Peptides
Cortagen
A defined research tetrapeptide with rat nerve and mouse gene-expression findings, without established human recovery benefit in these sources.
Animal experiments; human efficacy and safety unresolved
Practical use
Reviewed practical notes
- Check the identity
- Distinguish the Cortagen tetrapeptide from the Cortexin mixture.
- Ask what improved
- Laboratory conduction measurements do not prove meaningful human recovery.
- Retain the unknowns
- No human benefit or safety conclusion is established by these two experiments.
Overview
Cortagen is the synthetic tetrapeptide Ala-Glu-Asp-Pro. Researchers designed it using information from Cortexin, a brain-cortex peptide mixture. A defined four-residue molecule and a tissue-derived mixture are different interventions; findings for one cannot simply be assigned to the other.
Risks and limitations
The cited animal experiments do not establish adverse-effect rates, interactions or long-term safety in people. A brief report of faster nerve growth is not enough to judge whether an intervention improves recovery without causing other harm.
How to read this
The useful evidence question is whether a study measured meaningful function in the relevant patient population. These reports describe laboratory nerve measurements and gene activity. Neither establishes improved memory, recovery from a human nerve injury or treatment of a neurological disease.
Research explained
Regenerating sciatic nerve in rats
Who was studied
Rats studied after surgical transection and repair of the sciatic nerve.
What was found
The report describes faster growth and conduction in regenerating nerve fibers after Cortagen exposure.
What it cannot establish
The short abstract does not provide sample size or enough design detail for a full bias assessment. Nerve growth and conduction are not equivalent to restored everyday function in patients.
Read the original studyMouse cardiac gene-expression experiment
Who was studied
Adult female mice; heart tissue examined after a brief experimental exposure.
What was found
Microarray analysis found changes in expression of genes involved in several cellular processes.
What it cannot establish
The experiment was performed in mouse heart tissue. Background claims about human benefit in the abstract are not human results from this experiment.
Read the original studyKeep the molecule and tissue model visible
A study can support a biological effect without supporting the proposed use. Changes in cardiac gene expression cannot establish a brain-specific therapeutic benefit, and the Cortexin name does not authenticate a Cortagen product.
Supporting sourceSources
2004 identity and mouse microarray study
Sources checked 2026-10-01.
General education; not a personal treatment plan.