Peptide bioregulators: Epitalon, Pinealon, Thymalin, Cortexin and the Khavinson peptides
"Peptide bioregulators" is the name given to a family of compounds developed in the Soviet Union and Russia from the 1970s onwards, mainly by Vladimir Khavinson and colleagues in Saint Petersburg. The family includes extracts of animal organs, such as Thymalin and Cortexin, and very short synthetic peptides, such as Epitalon, Pinealon and Vilon. This guide explains how the two groups differ, what each compound has been studied for and why the evidence needs careful reading.
At a glance
| Compound | Type | Composition | Main research area |
|---|---|---|---|
| Thymalin | Organ extract | Peptide mixture from calf thymus | Immune function, ageing |
| Cortexin | Organ extract | Polypeptide mixture from cattle or pig brain cortex | Brain injury, stroke |
| Epitalon | Synthetic peptide | Ala-Glu-Asp-Gly (4 amino acids) | Ageing, telomerase, lifespan in rodents |
| Pinealon | Synthetic peptide | Glu-Asp-Arg (3 amino acids) | Protection of nerve cells |
| Vilon | Synthetic peptide | Lys-Glu (2 amino acids) | Thymus and immune cells |
| Cartalax | Synthetic peptide | Ala-Glu-Asp (3 amino acids) | Cartilage and connective tissue |
| Vesugen | Synthetic peptide | Lys-Glu-Asp (3 amino acids) | Blood vessel walls |
Two generations: extracts and short peptides
The extracts came first. In the 1970s, Vladimir Morozov and Vladimir Khavinson developed methods to isolate low-molecular-weight peptide fractions from animal organs. Thymalin, from calf thymus, was the first, followed by preparations from other tissues, including the pineal gland (epithalamin) and the brain cortex (Cortexin). Some of these became registered medicines in Russia and other post-Soviet countries; none is approved in the EU, the UK or the US.
The short peptides came later. The same group then analysed the extracts and designed synthetic peptides of two to four amino acids intended to reproduce their activity. Epitalon was designed after the pineal extract, Vilon after the thymus extract, and further peptides were named after the tissue they were meant to act on, such as Cartalax for cartilage and Vesugen for blood vessels. Being fully synthetic, they have a defined sequence and can be checked for identity and purity like any research peptide, which is not possible in the same way for an organ extract.
The proposed mechanism
The central idea of this research is that very short peptides can enter the cell nucleus, bind to specific stretches of DNA or to the histone proteins that package it, and switch tissue-specific genes on or off. A 2021 review by the group summarises the supporting work: cell-imaging studies showing peptides inside the nucleus, test-tube binding to DNA fragments and computer docking models.
This remains a hypothesis. It has not been confirmed by structural studies, and it has been tested mostly by the group that proposed it.
Epitalon
- Telomerase (2003): in cultures of human fetal fibroblasts, which normally lack telomerase activity, adding Epitalon induced the enzyme's catalytic subunit and its activity and lengthened telomeres, the protective caps at the ends of chromosomes.
- Lifespan in mice (2003): in female mice given Epitalon by injection five days a month from 3 months of age until natural death, mean lifespan did not change. The longest-living 10% lived 13% longer, maximum lifespan rose by 12% and leukaemia was six times less frequent, while total tumour incidence was unchanged.
Epitalon is often described online as proven to extend life or lengthen human telomeres. The published data are in cell cultures and rodents, and no placebo-controlled human trial measuring telomeres has been published.
Pinealon
Pinealon has been studied for protection of nerve cells against oxidative stress. In cell models it limited the build-up of reactive oxygen species and the cell death caused by homocysteine. In a 2012 rat study, pinealon given to pregnant rats with diet-induced high homocysteine improved learning and spatial orientation in their offspring and made their cerebellar neurons more resistant to oxidative stress. These are single studies from the same research group, without independent replication.
Thymalin and Vilon
Thymalin is a thymus peptide extract used in Russia as an immune-regulating medicine. Its clinical literature is mostly Russian-language, observational or small, rather than large randomised trials. Note that material sold internationally under the name Thymalin for research has no demonstrated equivalence to the registered Russian medicine. Vilon, the dipeptide Lys-Glu, was developed as a short synthetic counterpart and has been studied in cell and animal models of immune and thymus function.
Cortexin and Cerebrolysin
Cortexin is a mixture of small proteins and peptides extracted from cattle or pig brain cortex, registered in Russia for neurological conditions. It is often compared with Cerebrolysin, a peptide preparation from pig brain made in Austria and marketed for stroke and dementia in Austria, Germany and a number of other countries, but not approved in the US. They are not Khavinson short peptides, but they belong to the same idea of tissue-derived peptide mixtures.
A 2023 Cochrane review of Cerebrolysin and Cerebrolysin-like agents, including Cortexin, for acute ischaemic stroke found that adding either agent to standard treatment probably makes no difference to death from any cause, based on moderate-certainty evidence.
Cartalax and Vesugen
Cartalax (Ala-Glu-Asp) and Vesugen (Lys-Glu-Asp) are among the newer short peptides of the family, named for cartilage and blood vessels respectively. Their published research is limited, mostly cell studies from the developing group, much of it in Russian journals.
How to read this evidence
- One main source: most of the literature comes from one research network in Saint Petersburg, often published in Russian or in a small number of journals. Independent replication is rare.
- Mostly preclinical: the clearest results are in cell cultures and rodents. Human data are largely observational studies from the same group.
- Extract versus peptide: results for an organ extract cannot be transferred to its short synthetic counterpart, or the other way round. They are different materials.
- Read the numbers: as the Epitalon lifespan study shows, headline claims online are often stronger than the results in the original paper.
Regulatory status
None of the Khavinson peptides or extracts, including Cortexin and Thymalin, is approved as a medicine in the EU, the UK or the US. Cerebrolysin is authorised nationally in some European countries but not in the US. The products we sell are supplied for laboratory research only.
Handling
Lyophilised vials are stored like other research peptides: unopened vials in the freezer, reconstituted solutions in the refrigerator. Capsules should be kept closed, cool and dry. See our storage guide.
References
- Khavinson VK, Popovich IG, Linkova NS, Mironova ES, Ilina AR. Peptide regulation of gene expression: a systematic review. Molecules 2021;26(22):7053.
- Khavinson VK, Bondarev IE, Butyugov AA. Epithalon peptide induces telomerase activity and telomere elongation in human somatic cells. Bull Exp Biol Med 2003;135(6).
- Anisimov VN et al. Effect of Epitalon on biomarkers of aging, life span and spontaneous tumor incidence in female Swiss-derived SHR mice. Biogerontology 2003;4(4):193–202.
- Arutjunyan A, Kozina L, Stvolinskiy S, Bulygina Y, Mashkina A, Khavinson V. Pinealon protects the rat offspring from prenatal hyperhomocysteinemia. Int J Clin Exp Med 2012;5(2):179–185.
- Ziganshina LE, Abakumova T, Hoyle CHV. Cerebrolysin for acute ischaemic stroke. Cochrane Database Syst Rev 2023;10:CD007026.