fragment is the usual starting point for describing the compound in the literature.
| Property | Value | Notes |
|---|---|---|
| Purity assay | RP-HPLC, UV 214 nm | Typical research grade 95 percent or higher |
| Mass confirmation | ESI-MS or MALDI-TOF | Compared with theoretical value |
| Main degradation route | Methionine oxidation | Sulfoxide formation in solution |
| Powder storage | -20 °C, desiccated | Amber vial, minimal headspace |
| Working solution | Sterile water or saline | Prepare fresh; avoid repeated thawing |
Material sold for laboratory use varies widely in stated purity and documentation. A certificate of analysis should list the analytical method, the column and detector used, and the observed purity value. Independent verification by an outside laboratory is the practical way to confirm identity when documentation is absent or internally inconsistent. Regulatory status differs by country, and a product legal in one jurisdiction may be unapproved or controlled in another.
Identity and purity of semax are established with reversed-phase high-performance liquid chromatography coupled to ultraviolet detection, usually at 214 nanometres. Mass spectrometry, most often electrospray ionisation in positive mode, confirms the molecular mass and reveals truncated sequences. Amino acid analysis and peptide mapping after enzymatic digestion provide additional structural confirmation. Laboratories typically report purity as the percentage area of the main peak, a figure that does not capture isomeric or oxidised variants unless the method resolves them.
The peptide is prone to several degradation pathways. Oxidation of the methionine residue produces a sulfoxide that elutes close to the parent peak in many chromatographic systems. Hydrolysis of peptide bonds and deamidation of susceptible residues in related sequences also reduce purity over time. Lyophilised material kept dry at minus twenty degrees Celsius and shielded from light is the most stable form commonly described in laboratory practice.
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.
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.
=== Pretreatment === Pretreatment includes any method of treating the product prior to freezing. This may include concentrating the product, formulation revision (i.e., addition of components to increase stability, preserve appearance, and/or improve processing), decreasing a high-vapor-pressure solvent, or increasing the surface area. Food pieces are often IQF treated to make them free flowing prior to freeze drying. Freeze dried pharmaceutical products are in most cases parenterals administered after reconstitution by injection which need to be sterile as well as free of impurity particles. Pre-treatment in these cases consists of solution preparation followed by a multi-step filtration. Afterwards the liquid is filled under sterile conditions into the final containers which in production scale freeze dryers are loaded automatically to the shelves. In many instances the decision to pretreat a product is based on theoretical knowledge of freeze-drying and its requirements, or is demanded by cycle time or product quality considerations.
== Deficiency == Pantothenic acid deficiency in humans is very rare and has not been thoroughly studied. In the few cases where deficiency has been seen (prisoners of war during World War II, victims of starvation, or limited volunteer trials), nearly all symptoms were reversed with orally administered pantothenic acid. Symptoms of deficiency are similar to other vitamin B deficiencies. There is impaired energy production, due to low CoA levels, which could cause symptoms of irritability, fatigue, and apathy. Acetylcholine synthesis is also impaired; therefore, neurological symptoms can also appear in deficiency; they include sensation of numbness or burning in hands and feet, paresthesia and muscle cramps. Additional symptoms could include restlessness, malaise, sleep disturbances, nausea, vomiting and abdominal cramps. In animals, symptoms include disorders of the nervous, gastrointestinal, and immune systems, reduced growth rate, decreased food intake, skin lesions and changes in hair coat, and alterations in lipid and carbohydrate metabolism. In rodents, there can be loss of hair color, which led to marketing of pantothenic acid as a dietary supplement which could prevent or treat graying of hair in humans (despite the lack of any human trial evidence). Pantothenic acid status can be assessed by measuring either whole blood concentration or 24-hour urinary excretion. In humans, whole blood values less than 1 μmol/L are considered low, as is urinary excretion of less than 4.56 mmol/day.
== Corporate structure == In the financial year 2023, Basilea Pharmaceutica AG, Allschwil generated company sales of CHF 157.6 million and employed 147 people. Since the 2022 financial year, Basilea has consistently been generating operating and net profits. In addition to its headquarters in Allschwil, Switzerland, Basilea is represented by subsidiaries in the UK and Germany. Basilea cooperates with licence and distribution partners in over 100 countries.
== Pharmacological properties == Isoliquiritigenin has been studied for its potential pharmacological properties, and ongoing research is exploring its use in food additives and therapeutic applications, although further studies are needed to evaluate its safety and potential target-organ toxicity. It is also under preliminary research for potential anti-inflammatory effects through multiple molecular pathways. It has been studied for its effects on melanoma cells, where it was found to modulate microRNA-301b and its target gene LRIG1 in experimental models. It is under preliminary research for potential therapeutic effects against age-related neurodegenerative diseases by targeting multiple pathological mechanisms such as oxidative stress, neurotransmitter imbalance, and mitochondrial dysfunction.
