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Synthetic dipeptide immunomodulator (Khavinson class)

Thymogen

Thymogen is a synthetic dipeptide, L-glutamyl-L-tryptophan (Glu-Trp), from the Khavinson family of short-peptide bioregulators. Identified as an active fragment of the thymic extract thymalin, it has been studied for effects on immune cell differentiation in Russian research. It is not authorized by Health Canada, and this page is educational only.

By The Peptides Codex Editorial TeamReviewed July 10, 2026
Length
2 aa
Class
Synthetic dipeptide immunomodulator (Khavinson class)
Function
Short synthetic dipeptide studied for effects on T-cell differentiation and immune signalling
Context
Investigational bioregulator studied in Russian immunology and aging research; not authorized by Health Canada

A two-residue peptide isolated from thymalin — the minimal fragment credited with much of its immune activity.

Also known as: glutamyl-tryptophan · L-Glu-L-Trp · thymagen

Part of the Neuropeptides & signaling cluster

Overview

Thymogen is a synthetic dipeptide, L-glutamyl-L-tryptophan (Glu-Trp), from the Khavinson family of short-peptide bioregulators. Identified as an active fragment of the thymic extract thymalin, it has been studied for effects on immune cell differentiation in Russian research. It is not authorized by Health Canada, and this page is educational only.

Source & context

Biological / chemical source: Synthetic dipeptide originally identified as an active fragment of the thymic preparation thymalin

Primary research or clinical context: Investigational bioregulator studied in Russian immunology and aging research; not authorized by Health Canada

A minimal bioregulator

Thymogen was obtained by isolating the active dipeptide Glu-Trp from the natural thymic preparation thymalin, then producing it synthetically. It is one of the smallest Khavinson peptides and is studied for reported effects on T-cell maturation and immune signalling. Its size makes it a striking example of the hypothesis that very short peptides can carry regulatory information.

Evidence and regulatory status

Reported studies, largely from Russian institutes, describe immunomodulatory and geroprotective effects in rodent models, with limited independent Western replication. Thymogen is investigational, sold for research use only in most markets, and is not authorized by Health Canada. This page is educational and makes no claim that it is safe, effective or therapeutic.

FAQ about Thymogen

What is Thymogen?+

Thymogen is a synthetic dipeptide, L-glutamyl-L-tryptophan (Glu-Trp), from the Khavinson family of short-peptide bioregulators. Identified as an active fragment of the thymic extract thymalin, it has been studied for effects on immune cell differentiation in Russian research. It is not authorized by Health Canada, and this page is educational only.

Is Thymogen an approved medicine?+

Thymogen is discussed here as a research / educational topic. Investigational bioregulator studied in Russian immunology and aging research; not authorized by Health Canada. This is not medical advice.

What is the typical length of Thymogen?+

Thymogen is commonly described as approximately 2 amino acids (Synthetic dipeptide immunomodulator (Khavinson class)).

Related peptides

References & further reading

  1. 1.Biogerontology — Immunomodulatory synthetic dipeptide L-Glu-L-Trp slows down aging and inhibits carcinogenesis in rats
  2. 2.PMC — Peptides as epigenetic modulators: therapeutic implications (Khavinson peptides review)
Disclaimer: Educational content only. Not medical advice. Not instructions for human use. Research peptides and unapproved products may be restricted or illegal to market for human consumption in your jurisdiction. Consult qualified professionals and applicable law.
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Cite this: Peptides Codex — Thymogen educational profile.
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