Cortexin vs FGL
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 →FGL
FGL (FG Loop) is a synthetic peptide that mimics the neural cell adhesion molecule (NCAM) FG loop region. It promotes neuroplasticity and has shown cognitive-enhancing effects in research.
Full details →Side-by-Side Comparison
| Aspect | Cortexin | FGL |
|---|---|---|
| Dose Range | 10 mg–20 mg | 500 mcg–1 mg |
| Frequency | 1x daily | 1x daily |
| Cycle Length | 1–2 weeks | 4–8 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. | Binds to FGFR1 (fibroblast growth factor receptor 1) to activate downstream signaling cascades that promote neurite outgrowth, synaptic plasticity, and neuronal survival. |
| Typical Dosage | Clinical protocols: 10mg intramuscularly once daily for 10-20 days. May be repeated after 3-6 month interval. | Research protocols have used subcutaneous doses ranging from 1-10mg. Intranasal administration also studied. Optimal dosing not established. |
| Administration | Intramuscular injection. Comes as lyophilized powder requiring reconstitution. Treatment given in courses rather than continuously. | Subcutaneous injection or intranasal administration. Research compound with limited human dosing data. |
| Side Effects | Generally well-tolerated. May cause injection site reactions or mild allergic responses in sensitive individuals. | Limited human data available. Animal studies show good tolerability. |
| Best For |
What They Have in Common
Cortexin, FGL are both commonly used for:
Key Differences
Unique to Cortexin:
Which Has Stronger Evidence?
| Goal | Cortexin | FGL |
|---|---|---|
| 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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