Cortexin vs Mod GRF 1-29
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 →Mod GRF 1-29
Mod GRF 1-29 (Modified GRF 1-29, also called CJC-1295 without DAC or Tetrasubstituted GRF 1-29) is a modified growth hormone-releasing hormone analog with improved stability over natural GHRH.
Full details →Side-by-Side Comparison
| Aspect | Cortexin | Mod GRF 1-29 |
|---|---|---|
| Dose Range | 10 mg–20 mg | 100 mcg–200 mcg |
| Frequency | 1x daily | 3x daily |
| Cycle Length | 1–2 weeks | 8–12 weeks |
| Route | intramuscular | subcutaneous |
| 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 GHRH receptors in the pituitary gland to stimulate growth hormone release. Four amino acid substitutions improve resistance to enzymatic degradation while maintaining biological activity. |
| Typical Dosage | Clinical protocols: 10mg intramuscularly once daily for 10-20 days. May be repeated after 3-6 month interval. | Typical dosing: 100-300mcg administered 2-3 times daily, usually combined with a GHRP like Ipamorelin for synergistic effects. |
| Administration | Intramuscular injection. Comes as lyophilized powder requiring reconstitution. Treatment given in courses rather than continuously. | Subcutaneous injection. Best administered on empty stomach. Short half-life (~30 minutes) necessitates multiple daily doses, unlike DAC version. |
| Side Effects | Generally well-tolerated. May cause injection site reactions or mild allergic responses in sensitive individuals. | Flushing, headache, dizziness, and injection site reactions. Generally well-tolerated. May cause water retention. |
| Best For |
What They Have in Common
Cortexin, Mod GRF 1-29 are both commonly used for:
Key Differences
Unique to Cortexin:
Unique to Mod GRF 1-29:
Which Has Stronger Evidence?
| Goal | Cortexin | Mod GRF 1-29 |
|---|---|---|
| Recovery & Healing | 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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