NA-Semax-Amidate
Also known as: Semax-A, N-Acetyl Semax
An enhanced version of Semax with N-Acetyl modification and C-terminal amidation for improved stability and potency. Stronger nootropic and neuroprotective effects compared to standard Semax.
Research Status
Limited Clinical Data
For research purposes only. Not approved for human use. Not medical advice.
Research Areas
Side Effects
Occurs in 15-25% of intranasal users. Typically resolves within 1-2 weeks as nasal mucosa adapts. Manage by alternating nostrils, using saline rinse before administration, or reducing dose frequency temporarily.
Reported in 5-10% of users, usually during first week of use. Often related to increased cerebral blood flow or initial neurochemical adjustment. Resolves spontaneously; hydration and rest are supportive.
Occurs in 3-8% of users, particularly with afternoon or evening dosing. Manage by administering only in morning and early afternoon, at least 6-8 hours before bedtime.
Reported in <2% of users, typically at higher doses (>400 mcg daily). May reflect increased dopamine and norepinephrine signaling. Reduce dose or discontinue if persistent.
Reported in <1% of users. Likely related to monoaminergic effects on appetite regulation. Not clinically significant in most cases.
Reported in <1% of users with prolonged intranasal use or pre-existing nasal pathology. Discontinue use and consult a healthcare provider if bleeding persists.
True IgE-mediated allergic reactions are extremely rare (<0.1%) but possible. Discontinue immediately and seek emergency medical care if angioedema or anaphylaxis occurs. Obtain allergy testing if reaction is suspected.
Dosing Reference
| Parameter | Value |
|---|---|
| Dose range | 200-600 mcg |
| Frequency | 1-2x daily |
| Timing | Morning and early afternoon for optimal cognitive effects |
| Route | Subcutaneous |
Intranasal administration preferred for direct CNS access. Start at 200 mcg once daily and assess tolerance before increasing. For research purposes only.
Research disclaimer
Figures drawn from published research literature and community logs. Not clinical recommendations. Consult a qualified professional. Research use only.
Reconstitution Guide
Do not use saline or bacteriostatic saline — use only bacteriostatic water for reconstitution
Do not shake the vial vigorously; gentle swirling prevents peptide degradation
Discard immediately if the solution appears cloudy, discolored, or contains visible particles
Use within 30 days of reconstitution when stored at 2–8°C
Do not freeze the reconstituted solution; freezing may denature the peptide
Use the PeptideVolt reconstitution calculator for your exact concentration
Molecular and Pharmacological Data
| Sequence | Ac-Met-Glu-His-Phe-Pro-Gly-Pro-NH2 |
NA-Semax-Amidate is a synthetic peptide derived from adrenocorticotropic hormone (ACTH) that crosses the blood-brain barrier to enhance cognitive function through multiple neuroprotective and neuromodulatory pathways. The N-acetyl modification and C-terminal amidation increase stability and potency compared to standard Semax, allowing for improved bioavailability and sustained nootropic effects. It works primarily by modulating neurotransmitter systems, enhancing neuroplasticity, and protecting neurons from oxidative stress and apoptosis.
Neurotrophic Factor Signaling
NA-Semax-Amidate upregulates brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF), which support neuronal survival, growth, and synaptic plasticity essential for learning and memory formation.
Monoaminergic System Modulation
The peptide enhances dopamine and norepinephrine signaling in prefrontal cortex and striatum, improving attention, motivation, and executive function.
Oxidative Stress Reduction
NA-Semax-Amidate increases antioxidant enzyme expression (SOD, catalase) and reduces reactive oxygen species (ROS), protecting neurons from age-related and stress-induced damage.
GABAergic and Glutamatergic Balance
The peptide modulates inhibitory (GABA) and excitatory (glutamate) neurotransmission, reducing anxiety while maintaining optimal cognitive arousal and preventing excitotoxicity.
Neuroprotection Against Apoptosis
NA-Semax-Amidate activates anti-apoptotic signaling pathways and reduces pro-inflammatory cytokine production, protecting brain cells from programmed cell death.
- N-acetyl modification increases peptide stability and resistance to enzymatic degradation compared to unmodified Semax
- C-terminal amidation enhances receptor binding affinity and bioavailability
- Intranasal administration allows direct access to the central nervous system, bypassing the blood-brain barrier limitations
- Effects are cumulative — cognitive benefits typically emerge after 7-14 days of consistent use
- The peptide does not directly bind to a single receptor but modulates multiple neurotransmitter systems and intracellular signaling cascades
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