Semax (5mg)

What Is Semax?

Semax is a synthetic heptapeptide derived from the ACTH(4–10) fragment of adrenocorticotropic hormone (ACTH), with an additional C-terminal Pro-Gly-Pro sequence. This structure makes Semax a subject of research in neuroscience, neurotrophin regulation, neuronal signalling, BDNF–TrkB pathway activity and the molecular mechanisms underlying cellular responses in the nervous system.

Research has investigated Semax in cellular and animal models, including studies examining the expression of brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF). These findings have generated interest in its molecular interactions, although its complete mechanism of action is not yet fully understood.

When you buy Semax 5mg vials from Crystal Peptides Europe, you’re getting high-purity research material tested by third-party labs to verify identity, purity and other applicable quality parameters, with a Certificate of Analysis (CoA) available for every batch. Semax is sold exclusively for laboratory research and is not for human or veterinary use. Secure and discreet delivery available across the UK/EU and worldwide.

What’s Included?

Semax 5mg is a research peptide supplied as a lyophilised powder in sealed glass vials to help maintain stability during shipping and storage. The material is typically white to off-white in appearance and can be reconstituted into a liquid solution using appropriate laboratory diluents.

Crystal Peptides also provides Certificates of Analysis from recognised labs, usually Janoshik, to help verify product identity and quality. CoAs for every batch can be found on the relevant product page and on the Lab Tests page and may include results for analytical tests such as:

• Identity testing: Confirms that the material corresponds to the intended Semax peptide.
• Purity testing: Measures the proportion of the principal peptide component relative to detectable chromatographic impurities.
• Endotoxin testing: Assesses bacterial endotoxin levels under the stated test conditions.
• Sterility testing: Evaluates the sample for detectable microbial growth using the specified method.
• Heavy metals testing: Screens for specified elemental contaminants.

Please note that testing methods and reported parameters may vary between batches and laboratories. Reconstitution solution is not included, but you can order Bac Water (10mL) or Acetic Acid 0.6% Mixing Water separately, to be delivered together. Orders above €200 are delivered free of charge as per standard delivery rates.

Semax 5mg: Technical Specifications

Note: Molecular identifiers and structural specifications apply to the defined Semax molecular form. For exact specifications, consult the batch CoA to confirm the sequence, terminal modifications and any counter-ion or salt form of the supplied material.

Overview and Mechanism of Action

Semax is a synthetic heptapeptide developed through research into the neurological activity of adrenocorticotropic hormone (ACTH) fragments, as researchers sought to investigate the effects of these fragments independently of ACTH's principal hormonal functions.

The resulting molecule, often described as an ACTH(4–10) analogue, contains the C-terminal sequence Pro-Gly-Pro and is still being investigated as a means of improving resistance to enzymatic degradation. Semax subsequently became the subject of research into neurotrophin regulation, neuronal signalling and cellular responses in the nervous system.

Unlike native ACTH, which acts through melanocortin receptors to regulate endocrine functions, Semax has been investigated primarily for its potential effects on neurological pathways. Some research studies have examined changes in brain-derived neurotrophic factor (BDNF) expression and related TrkB signalling, alongside other molecular responses in cellular and animal models.

Please note that, although these findings provide useful directions for further investigation, Semax's complete mechanism of action is not fully understood, and the referenced results from preclinical studies should not be interpreted as proof of equivalent effects in humans.

BDNF–TrkB Signalling

One area of research concerns brain-derived neurotrophic factor (BDNF), a protein involved in neuronal survival, synaptic plasticity and the regulation of neural connections. BDNF activates tropomyosin receptor kinase B (TrkB), initiating intracellular signalling pathways that influence neuronal function.

In animal studies, Semax exposure has been associated with changes in BDNF expression and TrkB phosphorylation in the hippocampus, a brain region involved in learning and memory. These findings have prompted further investigation into whether Semax influences neurotrophin-related signalling. However, observations in animal models do not establish equivalent effects in humans.[1][2]

Neurotrophin Gene Expression

Research has also examined the relationship between Semax and the expression of neurotrophins, including BDNF and nerve growth factor (NGF). These proteins participate in cellular processes associated with neuronal maintenance, development and responses to environmental stimuli.

