Extract vs synthetic gap: the human outcome data (including the
266-patient mortality cohort) was collected on extracts; vendors sell synthetic fragments.
No head-to-head trial exists — evidence does not transfer between them.
Details →
Khavinson studies (5 matched, 2000–2011)
Keyword-filtered from the 472-publication database (khavinson.info). EXTRACT/SYNTHETIC
tags are title-text heuristics — verification is on the reader. Full tag legend:
evidence-tiers.html
[137] Anisimov S.V., Khavinson V.Kh., Anisimov V.N. Elucidation of the effect of brain cortex tetrapeptide Cortagen on gene expression in mouse heart by microarray. // Neuroendocrinology Letters. - 2004. - Vol. 25. N 1/2. - P. 87-93. (2004)untag[PDF]
[206] Turchaninova L.N., Kolosova L.I., Malinin V.V., Moiseeva A.B., Nozdrachev A.D., Khavinson V.Kh. Effect of Tetrapeptide Cortagen on Regeneration of Sciatic Nerve. // Bulletin of Experimental Biology and Medicine. - 2000. - Vol. 130, N 12. - P. 1172-1174. (2000)ext
[156] Grigoriev E.I., Khavinson V.Kh., Malinin V.V. Obtaining and medical application of novel synthetic peptide Cortagen. // 5 th German Peptide Symposium. - Bielefeld. - Progr. and Abstr.: Universität Bielefeld. - 2001. - P. 68. (2001)syn
[166] Trofimova S.V., Khavinson V.Kh. Effect of Retinalamin and Cortexin on the Development of Age-Related Macular Degeneration. // 17 th World Congress of the International Association of Gerontology. - Vancouver, Canada. - Abstr.: Gerontology. - 2001. - Vol. 47, Suppl. 1. - P. 430-431. (2001)ext
Independent (non-Khavinson) studies
None catalogued. To date there are zero independent Western human trials of any Khavinson compound, in any year. Independent in-vitro data exists for Epitalon only (two 2025 studies). If a study belongs here, add it to non-khavinson-research.json and rebuild.
Reddit meta-scrape
1 post in corpus (r/nkj7jq, high-scoring Cortexin guide on r/Nootropics) + intranasal tutorial thread (r/12sdvhc) + experience comments.
Positive reports
'I enjoyed Cortexin when I tried it. Can't say I found it better than Cerebrolysin but it's a solid peptide.' (r/1dlhibs comment)
Widely used in post-Soviet space for stroke/TBI/pediatric neurology with claimed benefit.
Neutral / no-effect
Most Reddit discussion is about administration (intranasal vs injection) rather than effects.
MEASURED vs VIBE: 0 measured. No user posted cognitive testing data or EEG before/after.
Common protocol: Typically 5-10mg IM daily x 10 days. Intranasal discussed as alternative in r/Nootropics tutorial.
Key takeaway: Cortexin is the most-prescribed neurological agent in the post-Soviet space. Reddit reports are sparse and subjective. No independent Western RCT. The BMJ TESTS null (for adjacent thymosin alpha-1) should temper enthusiasm.