Article

Pinealon (Glu-Asp-Arg): the EDR tripeptide and its research record

Published 31 October 2026 · CognitivePepti Research Desk

Prepared by: Research Desk. Sources are linked for verification.

Published 31 October 2026

At a glance

What it is: pinealon is the synthetic tripeptide Glu-Asp-Arg, often written EDR, one of the short "bioregulator" peptides studied by Vladimir Khavinson's group in St Petersburg
Main evidence: cell-culture studies, rodent studies and docking models, nearly all from the same research network
Proposed mechanism: the group suggests that short peptides enter the cell nucleus and interact with DNA or gene promoters; this has not been confirmed by independent laboratories as far as we could find
Human data: a small number of Russian-language reports; no registered clinical trials on ClinicalTrials.gov when we searched on 31 October 2026
Status: not an approved medicine in the US or EU as far as we could find

Where pinealon comes from

Khavinson and colleagues at the St Petersburg Institute of Bioregulation and Gerontology have spent several decades studying short peptides of two to four amino acids, which they call peptide bioregulators or "cytogens". Pinealon is one of these. It is a sibling of the tetrapeptide Ala-Glu-Asp-Gly, covered on this site as Epithalon. A 2020 review by the same group summarises the work on EDR alongside other short peptides (Khavinson et al., 2020, PubMed).

Cell studies

Oxidative stress, 2011: in cerebellar granule cells, neutrophils and PC12 cells, pinealon limited the build-up of reactive oxygen species and reduced necrotic cell death. The authors also reported delayed ERK1/2 activation and changes in the cell cycle, and argued from this that the peptide may act on the genome directly (Khavinson et al., 2011, PubMed).
Nuclear entry, 2011: fluorescein-labelled short peptides, including EDR, epithalon and testagen, were seen in the cytoplasm, nucleus and nucleolus of HeLa cells, and fluorescence-quenching data were used to argue for sequence-specific binding to DNA (Fedoreyeva et al., 2011, PubMed).
Serotonin, 2014: in ageing cultures of brain cortex cells, EDR and the related tripeptide KED were reported to increase serotonin expression, and docking was used to propose an interaction with the gene for tryptophan hydroxylase, the enzyme that makes serotonin (Khavinson et al., 2014, PubMed).
Dendritic spines, 2017: in cultured mouse hippocampal neurons exposed to amyloid (a cell model of Alzheimer's disease), EDR increased the number of mushroom-type dendritic spines by 71%, against 20% for the related tripeptide KED (Kraskovskaya et al., 2017, PubMed). An erratum to this paper was published the following month.
Induced neurons, 2024: neurons made by reprogramming skin fibroblasts from older donors showed more dendritic branching with EDR, KED and AEDG. EDR reduced a marker of oxidative DNA damage, while none of the tripeptides changed mitochondrial or lysosomal activity or p16 levels (Kraskovskaya et al., 2024, PubMed).

Animal studies

Prenatal hyperhomocysteinemia, 2012: in the offspring of rats with experimentally raised homocysteine during pregnancy, pinealon given to the pregnant rats was reported to go with better spatial orientation and learning in the offspring, and with less reactive oxygen species accumulation and fewer necrotic cells in cerebellar neurons isolated from them (Arutjunyan et al., 2012, PubMed).
Aged rats, 2015: a Russian-language study compared pinealon with Cortexin, a brain-derived peptide preparation, in 18-month-old rats under acute hypobaric hypoxia or mild hypothermia. It reported effects on behaviour, catecholamines and cortical serotonin, with Cortexin having the stronger effect on free-radical processes and caspase-3 activity (Mendzheritsky et al., 2015, PubMed).
5xFAD mice, 2021: in this transgenic Alzheimer's model, the group reported that EDR and KED prevented the loss of dendritic spines, and used docking to propose EDR binding sites in the promoter regions of genes such as CASP3, APOE and SOD2 (Khavinson et al., 2021, PubMed). An erratum to this paper was published in 2025.

Human reports

The human literature is thin. A 2012 Russian-language paper compared the neurobehavioural status of 150 male lorry drivers with that of 150 metal workers and reported better psychoemotional scores after the use of "bioregulating peptides", with the largest effect for a combination of pinealon and another short peptide, vezugen (Bashkireva & Artamonova, 2012, PubMed). The abstract does not describe randomisation, blinding or a placebo group for the peptide part of the study. We found no randomised, placebo-controlled trial of pinealon and no entry for it on ClinicalTrials.gov.

Limitations

One research network: almost all pinealon papers come from Khavinson's institute and its collaborators, and independent replication is limited
Model systems: most findings come from cell cultures and rodents, often at a single concentration or in a single model
Mechanism: the idea that a tripeptide acts by binding DNA or promoters rests mainly on fluorescence and docking data, which do not show a functional effect on their own
Corrections: two of the key papers (2017 and 2021) carry published errata
Language: several studies appear only in Russian-language journals with short English abstracts

Key terms

Tripeptide: a peptide of three amino acids; EDR is glutamic acid, aspartic acid and arginine
Peptide bioregulator (cytogen): the St Petersburg group's term for short peptides that it proposes regulate gene expression
Mushroom spine: a mature type of dendritic spine associated with stable synapses
5xFAD mouse: a transgenic mouse carrying five familial Alzheimer's mutations, used to model amyloid pathology
Molecular docking: a computer simulation that predicts how one molecule may fit against another

Supplier

Purita is a store that sells peptides for laboratory research use only. When we checked on 31 October 2026 it did not have a pinealon product page, and we have not checked whether pinealon appears anywhere else in its catalogue. The link below goes to its neurological research category.

Purita neurological category

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