For instance, experiments involving cultured glial cells and animal models have reported changes in neurotrophin gene expression following Semax exposure. [3] Such findings provide a basis for investigating the peptide's effects on cellular signalling and gene regulation, although the underlying molecular interactions are not fully characterised.

Molecular Interactions and Signalling Pathways

Additional research has investigated Semax binding interactions and its effects on molecular processes within neural tissue. These studies aim to clarify how the peptide interacts with biological systems and whether the reported changes in neurotrophin expression are direct or indirect consequences of its activity. [4]

The evidence does not yet establish a comprehensive mechanism linking Semax exposure to all reported biological outcomes. Although Semax provides a subject for research into neurotrophin regulation and neuronal signalling, its proposed mechanisms should be interpreted in the context of the available experimental evidence, much of which remains preclinical.

Semax Research Applications

Semax has been investigated in several areas of neuroscience, with research focusing on neurotrophin regulation, neuronal signalling and molecular responses in the central nervous system. Much of the evidence cited here comes from cell-culture experiments and animal models, so the findings are merely observations that should be interpreted according to the experimental conditions and the specific outcomes measured.

Neurotrophin Regulation and Gene Expression

One of the principal research areas involving Semax is the regulation of neurotrophins, including brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF). These proteins participate in neuronal maintenance, cellular signalling and the formation and modification of neural connections.

Studies involving cultured glial cells and rat brain tissue have investigated changes in BDNF and NGF gene expression following Semax exposure. This research provides a basis for examining how the peptide may influence neurotrophin-related processes and whether the observed responses differ between cell types or regions of the brain. [3]

BDNF–TrkB Signalling

The BDNF–TrkB pathway is another area of interest. BDNF binds to the TrkB receptor, activating intracellular signalling cascades involved in neuronal function and synaptic plasticity.

A 2006 study published in Brain Research examined Semax in rats and reported changes in hippocampal BDNF levels, TrkB phosphorylation and the expression of associated genes. [5] These findings have informed further investigation into the relationship between Semax and neurotrophin signalling, but they do not establish that Semax directly activates TrkB or produces equivalent effects in humans.

Neuronal and Glial Cell Research

Glial cells support neuronal function and participate in the regulation of neurotrophins and other signalling molecules. Cell-culture studies have investigated whether Semax influences gene expression in these cells, providing a controlled setting for examining molecular responses independently of the complexity of an intact nervous system.

Such models can help researchers investigate concentration-dependent effects, cellular responses and potential differences between experimental systems. Findings from cultured cells nevertheless require careful interpretation, as they may not reproduce the interactions occurring within living neural tissue. [3]

Neurochemical and Molecular Signalling

Research has also explored the molecular interactions associated with Semax and the signalling changes observed in experimental neural systems. This includes investigating possible relationships between peptide exposure, gene regulation and changes in proteins involved in neuronal activity.

The precise mechanisms linking these observations remain uncertain. Further research is needed to distinguish direct molecular interactions from downstream effects and to establish which findings can be reproduced across independent experimental models.

Peptide Stability and Analytical Characterisation

Like other research peptides supplied by Crystal Peptides, Semax is produced under strict manufacturing controls and analytical verification to support consistent quality between batches. Solid-phase peptide synthesis (SPPS) is a widely used method for producing synthetic peptides, assembling amino acids sequentially to form a defined molecular chain. Subsequent cleavage, purification and quality-control procedures help minimise synthesis-related impurities and verify the characteristics of the resulting material.

Independent analytical testing provides further information about peptide identity and purity. For example, high-performance liquid chromatography (HPLC) separates components within a sample to assess chromatographic purity, while mass spectrometry (MS) helps confirm molecular identity by measuring mass-to-charge ratios. Together, these techniques provide complementary evidence about a peptide's composition and help researchers evaluate the consistency of materials used across experiments.

