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Semax Amidate (N-Acetyl Semax Amidate) is a modified neuropeptide derived from adrenocorticotropic hormone (ACTH 4-10) that has been extensively studied in Russian and Eastern European neuroscience research for over three decades. The amidate modification (C-terminal amidation) confers greater proteolytic stability compared to the parent Semax molecule, extending its biological half-life and potentially improving CNS bioavailability. N-acetylation at the N-terminus further enhances blood-brain barrier penetration in research models.
Semax and its derivatives are among the most studied nootropic peptides in preclinical literature, with documented effects on BDNF expression, dopaminergic tone, and neuroprotection under oxidative stress conditions. The compound is approved for medical use in Russia under the brand name Semax® for stroke and cognitive impairment indications.
Mechanism of Action
Semax Amidate operates through several converging neuropeptide pathways:
BDNF Upregulation: Increases brain-derived neurotrophic factor mRNA and protein expression in hippocampal and prefrontal regions — the primary mechanism implicated in cognitive and mood research
Dopaminergic Modulation: Enhances dopamine release and receptor sensitivity in prefrontal and limbic circuits, relevant for attention and executive function research
Serotonergic Effects: Influences 5-HT1A receptor activity, contributing to documented anxiolytic and mood-related effects
Neuroprotection: Attenuates oxidative stress and neuroinflammation in ischemia and excitotoxicity models through BDNF-TrkB signaling
ACTH Receptor Agonism: Stimulates melanocortin receptors (MC4R) that mediate learning, attention, and stress adaptation pathways
NGF Enhancement: Increases nerve growth factor expression, supporting neuronal differentiation and survival research
Preclinical and Clinical Research Data
Cognitive and Memory Research
Multiple Russian clinical studies and preclinical models have documented Semax’s effects on cognition:
Significant improvement in spatial memory and working memory tasks in rodent models at doses of 50–200 µg/kg
Enhanced learning acquisition rate in Morris water maze protocols
Improved attention and processing speed metrics in human clinical trials for ischemic stroke (registered in Russia)
BDNF increases of 100–200% over baseline observed in hippocampal tissue within 24 hours of administration in rodent studies
Neuroprotection Research
Demonstrated 40–60% reduction in infarct volume in middle cerebral artery occlusion (MCAO) rodent stroke models
Attenuation of glutamate-induced excitotoxicity in cortical cell cultures
Preservation of neuronal viability under H₂O₂-induced oxidative stress conditions
Anxiety and Stress Models
Reduced anxiety-like behavior in elevated plus maze and open field tests in rodents
Attenuated HPA axis hyperactivation under chronic restraint stress
Normalized corticosterone responses in repeated stress paradigms
Dosage Reference for Research
Research Context
Typical Dose
Route
Notes
In vitro
1–100 nM
Media
BDNF upregulation studies
Rodent (acute)
50–200 µg/kg
Intranasal or SC
Cognitive and stroke protocols
Rodent (chronic)
50–100 µg/kg/day
Intranasal
14–28 day protocols
Human (Russian clinical)
200–600 µg/day
Intranasal
Stroke, cognitive impairment
Research reference only. Not dosing guidance for human use.
Semax vs. Semax Amidate — Key Differences
Parameter
Semax
N-Acetyl Semax Amidate
Sequence modification
None (base peptide)
N-acetyl + C-terminal amide
Proteolytic stability
Moderate
Higher (resistant to enzymatic cleavage)
BBB penetration
Moderate (intranasal)
Enhanced (N-acetylation increases lipophilicity)
Research potency
Base reference
Generally ~2–5x more potent per equivalent dose
Available formats
Powder, spray
Powder, spray
Where to Source Semax Amidate for Research
Key criteria when evaluating research peptide suppliers for Semax Amidate:
HPLC purity ≥99% with published certificate of analysis
Mass spectrometry confirmation of correct modification (N-acetyl + amidate)
Sterility and endotoxin testing if intended for in vivo protocols
Lyophilized format for long-term −20°C storage stability
Spray formulation availability for intranasal delivery protocols
Research Disclaimer: All information on this page is for educational and scientific reference purposes only. Semax Amidate is not approved for human use in most jurisdictions outside Russia. This product is sold strictly for in vitro research and laboratory use only. Not for human consumption. Not medical advice.
