NA-Semax
Also known as N-Acetyl Semax
Quick facts
- Researched for
- Focus, memory, recall, smoother speech, mental clarity and getting tasks done
- Route or form
- Injection; nasal spray coming soon
- Evidence so far
- Only people’s reports back this form, and much about its safety is not known.
- Not established
- No human trial has shown it works better than plain Semax.
- Commonly researched
- 100 to 300 mcg, per use, usually in the morning. Some repeat it during the dayCommunity reports for NA-Semax and related analogsSee 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 NA-Semax for focus, memory, recall, smoother speech, mental clarity, and getting tasks done.
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 NA-Semax. An interest is not a promise that it works.
- Cognitive & mood
Reports range from strong gains in focus and speech to subtle or no change.
Community reports
Reports range from strong improvements in focus, task completion, recall, or smoother speech to subtle changes or no noticeable effect.
N-Acetyl Semax is a modified version of the peptide Semax that people take through the nose, mostly hoping for clearer thinking, easier focus and smoother speech.
What this is based on
- 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.
Community reports
People mainly use N-Acetyl Semax hoping for clearer thinking, easier focus, staying on task and smoother speech. Reports split sharply: some describe a clear benefit, some a subtle one, many feel nothing at all, and a smaller group reports the opposite, such as anxiety, irritability or brain fog.
The stronger published studies are on plain Semax, not this N-acetyl form.
The stronger published research is on plain Semax, the parent compound, not NA-Semax.
No human trial has shown it works better than plain Semax.
No human trial has shown that NA-Semax is better than plain Semax.
Safety notes
The studies were done on plain Semax, not this form. Feeling overstimulated, anxious or unable to sleep is the most common complaint.
- 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. The most common bad reaction people report is feeling overstimulated: anxious, irritable, angry or unable to relax. One account describes a manic-like state.
- You take sleeping pills or other sedating medicine. People who respond strongly sometimes report trouble sleeping, which is why many take it early in the day.
- Some people get the reverse of what they hoped for: brain fog, trouble finding words and worse short-term memory.
- Headache, head pressure, tingling and a detached, unreal feeling have been reported.
- Many accounts involve taking it with stimulants, prescription ADHD medicines or other compounds, and nothing in our research review shows what those combinations do.
- No human study has tested N-Acetyl Semax itself. The human research is on plain Semax, so its results and its safety record cannot be assumed for this variant.
- Safety is largely unknown for this variant: our research review gives no safety studies, nothing on long-term use and nothing on use with psychiatric conditions or medicines. The scattered hair and vision reports are weak signals with no established link. Unknown safety is not an all-clear.
Questions to bring to your doctor
Only for the conditions this page cautions about. Bring this page with you.
- What mood changes on NA-Semax should make me stop and call you?
- Is it safe to use NA-Semax with my sleep medicine?
Shows 1 nasal range pooled from related forms; none is listed for injecting it.
Commonly researched ranges, and how they were measured.
Commonly researched range for NA-Semax
100 to 300 mcg
per use, usually in the morning. Some repeat it during the day · Nasal spray
Community reports for NA-Semax and related analogs
The reports give this range for NA-Semax and closely related forms together, not for NA-Semax alone, and for nasal use. Some people go higher, with no figure given. 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 NA-Semax, not steps to follow in order.
Focus and mental clarity
Community reports for NA-Semax and related analogs- Amount per dose
- 100 to 300 mcg
- How often
- Per use, usually in the morning. Some repeat it during the day
- Typical schedule
- Short runs of 1 to 2 weeks, or 5 days on and 2 off
- Route
- Nasal spray
The reports give this range for NA-Semax and closely related forms together, not for NA-Semax alone. Some people go higher, with no figure given.
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.
It is modified Semax; in the reports, people mostly take it through the nose.
N-Acetyl Semax (often written NA-Semax) is a chemically modified version of Semax, a short peptide built from seven . In the community reports reviewed, people mostly take it through the nose, usually early in the day. The published animal and human studies were done on plain Semax, the parent compound, not on this variant. A third form, N-Acetyl Semax Amidate, is a separate variant and is not what this record covers.
Not the same as
- N-Acetyl Semax is not plain (standard) Semax. Plain Semax is the form the animal and human studies were done on.
- N-Acetyl Semax is not N-Acetyl Semax Amidate (sometimes shortened to NASA). The amidate has one more chemical change and its own forum reputation for being stronger and longer lasting.
- Forum posts often lump plain Semax, N-Acetyl Semax and N-Acetyl Semax Amidate together, so many reports do not make clear which form the person used.
- It is not Selank, a separate compound that people on forums often pair with it.
- The 2026 FDA advisory committee review covered plain Semax only, not N-Acetyl Semax or the amidate.
Next step
Product forms
Forms of NA-Semax. Each one shows its own product link, or why there is none.
NA-Semax nasal spray
Made to order. Arrives ready to use.
No mixing or reconstitution needed.
Strength, amount per spray and dosing are not set yet.
No partner product
Coming soon. This form is not listed at US Precision Peptides yet, so there is no product link.
NA-Semax + NA-Selank nasal spray
Made to order. Arrives ready to use.
No mixing or reconstitution needed.
The ratio, strength, amount per spray and dosing are not set yet.
This product also contains NA-Selank. Reports about one ingredient do not describe the two together.
No partner product
US Precision Peptides has no listing for this form yet, so there is no product link.
NA-Semax 10 mg vial
10 mg per vial. This is the total in one vial, not an amount to take.
The reports and amounts on this page are about nasal use. They do not describe this vial.
About product links
Purchases at US Precision Peptides help keep Learn Peptides free.