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Immunomodulatory peptide

Thymulin

Thymulin is a nonapeptide thymic hormone produced by thymic epithelial cells that requires a zinc ion for its biological activity and characteristic fold. It is studied for roles in T-cell differentiation and immune modulation. It is a research peptide and is not authorized by Health Canada for therapeutic use.

By The Peptides Codex Editorial TeamReviewed July 10, 2026
Length
9 aa
Class
Immunomodulatory peptide
Function
Zinc-dependent thymic hormone studied in T-cell research
Context
Immunology research (not authorized by Health Canada)

A rare peptide hormone that needs a bound zinc ion to fold and become active.

Also known as: zinc thymic factor · facteur thymique serique

Part of the Repair & recovery peptides cluster

Overview

Thymulin is a nonapeptide thymic hormone produced by thymic epithelial cells that requires a zinc ion for its biological activity and characteristic fold. It is studied for roles in T-cell differentiation and immune modulation. It is a research peptide and is not authorized by Health Canada for therapeutic use.

Source & context

Biological / chemical source: Thymic epithelial cells

Primary research or clinical context: Immunology research (not authorized by Health Canada)

Zinc dependence

Thymulin's defining feature is that it binds a Zn2+ ion to adopt its active three-dimensional structure; without zinc the peptide is biologically inactive. This zinc requirement makes it a notable example of a metal-dependent peptide hormone in immunology.

Immune-research role

Thymulin is studied for its influence on T-cell differentiation and natural-killer-cell activity, and can partially restore some T-cell functions in thymectomized animal models. Coverage here is educational and does not describe any approved therapeutic use.

FAQ about Thymulin

What is Thymulin?+

Thymulin is a nonapeptide thymic hormone produced by thymic epithelial cells that requires a zinc ion for its biological activity and characteristic fold. It is studied for roles in T-cell differentiation and immune modulation. It is a research peptide and is not authorized by Health Canada for therapeutic use.

Is Thymulin an approved medicine?+

Thymulin is discussed here as a research / educational topic. Immunology research (not authorized by Health Canada). This is not medical advice.

What is the typical length of Thymulin?+

Thymulin is commonly described as approximately 9 amino acids (Immunomodulatory peptide).

Related peptides

References & further reading

  1. 1.Wikipedia — Thymulin
  2. 2.PubMed — Thymulin, a zinc-dependent hormone
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 — Thymulin educational profile.
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