What is N-acetyl Semax Amidate (Semax)?
N-Acetyl Semax Amidate is a modified version of the neuropeptide Semax, developed to improve stability and biological activity. Originally created in Russia, Semax has been studied for decades for its cognitive-enhancing and neuroprotective properties. The modifications in N-acetyl semax amidate extend its half-life and increase resistance to enzymatic breakdown, but the overall physiologic properties of semax have been shown to be retained.
How Does Semax Work?
Semax increases the expression of brain-derived neurotrophic factor (BDNF), a protein essential for learning, memory, and neural repair. It also modulates dopamine and serotonin pathways, supporting focus, mood, and mental clarity.
In neurological injury models, Semax has demonstrated protective effects against ischemic damage and inflammation.
What is Semax Used for?
Potential research applications of N-acetyl semax amidate include:
- Cognitive enhancement and focus
- Stroke and brain injury recovery
- Mood regulation and stress resilience
- Neurodegenerative disease research
Semax is approved for medical use in Russia but remains investigational elsewhere.
Side Effects of Semax
Semax has demonstrated a strong safety profile with minimal side effects. Mild headache or nasal irritation (when used intranasally) has been reported. Hormonal disruption has not been observed.
Semax Dosing Protocol (for Research)
N-Acetyl Semax Amidate in the research setting can be administered as a nasal spray or as an injection under the skin (subcutaneous). If following the injection dosing format, the recommended research protocol is the following:
| Phase | Dose & frequency |
|---|---|
| Weeks 1-2 | 0.3 mg (300 mcg) daily |
| Weeks 3-4 | 0.5 mg (500 mcg) daily |
| Week 5 and beyond | Up to 1 mg daily |
Shown for education. A licensed clinician should set any actual dose. Compare protocols across peptides in the peptide dosage chart.
Common questions about N-Acetyl Semax Amidate
What is N-Acetyl Semax Amidate?
N-Acetyl Semax Amidate is a modified version of the neuropeptide Semax, developed to improve stability and biological activity. Originally created in Russia, Semax has been studied for decades for its cognitive-enhancing and neuroprotective properties.
What is N-Acetyl Semax Amidate used for?
Areas studied include: Cognitive enhancement and focus; Stroke and brain injury recovery; Mood regulation and stress resilience; Neurodegenerative disease research.
How does N-Acetyl Semax Amidate work?
Semax increases the expression of brain-derived neurotrophic factor (BDNF), a protein essential for learning, memory, and neural repair. It also modulates dopamine and serotonin pathways, supporting focus, mood, and mental clarity.
What are the side effects of N-Acetyl Semax Amidate?
Semax has demonstrated a strong safety profile with minimal side effects. Mild headache or nasal irritation (when used intranasally) has been reported.
What is the dosage of N-Acetyl Semax Amidate?
One commonly referenced research protocol is: Weeks 1-2: 0.3 mg (300 mcg) daily; Weeks 3-4: 0.5 mg (500 mcg) daily; Week 5 and beyond: Up to 1 mg daily. Shown for education only; a licensed clinician should set any actual dose. See the dosing table.
How do you mix (reconstitute) N-Acetyl Semax Amidate?
Wipe the vial tops with alcohol, add bacteriostatic water slowly so it runs down the inside of the glass, then roll the vial gently until the powder dissolves; don’t shake it. See the step-by-step guide with diagrams for the pen and syringe methods.
How much bacteriostatic water do you add to N-Acetyl Semax Amidate?
There is no single correct amount. We recommend 2.1 mL: about 0.1 mL is lost during transfer, leaving roughly 2.0 mL of usable solution. You can add more or less (most peptide vials hold up to 3 mL); just enter the amount in the dose calculator. See the step-by-step mixing guide.
Is N-Acetyl Semax Amidate FDA-approved?
No. N-Acetyl Semax Amidate is not FDA-approved in the US (status as of October 2026).
References
- Park H, et al. Neurotrophin regulation of neural circuit development and function. Nat Rev Neurosci. 2013;14:7-23. doi: 10.1038/nrn3379. View source
- Romanova GA, et al. Neuroprotective and antiamnesic effects of Semax during experimental ischemic infarction of the cerebral cortex. Bull Exp Biol Med. 2006;142:663-6. doi: 10.1007/s10517-006-0445-0. View source
- Miasoedova NF, et al. Investigation of mechanisms of neuro-protective effect of semax in acute period of ischemic stroke. Zh Nevrol Psikhiatr Im S S Korsakova. 1999;99(5):15-9. Russian. View source