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Cognitive Research

Semax: Research Overview

What is Semax? Semax is a synthetic heptapeptide — a seven-amino-acid chain based on the ACTH(4-7) fragment with a C-terminal Pro-Gly-Pro extension. Developed in Russia, it is studied in preclinical laboratory models of BDNF expression and neuroprotection. It is supplied strictly for laboratory research use.
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Technical profile

CompoundSemax (ACTH(4-7)PGP)
ClassSynthetic heptapeptide (7 amino acids)
SequenceMet-Glu-His-Phe-Pro-Gly-Pro
Sequence originAnalog of the ACTH(4-7) fragment, extended with a C-terminal Pro-Gly-Pro sequence
Molecular weight~813.9 g/mol (approximate)
Origin of developmentDeveloped in Russia; holds regulatory approval there. Not approved by the FDA or EMA
Form suppliedLyophilized powder, sealed vial
StorageLyophilized: 2–8 °C, protected from light.
VerificationHPLC purity ≥99%, sterility, endotoxins, heavy metals — documented on the batch COA

What does the research literature cover?

Much of the published work on Semax originates from Russian research groups, and the bulk of it is preclinical. Cell-culture and animal-model studies have examined the peptide in the context of:

Important context: outside of the Russian regulatory setting, the evidence base is largely preclinical and has not been replicated through large, independent, peer-reviewed clinical programs. Summaries here describe what researchers have studied — they are not claims about effects in humans.

Why purity matters for Semax research

Short peptides are especially sensitive to synthesis artifacts: deletion sequences, incomplete deprotection, and residual counter-ions all shift the mass profile and can confound experimental readouts. Every VP Peptides Semax batch ships with a Certificate of Analysis documenting ≥99% HPLC purity plus sterility, endotoxin and heavy-metal testing from independent third-party testing.

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Frequently asked questions

Is Semax approved by the FDA or EMA?

No. Semax is not approved by the FDA or the EMA for any use. It was developed in Russia and holds regulatory approval in that jurisdiction only; that approval carries no standing in the United States, the European Union, or elsewhere. VP Peptides supplies it strictly as a research chemical for in-vitro and laboratory investigation — not as a drug, supplement, or food ingredient.

What does a Semax Certificate of Analysis include?

Each batch COA documents HPLC purity (≥99% specification), sterility, endotoxin and heavy-metal screening results, along with batch number and test date.

How should Semax be stored in the lab?

Lyophilized vials should be kept at 2–8 °C and protected from light.

How does Semax differ from Selank?

Both are synthetic heptapeptides that pair a short bioactive fragment with a C-terminal Pro-Gly-Pro sequence, and both were developed in Russia. The parent sequences differ: Semax derives from the ACTH(4-7) fragment, while Selank derives from the endogenous tetrapeptide tuftsin. The two are therefore studied in different preclinical model sets.

A closer look at the neurotrophin literature

The neurotrophin strand of Semax research is worth drawing out in more detail, because it is where the peptide's mechanistic studies are most concentrated. In rodent models, the ACTH(4-7) analog has been examined for its association with brain-derived neurotrophic factor (BDNF) and its receptor tyrosine kinase trkB in the hippocampus, with investigators reporting changes in transcript and protein markers of that signalling pair after administration (Dolotov et al., Brain Res 2006). Related work tracked the temporal dynamics of both nerve growth factor (NGF) and BDNF gene expression across hippocampus, frontal cortex, and retina, describing how the measured messenger-RNA levels shift over time in the animal model (Shadrina et al., 2010).

Mechanistically, these studies treat Semax as a tool for probing the neurotrophin system rather than as a finished intervention. The recurring experimental readouts are molecular — messenger-RNA abundance, receptor phosphorylation markers, and tissue-level protein measurements — and the models are cell cultures and laboratory animals subjected to defined conditions such as induced ischemia or hypoxia. The C-terminal Pro-Gly-Pro extension is frequently discussed in the same literature as a stability feature that slows enzymatic breakdown of the parent fragment, which is relevant to how the peptide is handled analytically.

The important caveat is unchanged: this is a preclinical, largely single-region literature. The citations describe what was measured in laboratory systems, not effects of the research material in humans, and Semax carries no FDA or EMA approval regardless of its regulatory status in Russia. Reproducible experiments depend on knowing exactly what is in the vial, which is the role of the batch Certificate of Analysis.

Selected research references

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Research use only. All products described on this page are furnished for laboratory research purposes only and are not for human or veterinary use, not for use in food or cosmetics, and not for any diagnostic or therapeutic application. Nothing on this page is medical advice or a claim of safety or efficacy in humans. Research summaries reference publicly available preclinical literature; specific citations are listed in the references above.