However, purity and identity results do not establish biological activity, guarantee a particular experimental outcome or independently demonstrate long-term stability. Researchers should interpret analytical findings in light of the methods used, the specific batch tested and the requirements of their experimental model.

Semax vs Selank vs DSIP Comparison

Semax, Selank and delta sleep-inducing peptide (DSIP) are synthetic peptides investigated in neuroscience, but they differ in sequence, structure and research focus. Semax is derived from an ACTH fragment, Selank is based on tuftsin, and DSIP is a nonapeptide originally identified in research examining sleep-related processes.

Researchers investigating related neurological pathways may also wish to explore other compounds studied in neuroscience. These include Pinealon, which has been examined in experimental research on neuronal function and gene expression, and Oxytocin, which is widely studied in social behaviour, stress responses and neuroendocrine signalling

These compounds have distinct molecular structures and research backgrounds, so their relevance depends on the biological question being investigated.

Semax Storage and Handling

Semax 5mg is supplied as a lyophilised powder, which means appropriate storage and handling is important for maintaining material integrity during laboratory research. Storage conditions should follow the manufacturer's product documentation, as stability can depend on temperature, moisture exposure, packaging and the specific formulation.

• Protect from moisture: Keep the vial properly sealed and minimise exposure to humid air, which can affect the integrity of lyophilised materials.
• Avoid excessive heat and light: Store the product under the conditions specified by the manufacturer and protect it from unnecessary environmental exposure.
• Follow documented temperature requirements: Store and handle only under the conditions stated on the product label, batch CoA and SDS.
• Maintain product identification: Keep the original label and batch information with the vial to preserve traceability.

Handle Semax using appropriate laboratory procedures and personal protective equipment, following the relevant safety data sheet (SDS) and institutional risk assessment. Avoid unnecessary transfers or prolonged exposure to environmental conditions that may compromise sample integrity.

If the material is prepared as a solution for laboratory use, its stability may differ from that of the original lyophilised powder. Avoid repeated freeze-thaw cycles where possible, and consider preparing appropriately sized aliquots with clear labelling. Follow the applicable laboratory protocol for storage, handling and stability monitoring.

For research reproducibility, record the product batch, storage conditions and relevant handling details. These records can help you assess whether differences in sample history may contribute to variation between experimental results.

Certificate of Analysis and Quality Assurance

A Certificate of Analysis (CoA) provides analytical information about a specific product batch, helping researchers assess whether the material meets its stated specifications. When you buy Semax 5mg vials, the relevant documentation is provided to support the evaluation of molecular identity, chromatographic purity and other quality parameters reported by the testing laboratory.

Crystal Peptides provides independent laboratory testing documentation for Semax. Confirm that the report matches the exact product batch, and examine the reported results alongside the analytical methods and acceptance criteria, where available.

• Identity confirmation: Analytical evidence, such as mass spectrometry, can help establish whether the detected molecular mass is consistent with the intended peptide.
• Chromatographic purity: HPLC results indicate the proportion of the principal detected component under the stated analytical conditions.
• Additional quality parameters: Depending on the batch and testing scope, reports may include results for endotoxins, sterility or specified elemental contaminants.

In addition to the latest batch-specific Certificate of Analysis (CoA) available on the product page, you can review historical testing results on the Crystal Peptides Lab Tests page. Reviewing results across multiple batches can help researchers assess consistency in reported analytical findings over time, providing a broader picture than a single batch report alone.

Frequently Asked Questions About Semax 5mg

1. Where can I buy Semax 5mg in the UK and Europe?

You can buy Semax 5mg from Crystal Peptides Europe, with delivery available anywhere in the UK, Europe and worldwide. Semax research peptide is supplied as a lyophilised powder for laboratory research. Each product batch is tested by independent labs, such as Janoshik, to assess quality parameters such as identity, purity, endotoxins and heavy metals.

For further information about product availability, delivery options, payment methods or purchasing terms, please contact our support team by email or phone to clarify the details you need before placing an order.

