Semax
Gut untersuchtSynthetic ACTH Analog | Nootropic & Neuroprotective Peptide
Semax is a synthetic heptapeptide derived from adrenocorticotropic hormone (ACTH) fragment 4-10, originally developed in Russia for stroke recovery.
Molekulare und Forschungsdaten
- Sequenz
- Met-Glu-His-Phe-Pro-Gly-Pro
- Molekulargewicht
- 813.93 Da
- Halbwertszeit
- 0.5-2 hours
- Primäre Ziele
- bdnf, dopamine-receptor
- Wege (Forschung)
- nasal, injectable
- Lagerung
- Reconstituted: 2-8°C, use within recommended timeframe
Overview
Semax is a synthetic heptapeptide derived from adrenocorticotropic hormone (ACTH) fragment 4-10, originally developed in Russia for stroke recovery. It achieves enhanced CNS penetration through direct transport via olfactory epithelium and trigeminal nerves, bypassing the blood-brain barrier.
Mechanism of action
Rapidly increases BDNF levels, modulates dopaminergic and serotonergic systems, and achieves direct brain delivery through olfactory transport with 0.093% blood-brain barrier penetration (vs 0.01% IV).
Key research findings
- Rapid brain delivery via intranasal route
- Rapidly increases BDNF levels
- Extensive clinical research in Russia
- Easy self-administration
- Modulates dopamine and serotonin systems
- Neuroprotective effects
Research applications
Cognitive
- Memory Enhancement — Improved short-term and working memory performance in fatigued individuals (71% vs 41% accuracy).
- Attention and Focus — Enhanced sustained attention during demanding cognitive tasks.
- Learning Acceleration — Faster acquisition of new information and improved retention.
Neuroprotection
- Stroke Recovery — Accelerated rehabilitation with increased BDNF levels in stroke patients.
- Brain Trauma Support — Supports recovery from traumatic brain injury.
- Neurodegenerative Prevention — Shows anti-amyloid properties in Alzheimer’s models.
Neuroplasticity
- BDNF Upregulation — Supports neurogenesis through increased brain-derived neurotrophic factor.
- Neural Connectivity — Enhanced neural connections and brain network activity.
- Stress Resilience — Improved ability to cope with cognitive stress.
Semax Häufig gestellte Fragen
Why is intranasal Semax 9x better at crossing the blood-brain barrier than IV?+
Intranasal delivery (0.093% BBB penetration) bypasses the blood-brain barrier entirely by using olfactory nerve transport directly to the brain. IV injection (0.01% BBB penetration) relies on the peptide crossing from blood into brain tissue, which is blocked by the BBB. This is why intranasal Semax is the preferred route despite being counterintuitive.
Does Semax actually reverse amyloid plaque buildup in Alzheimer's?+
In mouse models, yes. A 2025 study showed 2.8-fold reduction in amyloid plaques in Alzheimer's mice. However, this is preclinical data. No human clinical trials exist for Semax and Alzheimer's. The mechanism (anti-amyloid + anti-aggregating effects) is promising, but human efficacy remains unknown.
Can I take Semax every day, or should I cycle it?+
Semax is typically used in 2-4 week cycles rather than indefinitely. While it doesn't cause dependence like benzodiazepines, continuous use without breaks hasn't been extensively studied for optimal long-term results. The 4-6 hour duration per dose means daily dosing is common, but periodically cycling off allows receptor sensitivity to reset.
Will Semax help me recover faster from a stroke?+
Yes. Clinical evidence supports Semax for stroke recovery. In a 110-patient trial, 6000 mcg/day intranasal increased BDNF levels and accelerated functional recovery during rehabilitation. It's one of Semax's most established therapeutic applications with actual human clinical data backing it.
References
- [1]A Nootropic Adrenocorticotropin Analog 4-10 Semax: 15 Years Experience in Its Design and StudyZhurnal Vysshei Nervnoi Deiatelnosti imeni I.P. Pavlova
- [2]The Efficacy of Semax in the Treatment of Patients at Different Stages of Ischemic StrokeZhurnal Nevrologii i Psikhiatrii imeni S.S. Korsakova
- [3]Effects of Semax on the Default Mode Network of the BrainBulletin of Experimental Biology and Medicine
- [4]The Peptide Semax Affects the Expression of Genes Related to the Immune and Vascular Systems in Rat Brain Focal Ischemia: Genome-Wide Transcriptional AnalysisBMC Genomics
- [5]Semax, an Analog of ACTH(4-10) with Cognitive Effects, Regulates BDNF and trkB Expression in the Rat HippocampusBrain Research
- [6]The Potential of the Peptide Drug Semax and Its Derivative for Correcting Pathological Impairments in the Animal Model of Alzheimer's DiseaseInternational Journal of Molecular Sciences
- [7]Semax, a Synthetic Regulatory Peptide, Affects Copper-Induced Abeta Aggregation and Amyloid Formation in Artificial Membrane ModelsACS Chemical Neuroscience
- [8]Semax Peptide Targets the Mu Opioid Receptor Gene Oprm1 to Promote Functional Recovery After Spinal Cord InjuryBritish Journal of Pharmacology
- [9]Semax, a Copper Chelator Peptide, Decreases Cu(II)-Catalyzed ROS Production and Cytotoxicity of AbetaBioinorganic Chemistry and Applications
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