=== Fluorometric === Fluorescence is when a molecule emits light of one wavelength after absorbing light of a different wavelength. Fluorometric assays use a difference in the fluorescence of substrate from product to measure the enzyme reaction. These assays are in general much more sensitive than spectrophotometric assays, but can suffer from interference caused by impurities and the instability of many fluorescent compounds when exposed to light. An example of these assays is again the use of the nucleotide coenzymes NADH and NADPH. Here, the reduced forms are fluorescent and the oxidised forms non-fluorescent. Oxidation reactions can therefore be followed by a decrease in fluorescence and reduction reactions by an increase. Synthetic substrates that release a fluorescent dye in an enzyme-catalyzed reaction are also available, such as 4-methylumbelliferyl-β-D-galactoside for assaying β-galactosidase or 4-methylumbelliferyl-butyrate for assaying Candida rugosa lipase.
Sources: en.wikipedia.org
=== Tracking selection progression === To track the progress of a SELEX reaction, the number of target bound molecules, which is equivalent to the number of oligonucleotides eluted, can be compared to the estimated total input of oligonucleotides following elution at each round. The number of eluted oligonucleotides can be estimated through elution concentration estimations via 260 nm wavelength absorbance or fluorescent labeling of oligonucleotides. As the SELEX reaction approaches completion, the fraction of the oligonucleotide library that binds target approaches 100%, such that the number of eluted molecules approaches the total oligonucleotide input estimate, but may converge at a lower number.
==== Amino acids ==== The lack of readily available glucose from the limited carbohydrates in the diet has resulted in the liver adapting to produce glucose from the breakdown components of protein — amino acids. The enzymes that break down amino acids are constantly active in cats. Thus, cats need a constant source of protein in their diet. Because they are constantly growing, kittens require an increased amount of protein to supply readily available amino acids for daily maintenance and for building new body components. There are many required amino acids for kittens. A dietary level of approximately 0.3% histidine is necessary for kittens since histidine-free diets cause weight loss. Tryptophan is required at about 0.15% as this level maximizes performance in kittens. Kittens also need the following amino acids supplemented in their diet: arginine to avoid an excess of ammonia in the blood — otherwise known as hyperammonemia, isoleucine, leucine, valine, lysine, methionine as a sulfur-containing amino acid, asparagine for maximal growth in the early post-weaning kitten, threonine, and taurine to prevent central retinal degeneration.
In February 1983 he fell over in the melée (he said at the time that he was pushed) when CND protestors surrounded a meeting of Newbury Conservatives, a propaganda gift, and on Good Friday 1983 he was filmed in West Berlin looking over the wall to the communist east, distracting attention from CND's linking of arms round Greenham Common that day. With a general election looming, Heseltine was keen to associate Labour with CND, and CND with communists and the Soviet Union (ignoring earlier comments by Party Chairman Cecil Parkinson that this was "manifest nonsense" – the media did not pick up on this). He made such a claim in a speech at Exeter in April 1983, and distributed to Tory candidates information about the background of leading members of CND. This had been assembled by Ray Whitney MP, but some of it was suspected of having come from intelligence sources. MI5 agent Cathy Massiter later wrote, in 1985 in The Observer, that from 1981 onwards and especially from 1983 she had been asked to pass on to DS19 (the propaganda unit at the Ministry of Defence) information obtained by wiretaps and by an MI5 mole in CID. MI5 bosses refused to pass on classified material about security matters but agreed to pass on information about the political links of CND members. Even this was in breach of the 1952 Directive from Home Secretary David Maxwell-Fyfe that the security services not provide information for party political purposes.
=== Environmental impact === When compared to the extraction of other proteins such as whey and soy, the production of pea protein utilises fewer resources which can impact the environment, such as the use of water and fertilizers. Pea proteins require less water in their production and extraction process, making pea proteins a more environmentally sustainable food source than its counterparts. One study found that one kilogram of animal protein can only be obtained by feeding six kilograms of plant protein. Another study found that the water footprint per gram of protein for eggs, chicken meat, and milk is 1.5 times larger than for peas. In the case of beef, the water footprint per gram of protein is six times larger than for peas.
Other researchers of the entities seemingly encountered by DMT users describe them as "entities" or "beings" in humanoid as well as animal form, with descriptions of "little people" being common (non-human gnomes, elves, imps, etc.). Strassman and others have speculated that this form of hallucination may be the cause of alien abduction and extraterrestrial encounter experiences, which may occur through endogenously-occurring DMT. Likening them to descriptions of rattling and chattering auditory phenomena described in encounters with the Hayyoth in the Book of Ezekiel, Rick Strassman notes that participants in his studies, when reporting encounters with the alleged entities, have also described loud auditory hallucinations, such as one subject reporting typically "the elves laughing or talking at high volume, chattering, twittering". Researchers such as Robin Carhart-Harris and David E. Nichols among others believe that DMT entities are merely illusions and hallucinations. However, Andrew Gallimore believes that entity encounters are real and genuine interactions with other-dimensional beings. Neurocomputational models of entity encounters have been proposed, for instance by Carhart-Harris and colleagues.
Sources: en.wikipedia.org
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.
The main chemical risks are methionine oxidation and backbone hydrolysis in solution. Moisture and repeated temperature cycling accelerate both processes. Dry powder held cold and desiccated is considerably more stable than any reconstituted preparation.
It holds a medicine registration in Russia, where it has been used clinically for decades. In most other countries it is treated as a research chemical. That split explains the uneven distribution of clinical literature.
Semax is a synthetic seven-amino-acid peptide derived from a fragment of corticotropin. It is used in Russia as a nasal preparation, while elsewhere it is studied as a research compound. It is not approved as a medicine in most countries.