Explore BioBoost LabsSemax
A synthetic seven-amino-acid peptide based on a short fragment of the hormone ACTH, studied mainly within Russian neuroscience research.
What the name means
“Semax” is a coined laboratory name rather than an acronym with an agreed public decoding.
What it does encode is chemical lineage: the molecule is built around the fourth-through-seventh amino acids of adrenocorticotropic hormone (ACTH), so it is frequently written as an ACTH(4–7) analog with a short stabilising tail attached.
What it actually is
Semax is a synthetic heptapeptide — seven amino acids joined by six peptide bonds, in a single linear chain with no disulfide bridge.
The commonly reported sequence is Met-Glu-His-Phe-Pro-Gly-Pro (MEHFPGP): the ACTH(4–7) core Met-Glu-His-Phe followed by a Pro-Gly-Pro tail. Reference databases list a molecular formula of C₃₇H₅₁N₉O₁₀S (the sulfur comes from the methionine) and a mass near 814 g/mol.
Where it came from
Semax was developed in the Soviet Union and later Russia, and is commonly attributed to researchers associated with the Institute of Molecular Genetics of the Russian Academy of Sciences and Moscow State University.
It grew out of a long line of Soviet-era work on ACTH-derived peptides and their effects on learning and attention. It has been registered for clinical use inside Russia, which is an important context point: its footprint is largely regional rather than reflecting broad international approval.
Why it was created — the thought process
The starting observation was that fragments of ACTH could influence attention and memory in animal studies without driving the hormone’s downstream steroid effects.
The natural neuroactive fragment ACTH(4–10) is broken down quickly by peptidases. The design logic was to keep the smallest active core (residues 4–7) and bolt on a Pro-Gly-Pro tail — a motif chosen to slow enzymatic degradation and lengthen the peptide’s working lifetime.
How it is made
As a short peptide, Semax is produced by solid-phase peptide synthesis (SPPS).
The chain is assembled one amino acid at a time on a resin, cleaved, then purified by high-performance liquid chromatography (HPLC) with identity confirmed by mass spectrometry. In the Russian research and clinical setting it is commonly prepared as an intranasal solution.
What the research actually shows — honestly
Most of the human data on Semax comes from Russian studies and is not widely replicated by independent groups internationally.
Mechanistic work — reported effects on BDNF expression and on dopaminergic and serotonergic signalling — is largely preclinical and rodent-based. Semax is used within Russia but has not been approved by the FDA or EMA, and large independent trials establishing efficacy and long-term safety are lacking.
For the purposes of this log it is a research compound, not a medicine. Nothing here is medical advice, and no dosing or administration guidance is given.
Selected research & sources
The items below are drawn from the peer-reviewed literature (PubMed) and describe results observed in research models or reported in the clinical literature. They are listed so the evidence can be examined at its source — not to suggest any use.
- Dolotov OV, et al. Brain Res. 2006. “Semax… regulates BDNF and trkB expression in the rat hippocampus.” doi.org/10.1016/j.brainres.2006.07.108
- Dolotov OV, et al. J Neurochem. 2006. “Semax… increases BDNF in rat basal forebrain.” doi.org/10.1111/j.1471-4159.2006.03658.x
- Glazova NY, et al. Neuropeptides. 2020. “Semax attenuates alterations following early-life fluvoxamine exposure.” doi.org/10.1016/j.npep.2020.102114
- Tabbì G, et al. J Inorg Biochem. 2014. “Semax… high affinity for copper(II) and protection against metal toxicity.” doi.org/10.1016/j.jinorgbio.2014.09.008
- Vanhee C, et al. Drug Test Anal. 2020. “Putative cognitive-enhancing research peptides in seized preparations.” doi.org/10.1002/dta.2717
Regulatory status: Not FDA-approved. Semax is a research compound in Western markets; note that it (with Selank) has appeared in analytical surveys of illegally sold “cognitive-enhancing” peptides [5] — keep positioning strictly research-framed and de-hyped.
◆ A reference, not a recommendation
This page explains what Semax is and where it came from — the science and the story — not who should use anything, or how. These are research materials for laboratory research only; nothing here is medical, dosing, or treatment advice.
Research-use-only educational content. Factual overview; claims of clinical benefit are not implied.