How Long Does Semax Last? Shelf Life & Stability
"Stable" is meaningless without saying stable against what. Semax has its own set of degradation routes, and they determine which storage precautions actually matter for it.
In plain English
The vulnerability is light, not time on the shelf. The methionine at the front of the molecule can pick up oxygen, and light speeds that up considerably. Worth knowing: the tail that makes Semax resistant to enzymes does nothing at all against light. Those are separate problems.
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
Degradation routes specific to Semax
- N-terminal methionine oxidation to the sulfoxide — the dominant route, and structurally significant because the N-terminus is the pharmacophore-bearing end.
- Aminopeptidase cleavage in any biological matrix, though the Pro-Gly-Pro tail is specifically designed to slow this.
- Adsorption losses at very dilute working concentrations.
The Pro-Gly-Pro extension protects against enzymatic degradation in biological media. It provides no protection against oxidation in a storage vial — those are different problems with different countermeasures.
Freeze–thaw tolerance
Small peptides tolerate freezing well, but aliquoting remains the better practice because it limits how often the solution meets air.
How storage addresses these routes
Practical window once reconstituted: 2–3 weeks at 2–8 °C. Protect from light — methionine oxidation is photo-accelerated and the N-terminal position is the more exposed one.
Full Semax storage conditionsWhat 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.
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.
Questions specific to this compound — structure, chemistry, and common misconceptions.
Stability 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.