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N-Acetyl Semax Amidate (N-Acetyl Semax Amidate (NA Semax))

Category: Cognitive & Nootropic. Status: Research compound.

A more stable, longer-acting version of Semax with acetyl and amidate modifications that resist enzymatic breakdown. Used intranasally as a nootropic for focus, BDNF support, and neuroprotection.

How it works

A heptapeptide analog of ACTH(4-10) that increases BDNF and NGF expression, modulates the dopaminergic and serotonergic systems, and provides neuroprotective and pro-focus effects. The acetyl/amidate modifications extend its half-life versus plain Semax.

Key facts

  • Molecular weight: ~900 Da
  • Half-life: Longer than base Semax (modifications resist peptidases)
  • Bioavailability: Intranasal (primary); subcutaneous also used
  • Storage: Refrigerate (2-8°C); keep nasal solutions cold and use within the labeled window.

Dosing overview

  • Typical dose: ~300-600 mcg per day
  • Frequency: 1-2x daily
  • Duration: Cycled (e.g. weeks on/off)
  • Route: Intranasal spray/drops

Protocol notes

  • Common nootropic use is a few hundred mcg intranasally, 1-2x daily.
  • Often dosed in the morning/early afternoon to avoid overstimulation at night.
  • Frequently cycled (e.g. a few weeks on, then a break) and stacked with Selank.

Reported benefits

  • Improved focus and mental clarity
  • Raises BDNF/NGF (neurotrophic)
  • Neuroprotective
  • Longer-acting than base Semax

Possible side effects

  • Nasal irritation
  • Overstimulation/insomnia if dosed late
  • Mild headache (uncommon)

Research

  • Semax and BDNF expression (2016): Semax increased BDNF and related neurotrophic signaling in the hippocampus in animal models.

Community reviews of N-Acetyl Semax Amidate

Rated 4.6 out of 5 from 5 community reviews by ResearchSafe members.

  • quiet_gains rated it 5/5 - Finally broke through my plateau: Skeptical going in because I have been burned by hype before. N-Acetyl Semax Amidate actually delivered though. The appetite reduction is subtle but persistent, you just stop thinking about food between meals. First two weeks were rough with some nausea and low energy, but I stuck with the low starting dose and let my body adapt. By week 3 I was feeling normal with clearly reduced appetite. By month 2, the results on the scale were undeniable. Key advice: start at the lowest dose, do not rush titration, eat protein-forward, and stay hydrated. The compound does the heavy lifting on appetite,
  • syringe_science_sue rated it 4/5 - Works as advertised once you titrate properly: I have tried a lot of weight management approaches over the years and N-Acetyl Semax Amidate is the first that actually changed my relationship with food rather than just white-knuckling through hunger. The mental shift happened around week 2. Side effects were manageable. Some GI upset early on that settled by week 3. Mild constipation that fiber and water fixed. Nothing that made me want to stop. Results have been steady and sustainable. Losing about 1-2 lbs per week without feeling deprived. My energy is actually better than before, probably because I am not on the blood sugar roller coas
  • loading_phase_lucy rated it 5/5 - Down 12 lbs with minimal sides: I have tried a lot of weight management approaches over the years and N-Acetyl Semax Amidate is the first that actually changed my relationship with food rather than just white-knuckling through hunger. The mental shift happened around week 2. Side effects were manageable. Some GI upset early on that settled by week 3. Mild constipation that fiber and water fixed. Nothing that made me want to stop. Results have been steady and sustainable. Losing about 1-2 lbs per week without feeling deprived. My energy is actually better than before, probably because I am not on the blood sugar roller coas
  • needle_notes_nate rated it 4/5 - Steady progress without the usual hunger: Been running N-Acetyl Semax Amidate for about 2 months now and the appetite suppression is real. Not that awful "I cannot eat" feeling, more like the constant food noise just goes quiet. I actually forget about snacking, which never happened before. The first week had some mild nausea, especially after eating too fast or too greasy. Learned to eat slower and smaller portions and it resolved. Energy levels are good, no crashes or fatigue that some people report. Down about 6% body weight with no muscle loss that I can detect. Still hitting my lifts fine. The consistency is what impressed me m
  • quiet_gains rated it 5/5 - Appetite control is genuinely life-changing: Been running N-Acetyl Semax Amidate for about 3 months now and the appetite suppression is real. Not that awful "I cannot eat" feeling, more like the constant food noise just goes quiet. I actually forget about snacking, which never happened before. The first week had some mild nausea, especially after eating too fast or too greasy. Learned to eat slower and smaller portions and it resolved. Energy levels are good, no crashes or fatigue that some people report. Down about 6% body weight with no muscle loss that I can detect. Still hitting my lifts fine. The consistency is what impressed me m

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Community discussions about N-Acetyl Semax Amidate

Research and educational reference only. Not medical advice.