Semax
Quick facts
- Researched for
- Focus, memory, learning, verbal fluency and mental energy
- Route or form
- Injection (as NA-Semax); nasal spray coming soon
- Evidence so far
- Rat studies found it raised a brain growth factor; focus in healthy people is untested.
- Not established
- Studies of plain Semax do not directly prove what NA-Semax does.
- Commonly researched
- 400 mcg, dailyPractitionerSee every range
- Where to get it
- At our partner, US Precision Peptides.Go to Next step
By the Learn Peptides editorial team · Updated · How We Research
What people are researching it for
People are researching Semax for focus, memory, learning, verbal fluency, and mental energy.
This visual summary is about NA-Semax, the N-acetyl form. This page covers Semax in general, so not everything on it may apply to both.
Clearer thinking. Deeper focus. More mental runway.
- What is NA-Semax?
- a short peptide composed of 7 amino acids (Met-Glu-His-Phe-Pro-Gly-Pro)
- Checklist: 7 amino acids
- How does it work?
- Not written out in this text version.
- Common research use cases
- Not written out in this text version.
- How it's used in research
- Route: Intranasal (most common)
- Route: Subcutaneous
- Route: Other (varies by study)
- Common dosing: 100 to 300 mcg per dose (intranasal)
- Common dosing: 1 to 2 times per day
- Common dosing: Short cycles (e.g., 1 to 4 weeks)
- Common dosing: Protocols vary by research goal
- Often combined with: Selank (for balance)
- Often combined with: Other nootropics
- Often combined with: Cognitive support supplements
- Often combined with: Varies by research protocol
- There is no standardized dose or protocol. Research use should be thoughtful, tracked, and adjusted based on individual response.
- What users report
- Keep in mind: Best used earlier in the day
- Keep in mind: Responses vary widely
- Keep in mind: Not everyone responds
- Keep in mind: Some report overstimulation, anxiety, or sleep disruption
- Keep in mind: A few report no noticeable effects or even brain fog
- Key takeaway
- It's not a magic solution, and responses vary, but it's one of the most discussed peptides for brain health and performance for a reason.
- The bottom line
- NA-Semax is a promising research peptide for cognitive function, focus, and neuroprotection, but more high-quality human studies are needed. Use only high-purity peptides, follow a research-focused approach, and set realistic expectations.
Reasons people look into Semax. An interest is not a promise that it works.
- Cognitive & mood
Most talk is about focus, memory, learning, finding words and mental drive.
Community reports
Community discussion around plain Semax centers on focus, memory, learning, verbal fluency, and mental energy.
Community reports
Semax is a nasal or under-the-skin peptide people use during the day for focus, mental clarity, and less brain fog, often as a stimulant-free or stimulant-pairing option for attention issues. Reports are mixed: many people feel a real, clean boost, but a meaningful number feel nothing, and taking too much can bring on anxiety, trouble sleeping, or irritability.
It has animal studies and some human work, mostly outside U.S. clinics.
Semax has animal and some human research, largely outside U.S. clinical practice.
A brain-derived peptide discussed for focus, memory and mental clarity.
What this is based on
- Animal researchUseful for understanding a research question, but not the same as evidence in people.
- Community reportsWhat people describe noticing. Not proof of cause.
- Learn Peptides explanationOur own plain-English summary of the sources. It is not a source itself.
Studies of plain Semax do not directly prove what NA-Semax does.
Parent Semax studies do not directly prove the effects of NA-Semax.
Safety notes
Seen in animal studies. Results in animals often do not carry over to people.
- You have trouble breathing or wheezing, or your face, lips, tongue or throat swell.
- You get hives away from the injection site, or feel severely dizzy or faint.
For these signs, call 911 or your local emergency number.
- Redness spreads, or heat, swelling or pain keeps growing where you injected.
- A lump keeps growing or does not go away, or you see pus or red streaks.
- You have a fever or chills, or feel sick all over.
- Anxiety, panic, bipolar or another mood condition. It is stimulating. People report overstimulation, and one reported a manic episode with untreated bipolar II.
Questions to bring to your doctor
Only for the conditions this page cautions about. Bring this page with you.
- What mood changes on Semax should make me stop and call you?
Shows one practitioner amount for use in the nose; none is listed for injecting it.
Commonly researched ranges, and how they were measured.
Commonly researched range for Semax
400 mcg
daily · Nasal spray
Practitioner
This range is for nasal use. No commonly researched range is recorded for the injectable form yet.
The range in our record
Each one is labeled with where it comes from. They are different ways of using Semax, not steps to follow in order.
Quick-reference figure
Practitioner- Amount per dose
- 400 mcg
- How often
- Daily. Morning.
- Typical schedule
- Not stated
- Route
- Nasal spray
From our visual summary
Community reports
Community reports, from the Learn Peptides visual summary. These lines sit beside the ranges above and are not merged with them.
- Common dosing
- 100 to 300 mcg per dose (intranasal)
- 1 to 2 times per day
- Short cycles (e.g., 1 to 4 weeks)
- Schedules vary by goal
There is no standard dose. Track how you respond, and change one thing at a time.
These ranges were last reviewed Sep 2026.
Taken for focus and clear thinking, often with Selank; most talk is about nasal spray.
In rat studies, Semax raised brain-derived growth factor, a chemical the brain uses to build and strengthen its own connections. It's usually discussed as a , taken for a cognitive edge: sharper focus, clearer thinking, and better stress resilience. It's frequently discussed alongside Selank.
Next step
US Precision Peptides
US Precision Peptides sells NA-Semax, the N-acetyl form, a variant of Semax, not Semax itself.
About product links
Purchases at US Precision Peptides help keep Learn Peptides free.