N-Acetyl Semax Amidate Dosage, half-life & reference guide
Also known as NA Semax Amidate · NASA peptide · Semax Amidate
A modified version of Semax: acetylation and amidation are meant to slow its breakdown, for more potency and longer action per dose. No published human or animal study has tested this form, so everything else is borrowed from parent Semax.
- Studied range
- 100–600 mcg
- How often
- Daily
- Evidence
- ●
●●Emerging - Route
- Intranasal
Studied in research — not a recommendation.
How it works.
Acetylated and amidated form of Semax, designed to resist breakdown by the enzymes that degrade Semax; its bioavailability, potency and brain penetration have never been measured. Assumed to share Semax's mechanism. Users describe it as stronger per microgram than standard Semax and start at the lower end of the range.
Commonly reported: A stronger, quicker hit of focus and drive than regular Semax at a smaller dose, and irritability or poor sleep at higher doses or late in the day.
Where N-Acetyl Semax Amidate works.
Brain, nerves & sleep
Reported by users. Commonly reported: a stronger, quicker hit of focus and drive than regular Semax at a smaller dose.
An area lights for what a peptide is used for and what people report, with the evidence beside it. It isn’t a promise that it works there.
Week by week.
What to expect in the first 8 weeks
Day 1–3Community
Start low — this one bites
Users describe N-Acetyl Semax Amidate as more potent per mcg than regular Semax and start at the low end of the range. Commonly reported: effects come online within 30–60 min of nasal dosing, with a noticeable lift in focus, motivation and verbal fluency. Most dose in the morning, since evening doses tend to disrupt sleep.
The science
The acetyl and amide modifications at the N- and C-termini are designed to slow breakdown: aminopeptidases account for up to two-thirds of Semax breakdown in rat serum (Potaman 1993). Blood-brain barrier penetration hasn't been measured, and acetylation does change biology (it removed Semax's protective effect in a copper-toxicity cell assay; Magrì 2016). BDNF upregulation is shown for parent Semax in rats.
Sources- Potaman et al. (1993)
- Magrì et al. (2016)
Updated Sep 2026
Day 3–14Community
BDNF signal accumulating
Early days for the daily pattern. Commonly reported: focus and motivation feel steady rather than spiky, and some users notice better memory retention and learning speed. Irritability or poor sleep is the usual sign of overstimulation, and users drop the dose when it shows up.
The science
For parent Semax, a single nasal dose raised rat hippocampal BDNF 1.4-fold within hours (Dolotov 2006); whether BDNF accumulates with repeat dosing is untested. No study has tested the modified form's effects at any dose.
Sources- Dolotov et al. (2006)
Updated Sep 2026
Day 14–28Community
Cycle wrap — keep it short
Most users cap at 2–4 weeks, since continuous use of any ACTH-adjacent compound past ~4 weeks isn't well-characterized, and take 2+ weeks off before the next round.
The science
No chronic human dosing data exists for the acetylated-amidated form specifically. ACTH(4-10) analogs in general have not been studied long-term at supraphysiological exposure. The short-cycle pattern is conservative and derived from Russian clinical usage of the parent Semax.
Sources- Dolotov et al. (2006)
Updated Sep 2026
Any dayCommunity
What N-Acetyl Semax Amidate is built on
The parent Semax is approved in Russia with decades of clinical use. The modified N-acetyl-amidated form is a community-popularized variant with a chemical rationale (resisting breakdown) but no direct studies in animals or people. The only published work on N-acetyl Semax is lab chemistry.
The science
Semax itself is an ACTH(4-10) heptapeptide analog developed in Russia. Approved there for stroke recovery and cognitive indications. The N-acetyl-amidated form is assumed to share Semax's mechanism; its pharmacokinetics and safety haven't been studied, and the one biological comparison found shows acetylation changes activity (Magrì 2016).
Sources- Potaman et al. (1993)
- Magrì et al. (2016)
Updated Sep 2026
With N-Acetyl Selank and SelankCommunity
Focus + calm duo
Modified Semax handles focus and drive; modified Selank handles calm and anxiety. Common stack in the Russian-peptide community — morning Semax + midday/evening Selank, or just layered together for a balanced cognitive profile without one overpowering the other.
The science
In rat studies Semax raises BDNF and monoamine signaling for drive/focus, and Selank acts on GABA/serotonin for anxiolysis. Both inhibit enkephalin-degrading enzymes (Kost 2001), so they partly overlap. The stack is popular in the peptide community; no combination studies exist.
Sources- Dolotov et al. (2006)
- Kost et al. (2001)
Updated Sep 2026
Day 1 is the day you start it.
Mixing and a typical run.
Example numbers
Reconstitution example
Reconstitute a 5 mg vial of N-Acetyl Semax Amidate with 2 mL of bacteriostatic water and a 350 mcg dose is 14 units on a U-100 syringe, about 14 doses per vial.
- Vial
- 5 mg
- Water
- 2 mL
- Amount
- 350 mcg
Draw to14 units
0.3 mL insulin syringe · 30 units
Run notes
- Cycle
- 2–4 week cycles. Potency means many use less frequently than standard Semax. Often paired with N-Acetyl Selank, which isn't in this library.Community practice — opinions vary. Not a clinical recommendation.
- Timing
- Morning intranasal. Very potent — start low. Avoid evening dosing.
- Route
- Intranasal
- Stacks
- Semax
Safety.
Common side effects
- Irritability
- Overstimulation at high doses
- Headache
- Anxiety
Goes with.
Questions people ask.
What is N-Acetyl Semax Amidate?
A modified version of Semax: acetylation and amidation are meant to slow its breakdown, for more potency and longer action per dose. No published human or animal study has tested this form, so everything else is borrowed from parent Semax.
How is N-Acetyl Semax Amidate dosed in research?
The research range for N-Acetyl Semax Amidate is 100–600 mcg, daily, split dosing. Studied in research — not a recommendation.
How long does N-Acetyl Semax Amidate last?
The half-life of N-Acetyl Semax Amidate is expected to be longer than Semax (not measured).
What do people report on N-Acetyl Semax Amidate?
Commonly reported on N-Acetyl Semax Amidate: A stronger, quicker hit of focus and drive than regular Semax at a smaller dose, and irritability or poor sleep at higher doses or late in the day.
Is N-Acetyl Semax Amidate safe?
The research basis for N-Acetyl Semax Amidate is emerging: primarily preclinical / limited human data. Common side effects in the library: irritability, overstimulation at high doses, headache and anxiety.
What does N-Acetyl Semax Amidate stack with?
Common stacks for N-Acetyl Semax Amidate: Semax.
Research.
Reference.
- Cadence
Daily
Daily, split dosing
- Half-life
Expected to be longer than Semax (not measured)
- Research basis
●
●●EmergingPrimarily preclinical / limited human data
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