2. What Is the Price of Semax 5mg?

If you're looking to buy Semax 5mg in the UK or Europe, Crystal Peptides offers competitive pricing on high-purity research peptides backed by independent laboratory testing. Every batch comes with a Certificate of Analysis (CoA), so you don’t have to commission expensive testing, as the main testing parameters are covered in the report.

Crystal Peptides also offers quantity discounts of up to 20% and free delivery on orders over €200, helping you get more value from your purchase. If you're considering a larger order or need clarification on discounts and delivery, our support team is on hand to help.

3. What is Semax studied for in laboratory research?

Semax has been investigated in neuroscience research involving neurotrophin expression, neuronal signalling and related molecular processes. Studies have examined changes in brain-derived neurotrophic factor (BDNF), nerve growth factor (NGF) and BDNF-associated TrkB signalling in cellular and animal models. These findings remain subject to the limitations of the experimental models and do not establish equivalent effects in humans.

4. What is the amino acid sequence of Semax?

The commonly documented Semax sequence is Met-Glu-His-Phe-Pro-Gly-Pro (MEHFPGP), comprising seven amino acids. It contains the ACTH(4–7) sequence followed by a C-terminal Pro-Gly-Pro extension. Researchers should verify the exact molecular form and sequence against the applicable product specification and batch documentation, particularly when comparing materials from different sources.

5. How does Semax differ from Selank?

Semax and Selank are both synthetic heptapeptides, but their sequences and structural origins differ. Semax is derived from an ACTH fragment, whereas Selank is based on tuftsin. Semax research includes studies of neurotrophin expression and neuronal signalling, while Selank has been investigated in neurotransmission-related and gene-expression research. They are distinct research compounds and should not be treated as interchangeable.

Scientific References

1. Cohen-Cory, S., Kidane, A. H., Shirkey, N. J., & Marshak, S. (2010). Brain-derived neurotrophic factor and the development of structural neuronal connectivity. Developmental Neurobiology, 70(5), 271–288. https://doi.org/10.1002/dneu.20774 PubMed PMC full text
2. Shadrina, M., Kolomin, T., Agapova, T., Agniullin, Y., Shram, S., Slominsky, P., Lymborska, S., & Myasoedov, N. (2010). Comparison of the temporary dynamics of NGF and BDNF gene expression in rat hippocampus, frontal cortex, and retina under Semax action. Journal of Molecular Neuroscience, 41(1), 30–35. https://doi.org/10.1007/s12031-009-9270-z PubMed
3. Shadrina, M. I., Dolotov, O. V., Grivennikov, I. A., Slominsky, P. A., Andreeva, L. A., Inozemtseva, L. S., Limborska, S. A., & Myasoedov, N. F. (2001). Rapid induction of neurotrophin mRNAs in rat glial cell cultures by Semax, an adrenocorticotropic hormone analog. Neuroscience Letters, 308(2), 115–118. https://doi.org/10.1016/S0304-3940(01)01994-2 PubMed
4. Medvedeva, E. V., Dmitrieva, V. G., Povarova, O. V., Limborska, S. A., Skvortsova, V. I., Myasoedov, N. F., & Dergunova, L. V. (2014). The peptide semax affects the expression of genes related to the immune and vascular systems in rat brain focal ischemia: Genome-wide transcriptional analysis. BMC Genomics, 15, 228. https://doi.org/10.1186/1471-2164-15-228 PubMed PMC full text
5. Dolotov, O. V., Karpenko, E. A., Inozemtseva, L. S., Seredenina, T. S., Levitskaya, N. G., Rozyczka, J., Dubynina, E. V., Novosadova, E. V., Andreeva, L. A., Alfeeva, L. Y., Kamensky, A. A., Grivennikov, I. A., Myasoedov, N. F., & Engele, J. (2006). Semax, an analog of ACTH(4–10) with cognitive effects, regulates BDNF and trkB expression in the rat hippocampus. Brain Research, 1117(1), 54–60. https://doi.org/10.1016/j.brainres.2006.07.108 PubMed