Cortexin vs NA-Semax Amidate
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
Cortexin
Cortexin is a polypeptide complex derived from pig brain cortex, used clinically in Russia and Eastern Europe for neurological conditions including stroke recovery, traumatic brain injury, and cognitive decline.
Full details →NA-Semax Amidate
NA-Semax Amidate (N-Acetyl Semax Amidate) is a modified version of Semax with enhanced stability and potency. Also known as NASA, it provides stronger and longer-lasting nootropic effects than standard Semax.
Full details →Side-by-Side Comparison
| Aspect | Cortexin | NA-Semax Amidate |
|---|---|---|
| Dose Range | 10 mg–20 mg | 300 mcg–600 mcg |
| Frequency | 1x daily | 2x daily |
| Cycle Length | 1–2 weeks | 2–4 weeks |
| Route | intramuscular | intranasal |
| Mechanism | Contains a mixture of neuropeptides and amino acids that support neuronal metabolism, provide neuroprotection, and enhance synaptic transmission. Specific mechanisms not fully characterized. | Maintains Semax's core actions on BDNF, NGF, and monoamine systems with improved pharmacokinetics. The modifications enhance CNS penetration and extend duration of action. |
| Typical Dosage | Clinical protocols: 10mg intramuscularly once daily for 10-20 days. May be repeated after 3-6 month interval. | Intranasal: 100-600mcg 1-2 times daily. Start with lower doses as it's more potent than standard Semax. |
| Administration | Intramuscular injection. Comes as lyophilized powder requiring reconstitution. Treatment given in courses rather than continuously. | Intranasal spray is most common. Can be used sublingually. More stable than standard Semax in solution. |
| Side Effects | Generally well-tolerated. May cause injection site reactions or mild allergic responses in sensitive individuals. | May cause irritability, hair shedding (rare), or overstimulation at high doses. Generally well-tolerated. |
| Best For |
What They Have in Common
Cortexin, NA-Semax Amidate are both commonly used for:
Key Differences
Unique to Cortexin:
Which Has Stronger Evidence?
| Goal | Cortexin | NA-Semax Amidate |
|---|---|---|
| Cognitive Performance | medium | medium |
Key Studies
Cortexin
- [Cortexin in the comprehensive therapy of alcoholic encephalopathy].
Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova, 2026
- Cortexin modulates OPG/RANK/RANKL and TRPC1 expression in cerebral ischemia-reperfusion injury.
Neurological research, 2026
- Neurotropic Effects of Cortexin on Models of Mental and Physical Developmental Delay.
Biomedicines, 2025
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