Semax: what the research shows
A Russian nasal-spray peptide used after strokes and studied as a “brain booster”.
At a glance
Registered as a medicine in Russia, where it is used after strokes and for some other brain conditions. Not approved in the US, UK or EU.
What is Semax?
Semax is a lab-made fragment of ACTH, a hormone from the pituitary gland, with a short tail added so it lasts longer. It doesn’t have ACTH’s hormone effects.
How does Semax work?
It is thought to raise levels of BDNF, a protein that helps brain cells survive and form new connections.
What does the research show?
- Russian studies in stroke patients report better recovery when Semax is added to standard care, for example a 2018 study.
- FDA advisers reviewed it in July 2026 as a possible compounding ingredient for stroke-related conditions and migraine.
Known risks and side effects
- Most evidence comes from small studies in one country. Long-term safety and benefit are not established.
Is Semax approved?
Approved as a medicine in some countries, but not in the US, UK or EU.
Registered as a medicine in Russia, where it is used after strokes and for some other brain conditions. Not approved in the US, UK or EU.
From the community
Watch: Semax and related science
Start with the compound discussion, then use the background lesson to understand its biology. Each card explains its connection. Recordings may predate later findings or regulatory changes.
U.S. Food and Drug Administration
FDA peptide compounding meeting: July 24, 2026
Full meeting covering DSIP (emideltide), Semax and Epitalon. Advisory discussion is not drug approval.
Official FDA advisory committee recording
Official regulatory recording
The original July 24, 2026 FDA discussion of DSIP, Semax and Epitalon; it documents an advisory review.
khanacademymedicine
Types of neurotransmitters
The roles of signalling molecules such as GABA, glutamate and peptide neurotransmitters.
Khan Academy · nervous-system physiology
Related biology
Background on neurotransmitter biology for understanding Semax. It does not demonstrate benefits of this compound or formulation.
National Institute of Mental Health
Different types of clinical research
An introduction to the different questions and designs used in studies involving people.
NIMH · US National Institutes of Health
Research skills
Helps you judge the study design or uncertainty in Semax research; it is not a trial of the compound.
Sources and references
- The efficacy of Semax in the treatment of patients at different stages of ischemic stroke (in Russian)Gusev et al. · Zhurnal Nevrologii i Psikhiatrii · 2018
- FDA Pharmacy Compounding Advisory Committee, July 23–24, 2026US Food and Drug Administration · meeting page
VETUD Learn explains published research in plain language. It is general information, not medical advice. Talk to a doctor before starting, stopping or changing any treatment.
In the research shop
Check the catalog for related laboratory research materials. These products are separate from the approved medicines and clinical trial formulations discussed here.
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