Semax Science Bio was a go-to research peptide supplier that has since shut down. Here's what Semax is, how researchers source it now, and key safety facts.
Science.bio was a US research chemical supplier that stocked Semax, a synthetic peptide, as a laboratory reference material. The company has since discontinued operations, so Semax from Science.bio is no longer available to buy. Semax is not FDA-approved for human use and is sold elsewhere only for research purposes.
What Semax Actually Is
Semax is a synthetic seven-amino-acid peptide modeled on ACTH(4-10), a fragment of adrenocorticotropic hormone. Russian researchers developed it in the 1980s, and it is registered in Russia as a prescription nasal drop for stroke, transient ischemic attack, and optic nerve conditions.
In Western labs, Semax is studied for its effects on BDNF and NGF expression, attention, and memory-related signaling in animal and cell models. Human data collected outside Russia remains limited.
Two facts are worth stating plainly: Semax is a synthetic peptide analog of ACTH(4-10), not a hormone replacement or a dietary supplement. Semax is approved as a prescription drug in Russia but has never been approved by the FDA for any human use in the United States.
Why "Science Bio" and Semax Show Up Together
Science.bio built a reputation among researchers for publishing third-party certificates of analysis and shipping domestically within the US. Its Semax listings became a common reference point in nootropics and peptide forums, which is why searches for the two terms are still linked.
Much of that discussion now lives in archived threads that surface under science bio semax reddit searches. Those threads are useful for vendor history, but many are outdated — prices, stock status, and even the vendor's existence have changed.
Beware of "Science.bio Semax" Listings Today
Because the brand name still carries recognition, some unrelated sites reuse it in product titles or domain names. A legitimate supplier will show a current certificate of analysis with a batch number, a testing lab you can look up, and HPLC and mass spectrometry data.
Anyone asking what is semax peptide used for should also ask whether the seller can document what is actually inside the vial.
Forms of Semax Researchers Encounter
Semax is distributed in three main formats. Each has different handling requirements and different details worth verifying before use.
| Form | Typical research handling | What to verify |
|---|---|---|
| Lyophilized powder in sealed vials | Stored cold and reconstituted with bacteriostatic water before use | Peptide content per vial, purity percentage, batch COA |
| Pre-mixed nasal spray | Used as supplied; no reconstitution step | Sterility, stated concentration, expiration date |
| Selank and Semax combination vials | Reconstituted like single-peptide powder | Identity and purity of each peptide separately |
Standard guidance on how to reconstitute semax calls for adding bacteriostatic water slowly down the vial wall and swirling rather than shaking. Shaking can damage peptide structure, and reconstituted solutions are typically refrigerated and used within a defined window.
A selank semax blend contains two different Russian-developed peptides in one vial. Blends are harder to verify than single peptides because a lab report should confirm both identities, not just total mass.
How Semax Compares With Other Popular Peptides
Researchers who look at Semax usually compare it against a small group of related compounds. The table below summarizes the standard differences.
| Peptide | Origin | Main research focus | Regulatory status (US) |
|---|---|---|---|
| Semax | Synthetic ACTH(4-10) analog, Russia | Cognition, neuroprotection, BDNF/NGF signaling | Not FDA-approved |
| Selank | Synthetic tuftsin analog, Russia | Anxiety-related pathways, immune signaling | Not FDA-approved |
| Dihexa | Angiotensin IV-derived analog | Synaptogenesis, HGF/c-Met signaling | Not FDA-approved |
| BPC-157 | Gastric pentadecapeptide | Tissue repair models | Not FDA-approved |
Dihexa and Semax are not interchangeable: Dihexa is an angiotensin-derived compound studied for synapse formation, while Semax is an ACTH-derived peptide studied mainly for neurotrophic signaling.
Side Effects, Safety, and Legal Status
Reported semax nasal spray side effects in Russian clinical literature are generally described as mild — nasal irritation, headache, and occasional sleep changes. Even so, long-term human safety data from outside Russia is thin, and dosing in a laboratory setting is not the same as dosing in a clinic.
- Semax is not FDA-approved and is not a lawful ingredient in dietary supplements sold in the US.
- Research chemicals are sold without the purity, sterility, and labeling oversight applied to prescription drugs.
- Self-experimentation carries unknown risks, and anyone considering a peptide for a health reason should talk with a licensed healthcare professional.
Nothing here is a treatment recommendation. Peptides sold as research chemicals are not proven to diagnose, treat, cure, or prevent any disease.
What to Do If You Were Looking for Science.bio Semax
If the goal is simply to locate the product, the practical steps below cover most of the ground.
- Confirm whether the vendor still operates before sending payment — several once-popular suppliers have closed.
- Request a batch-specific COA dated within the last year, then confirm the testing lab exists independently.
- Read the product page wording: legitimate research suppliers label items "not for human consumption."
- Skip sellers that reuse a defunct brand's name without explaining the relationship.
There is no way to buy genuine Science.bio Semax today, because the company no longer sells it. Researchers who still work with Semax do so through other suppliers and rely on independent third-party testing to judge quality.
RELATED PEPTIDE TOPICSemaglutide peptideFrequently Asked Questions
Is Semax still available from Science.bio?
No. Science.bio discontinued operations and no longer sells Semax or any other research compound, so any listing claiming to offer Science.bio Semax today is not coming from that company. Researchers looking for the peptide now have to evaluate other suppliers and their certificates of analysis.
Is Semax FDA-approved in the United States?
No. Semax is not FDA-approved for any indication in the US, though it is registered as a prescription nasal drug in Russia for certain neurological conditions. In the US it is treated as a research chemical and is not a permitted dietary supplement ingredient.
What are the reported side effects of Semax nasal spray?
Russian clinical reports describe mostly mild effects such as nasal irritation, headache, and occasional sleep or mood changes. Long-term safety data collected outside Russia is limited, so the risks of repeated use are not well characterized. Anyone considering it for a health purpose should speak with a licensed healthcare professional.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.