Quick Answer
Pinealon is the synthetic tripeptide Glu-Asp-Arg (EDR), one of the Khavinson bioregulators. Despite its name, its developers describe it as a component of Cortexin, a brain cortex peptide preparation, and its research focuses on neurons rather than the pineal gland. Cell and rodent studies report reduced oxidative stress and preserved dendritic spines, and DNA binding has some biophysical support. Human evidence is limited to a small Russian-language study and claims in the developers' own reviews.
Pinealon shows why bioregulator names should not be taken at face value: the name points to the pineal gland, while the research points to the brain cortex and neurons. This article covers its origin, the proposed mechanism, the studies by model, and the strength of the evidence.
What Pinealon is
Pinealon is a tripeptide of glutamic acid, aspartic acid and arginine, written Glu-Asp-Arg or EDR (molecular formula C15H26N6O8, molecular weight about 418.4 g/mol). It comes from Vladimir Khavinson's group at the St Petersburg Institute of Bioregulation and Gerontology. The group's own papers describe EDR as a peptide found in Cortexin, a polypeptide preparation derived from the cerebral cortex of cattle and pigs. Cortagen was designed from the same source preparation.
The pineal label does not hold up well. We found no indexed study linking Pinealon to melatonin production, and in the group's 2011 study of rat pineal gland tissue in culture, the stimulatory effects were reported for Epithalon and Vesugen, not Pinealon.
The proposed mechanism
Like the other bioregulators, Pinealon is proposed to enter cells, reach the nucleus and interact with DNA or histone proteins, changing the expression of genes involved in neuronal survival. Three lines of work bear on this.
- Cell entry: fluorescently labelled Pinealon was seen in the cytoplasm, nucleus and nucleolus of cultured HeLa cells, and in solution it interacted differently with different short DNA sequences, favouring those containing CAG.
- Physical binding: a physics group at Saint Petersburg State University, with no institute authors, used spectroscopy, NMR and molecular dynamics to show that EDR can partly enter the major groove of DNA and contact guanine. This is the most independent result on the mechanism, but it shows binding in solution, not gene regulation in cells.
- Modelling: the group's 2021 docking study predicted EDR binding sites in the promoter regions of genes such as CASP3, GAP43, APOE and SOD2, while noting that binding is probably of low selectivity and that the exact mechanism is unknown.
Cell studies also report effects on oxidative stress and ERK1/2 signalling, so DNA interaction is one proposed explanation, not a demonstrated one.
What the studies show
- Cell culture: in cerebellar granule cells, neutrophils and PC12 cells under oxidative stress, Pinealon limited the build-up of reactive oxygen species in a concentration-dependent way and reduced necrotic cell death. In mouse hippocampal neurons exposed to amyloid, it increased mature (mushroom) dendritic spines by 71%, back to the normal level.
- Rats: in pregnant rats with diet-induced hyperhomocysteinaemia, the offspring of treated mothers showed better spatial orientation and learning, and their cerebellar neurons accumulated fewer reactive oxygen species, with fewer necrotic cells.
- Mice: in 5xFAD mice, a model of Alzheimer's disease, EDR increased dendritic spine density on hippocampal CA1 neurons by about 11% versus saline-treated 5xFAD mice, restoring it to the control level, but did not change the overall proportion of mushroom spines. A trend towards restored synaptic plasticity was not statistically significant. A 2025 correction replaced two duplicated image figures; the authors state the conclusions are unaffected.
- Mixed results: a group in Rostov-on-Don, which later co-published with institute staff, found that in old rats with carotid artery occlusion the peptides tested improved survival, but Pinealon moderately raised brain caspase-3, an enzyme of programmed cell death, in both operated and sham-operated animals.
- Humans: the group's 2020 review describes better memory and headache measures in 72 patients with the after-effects of traumatic brain injury, where Pinealon was added to standard treatment. The source it cites is a Russian-language review by the same group, not a trial report, and related claims rest on a patent filing. A separate study of 32 adults reported a pro-oxidant signal alongside favourable biological age markers.
How strong is the evidence?
Early, and narrowly sourced. The cell and rodent findings point consistently towards neuroprotection, but almost all come from the St Petersburg network and its collaborators. The contributions from outside it are a biophysical binding study, which says nothing about effects in cells, and Russian-language rat work with mixed findings. There are no registered or published randomised trials.
A fair reading is that Pinealon is a candidate neuroprotective peptide with a plausible but untested mechanism, and that its name is a historical label rather than a guide to its biology.
Where Pinealon fits
Pinealon has often been tested side by side with Vesugen in neuronal models. For how the bioregulators fit together, see our guide to bioregulator peptides and what the Khavinson research actually claims.
References
- Khavinson V, et al. (2020). "EDR Peptide: Possible Mechanism of Gene Expression and Protein Synthesis Regulation Involved in the Pathogenesis of Alzheimer's Disease." Molecules. PubMed 33396470
- Khavinson VKh, et al. (2011). "Effect of short peptides on expression of signaling molecules in organotypic pineal cell culture." Bulletin of Experimental Biology and Medicine. PubMed 22803060
- Fedoreyeva LI, et al. (2011). "Penetration of short fluorescence-labeled peptides into the nucleus in HeLa cells and in vitro specific interaction of the peptides with deoxyribooligonucleotides and DNA." Biochemistry (Moscow). PubMed 22117547
- Silanteva IA, et al. (2019). "Role of Mono- and Divalent Ions in Peptide Glu-Asp-Arg-DNA Interaction." Journal of Physical Chemistry B. PubMed 30762356
- Khavinson V, et al. (2011). "Pinealon increases cell viability by suppression of free radical levels and activating proliferative processes." Rejuvenation Research. PubMed 21978084
- Kraskovskaya NA, et al. (2017). "Tripeptides Restore the Number of Neuronal Spines under Conditions of In Vitro Modeled Alzheimer's Disease." Bulletin of Experimental Biology and Medicine. PubMed 28853087
- Arutjunyan A, et al. (2012). "Pinealon protects the rat offspring from prenatal hyperhomocysteinemia." International Journal of Clinical and Experimental Medicine. PubMed 22567179
- Khavinson V, et al. (2021). "Neuroprotective Effects of Tripeptides-Epigenetic Regulators in Mouse Model of Alzheimer's Disease." Pharmaceuticals (Basel). PubMed 34071923
- Mendzheritskiĭ AM, et al. (2011). "Effects of introduction of short peptides before carotid artery occlusion on behaviour and caspase-3 activity in the brain of old rats." Advances in Gerontology (in Russian). PubMed 21809624
- Meshchaninov VN, et al. (2015). "Effect of synthetic peptides on aging of patients with chronic polymorbidity and organic brain syndrome of the central nervous system in remission." Advances in Gerontology (in Russian). PubMed 26390612