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Brain & focus
Semax: the nasal brain peptide, benefits & research
Research purposes only Checked against official sources Oct 16, 2026
Quick facts
- What it is: a modified piece of the hormone ACTH, usually a nasal spray.
- Status: research purposes only. Not FDA-approved.
- Research: promising early research, including a 110-patient stroke-rehab study.
- Dosage: no established human dose for cognitive use.
- Why it's popular: studied for brain recovery and BDNF, in an easy nasal spray.
What is Semax?
Semax is a lab-made peptide based on a piece of ACTH, a stress hormone, with three extra amino acids added for stability. It's usually used as a nasal spray and marketed online for focus and memory. Most research on it comes from Russia.
Is Semax FDA-approved?
Not FDA-approved. In April 2026 it came off FDA's "significant safety risks" compounding list because the nomination was withdrawn. That is not an approval. In July 2026 FDA's compounding advisory committee narrowly voted to recommend it for the 503A bulks list, against the written advice of FDA staff (FDA advisory committee materials). The vote is non-binding. As of October 16, 2026, it has not been added to the list, and FDA's interim peptide compounding policy is still under White House review.
Semax dosage: what we actually know
There is no FDA-established human dose. What the main human study used:
- The 2018 stroke study (PMID 29798983) gave two 10-day courses of 6,000 µg a day, 20 days apart, in hospital stroke rehab. That's a medical setting, not a focus routine.
- FDA says it has little or no safety information for the routes people use.
Why the numbers online don't agree
- Many online "protocols" are converted from animal studies, where doses are set by body weight in rats or mice. Those don't translate directly to people.
- The few human reports use different routes and settings, with no agreed standard.
- Unregulated products can vary in what they actually contain.
- Sellers and influencers often share numbers without sources.
See Why is peptide info so confusing?
Good questions to bring to a clinician
- What is actually in the product, and has it been third-party tested?
- Is there any human evidence for my specific goal, or only animal studies?
- Could it interact with my other medicines or conditions?
- Is there an FDA-approved option for what I'm trying to treat?
- How would we know if it's working, or causing harm?
What the research shows
- Stroke rehab study (Russian journal, 2018): 110 stroke patients, split by whether they got Semax. The Semax groups had higher BDNF (a brain growth factor) and better daily-function scores. It wasn't described as randomized or blinded.
- Lab and animal studies dominate, mostly on gene activity in rat brains after stroke (2020, 2024).
- We found no large Western randomized trials of Semax for focus or memory in healthy people.
New to these terms? See the glossary.
Semax FAQ
What is the Semax dosage?
There's no FDA-established human dose. The main human study used it in stroke rehab.
Is Semax FDA-approved?
No. An FDA advisory panel narrowly recommended it for a compounding list in July 2026, but FDA hasn't acted and it isn't an approved drug.
Does Semax improve focus?
It raised BDNF, a brain growth factor, in stroke patients. Trials in healthy people haven't been done yet.
Research purposes only. Not FDA-approved for human use, and products vary in quality. Findings above are from the studies cited.
Not medical advice. Education only. We don't sell anything or tell you what to take. Label doses are there so you can follow along with your prescriber. Talk to a licensed clinician about your health.
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