Immunomodulatory

Thymalin

Research Reagent · Laboratory Use Only

Quick Answer

What is the difference between Thymalin and Thymulin?

Thymalin is a polypeptide complex extracted from bovine thymus tissue and used clinically in Russia for immunomodulation. Thymulin is a separate, synthetic nonapeptide. Despite the similar name, they have different compositions and mechanisms. Thymalin restores CD4+/CD8+ T-cell ratios in immunosenescent populations.

PMID12698495↗DOI10.1023/A:1023980032862↗⟳ Reconstitution Calculator
Scientific AbstractPMID 12698495 · 2003

Thymalin is a polypeptide complex extracted from calf thymus tissue, distinct in composition and mechanism from synthetic Thymulin. Research, largely from Russian and Eastern European literature, demonstrates Thymalin's effects on T-lymphocyte differentiation, restoration of CD4+/CD8+ ratios in immunosenescent populations, and modulation of cytokine profiles. Clinical investigation has focused on age-related immune dysfunction, chronic infectious diseases, and post-surgical immune recovery. Thymalin is approved for medical use in the Russian Federation but is not FDA-approved.

Source:10.1023/A:1023980032862
Mechanistic Research SummaryCurated from PubMed

This data is for laboratory research purposes only. Not for human or animal consumption.

What is Thymalin?

Thymalin is a polypeptide complex isolated from bovine thymus gland, distinct from the synthetic peptide Thymulin despite the similar name. It is approved in Russia for clinical immunomodulation but is not FDA-approved.

Mechanism of Action

Thymalin acts on T-lymphocyte populations, supporting maturation of CD4+ helper and CD8+ cytotoxic T-cell subsets and restoring physiological ratios in immunosenescent populations. Cytokine modulation includes shifts in IFN-γ, IL-2, and IL-4.

Observed Laboratory Results

  • CD4+/CD8+ ratio restoration in older adult populations
  • T-cell differentiation support in immunosenescent models
  • Cytokine profile normalization in chronic infection models
  • Distinct from synthetic Thymulin in composition and mechanism
Clinical Research Parameters
2 human studies

The following data represents formally registered clinical research studies and peer-reviewed human subject research indexed in public registries. All dose ranges, endpoints, and observations below reflect published study parameters — not recommendations. For research reference only.

Research Compliance Notice

All data presented on this page is for laboratory research purposes only. Thymalin is referenced here as a research reagent. This page does not constitute medical advice, clinical guidance, or endorsement of any compound for human or animal use. All referenced studies are available via PubMed (PMID: 12698495) and the DOI-linked journal publication. Researchers must consult applicable institutional and regulatory frameworks before conducting any protocols.

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Research Articles

Thymalin in the Research Blog

Thymosin Alpha-1, Thymulin, and Thymalin: Thymic Peptide Family
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