Bioregulators (Khavinson peptides): research

Q: Which bioregulator is the most studied?

In terms of molecular studies, Epitalon is the most studied, especially around telomerase and telomere length. Thymalin is the most studied in the immunological context.

✦ In short

Bioregulators: Khavinson peptides (Epitalon, Cortagen, Cardiogen, Bronchogen, Cartalax, Pinealon, Thymalin) — what studies show. RUO.

Research context (RUO): Bioregulators are short peptides from the work of Vladimir Khavinson that are studied in laboratory research as tissue-specific gene regulators. All substances mentioned here are supplied exclusively for in-vitro laboratory research and are not intended for human or animal use.

Bioregulator peptides: the Khavinson peptides and the research behind them

Overview of the Khavinson bioregulators and their research context.

The term bioregulators peptides refers to a group of very short peptides (often two to four amino acids) that emerged from the research of the Russian gerontologist Vladimir Khavinson and the Saint Petersburg Institute of Bioregulation and Gerontology. The central hypothesis: each short peptide would “steer” a specific organ or tissue by influencing gene expression there. In this article, researchers and buyers explain what the concept of peptide bioregulators entails, which organ is the research target for each substance, and — importantly — how strong the evidence actually is.

What are peptide bioregulators?

The story begins in the 1970s and 1980s, when Khavinson and colleagues isolated peptide extracts from animal organs — the so-called cytomedins. From the thymus came Thymalin, from the pineal gland Epithalamine, from the cerebral cortex Cortexine. Later, researchers identified within those complex extracts short peptide sequences that would carry the presumed activity, and synthesised them as separate, defined peptides: the so-called cytogens. This gave rise to synthesised bioregulators such as Epitalon, Cortagen, Cardiogen, Bronchogen, Cartalax and Pinealon.

The underlying idea — called “peptidergic regulation” by the research group — is that these short peptides are small enough to reach cell membranes and even the cell nucleus, where they would bind to DNA regions and up- or down-regulate the expression of certain genes. Various in-vitro and animal models investigate whether each peptide is mainly active in the tissue from which the original extract derived — the concept of tissue specificity. Whether this mechanism holds in this form is scientifically not yet a settled matter.

How are bioregulators studied? — the presumed mechanism

Laboratory studies look at three recurring themes: gene expression, cell proliferation and inflammatory signalling. A 2004 microarray study (Anisimov, Khavinson & Anisimov), for example, reported that the cerebral cortex tetrapeptide Cortagen measurably altered the expression of over a hundred genes in mouse hearts — enough to support the idea of gene regulation. A 2022 in-vitro study on the human THP-1 monocyte/macrophage cell line reported that peptides including Epitalon and Thymalin stimulated cell growth while at the same time lowering the production of pro-inflammatory cytokines (TNF-α, IL-6) after LPS stimulation. This type of study describes molecular effects in a dish, not a clinical result in humans.

Which Khavinson peptides are there, and what is the research target per substance?

Below are the best-known synthetic bioregulators with, per substance, the tissue or organ that is considered the target in the research. The link “peptide → organ” comes from the research group's hypothesis; it has not been firmly confirmed in independent clinical studies.

Epitalon — pineal gland (epiphysis): derived from the pineal gland extract Epithalamine. In laboratory research most studied in relation to telomerase and telomere length. A study by Khavinson (2003) reported telomerase activity and telomere lengthening in human fibroblasts.
Cortagen — cerebral cortex: a tetrapeptide studied in animal models in relation to nerve tissue, recovery after injury and gene expression in neural and even cardiac tissue.
Cardiogen — heart muscle (myocardium): studied in the context of cardiovascular tissue and ageing of the myocardium.
Bronchogen — bronchi and lung tissue: studied with respect to the respiratory epithelium and the airways.
Cartalax — cartilage and connective tissue: studied in relation to cartilage, bone and joint tissue.
Pinealon — brain and neurons: a tripeptide studied in preclinical research in connection with neuronal tissues, oxidative stress and cognition.
Thymalin — thymus and immune system: not a synthetic short peptide but the original thymus peptide complex, most studied in connection with immune regulation and ageing of the immune system.

How strong is the evidence for bioregulator peptides?

This is the honest core of the story. The vast majority of publications on these peptides come from one research tradition: that of Khavinson and direct collaborations in Saint Petersburg. Many of the most frequently cited geroprotector reviews (for example Khavinson, Kuznik & Ryzhak, 2013) are summaries of the work of the same authors, partly published in Russian-language journals, with studies that are often small and not always set up according to modern, double-blind standards. Independent, large-scale replication by other laboratories is limited.

That does not mean there is nothing: there are real in-vitro and animal studies, and more recent research is attempting to replicate parts. In 2025, for example, an independently conducted study appeared that again looked at telomere lengthening by Epitalon in human cell lines. But the sober position for researchers is: the bioregulator hypothesis is interesting and partly supported by mechanistic data, but the strong “anti-ageing” claims circulating online around these peptides are not covered by the current strength of evidence. These substances therefore belong in the lab, not in health claims.

Bioregulators in laboratory research: handling & dissolving

Most Khavinson peptides are supplied as freeze-dried (lyophilised) powder and reconstituted in research protocols with bacteriostatic or sterile water. Because these are very short, relatively stable peptides, the same general laboratory principles apply regarding sterile working, dilution and cool storage. More background is available in the knowledge base pages on reconstituting peptides and which liquid you use to dissolve a peptide.

Quality & purity

With very short peptides, purity largely determines whether research results are reproducible. Every relevant batch is independently HPLC-tested by an external laboratory; the certificate of analysis (CoA) is publicly verifiable per batch. This makes it possible to check, for every bioregulator, which peptide is actually in the vial and at what purity — a precondition for reliable in-vitro work.

Frequently asked questions about bioregulator peptides

What exactly are Khavinson peptides?
It is a group of short peptides (and original organ extracts) that emerged from the research of Vladimir Khavinson. In laboratory research they are studied as presumed tissue-specific regulators of gene expression.

Why is it called “bioregulators” and not a medicine?
The term comes from the hypothesis that these peptides “fine-tune” physiological processes instead of blocking a single target. It is a research concept; the substances are not registered as a medicine and are offered exclusively for research.

Do bioregulators really work against ageing?
That is not proven. There are mechanistic in-vitro and animal studies, but most evidence comes from one research group and independent replication is limited. Strong anti-ageing claims are not covered by the current data.

What is the difference between Epitalon and Epithalamine?
Epithalamine is the original peptide extract from the pineal gland; Epitalon (AEDG) is the short, synthetic peptide sequence derived from it and defined in terms of composition.

Which bioregulator is the most studied?
In terms of molecular studies, Epitalon the most studied, especially around telomerase and telomere length. Thymalin is the most studied in the immunological context.

Are these peptides allowed to be used in humans?
No. All bioregulators on Peplife are Research Use Only and intended exclusively for in-vitro laboratory research, not for use in humans or animals.

Bioregulators (Khavinson peptides): the research explained