Semax FAQ: Your Questions Answered
The questions below are the ones that come up specifically about Semax, rather than general peptide questions that apply to everything.
In plain English
People most often ask why it has that three-amino-acid tail, whether it shares the hormonal effects of ACTH (it does not), and how it differs from Selank.
What Semax actually is
Semax was built in a Moscow laboratory by taking a four-amino-acid piece of ACTH — a stress hormone — and adding a short tail so enzymes could not destroy it within seconds. That piece was chosen specifically because it carries nerve-related properties without the hormonal effects of the full molecule.
Supplied for laboratory research use only — not for human or animal use.
Third-party tested by HPLC and LC-MS, ≥99% purity, with a Certificate of Analysis on every order. Ships across Canada.
Technical detail below
Semax — common questions
Why does Semax include a Pro-Gly-Pro tail?
It is a stability engineering choice. The native ACTH(4-7) fragment is cleared by aminopeptidases almost immediately; appending Pro-Gly-Pro sterically blocks that cleavage and substantially extends the fragment's persistence in biological media. Proline-containing motifs are a standard tool for this because peptidases handle proline bonds poorly.
Is Semax related to ACTH, and does it share ACTH activity?
It is derived from residues 4–7 of ACTH but does not carry the corticotropic activity of the full hormone. The fragment was chosen precisely to separate the neurotropic properties studied in the literature from the endocrine activity of the parent molecule.
How does Semax differ from Selank?
Both are short Russian-developed peptides with Pro-Gly-Pro stabilising motifs, but they descend from different parents — Semax from ACTH, Selank from the immunomodulatory tetrapeptide tuftsin. Their research literatures differ accordingly: neuroprotection and BDNF for Semax, anxiolytic and GABA/serotonin pathways for Selank.
Why is Semax so often studied in a nasal-spray format?
Intranasal delivery is a long-standing route in the published literature for compounds studied in central nervous system models, and the original Russian research programme used it. The nasal-spray research format reflects the route used in those published studies rather than a formulation preference.
Does the small size of Semax affect handling?
Yes, in two practical ways: it dissolves instantly and needs no solvent tricks, and at low fill masses the lyophilized cake may appear as a barely visible film. Neither is a defect.
What Semax is studied for
One of the most-cited research findings is upregulation of brain-derived neurotrophic factor in animal models.
A substantial Russian literature examines the compound in cerebral ischemia models.
Investigated in behavioural models measuring attention and memory consolidation.
The ACTH(4-7) fragment was selected specifically because it lacks the hormonal activity of the full sequence.
Summarizes published preclinical literature. Provided for research reference only; not a claim of efficacy or a description of human use.
More Semax reference
Lyophilized and reconstituted storage conditions, plus the practical working window.
Diluent selection, dissolution behaviour, and the calculator preset for this compound.
Which solvents work, why, and what abnormal dissolution behaviour indicates.
The specific chemical routes by which this molecule breaks down, and how to limit each.
Which assays are informative for this molecule, and what to actually check on its COA.
Compound-specific bench practices, and the errors most often made with this molecule.
What to inspect on arrival, and which conditions actually warrant rejecting a vial.
FAQ reference for other compounds
Semax is supplied strictly as a research chemical for in-vitro laboratory and research use only. It is not intended for human or animal consumption, diagnostic, or therapeutic use. This page is educational laboratory-handling reference information — not medical advice, not usage guidance, and not a protocol.