Thymalin vs Thymulin

Thymulin is a defined nine-amino-acid thymic hormone that needs zinc to be active; thymalin is a multi-peptide thymus extract.

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Thymalin

A polypeptide extract of calf thymus used as an immunomodulatory drug in Russia; its active short peptides (e.g. Lys-Glu) are studied as bioregulators.

BEST STUDIED FOR

Bioregulators

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	Thymalin	Thymulin
The key difference	Peptide extract	Zinc-dependent nonapeptide hormone
Class	Bioregulators	Repair & immune
Mechanism	Thymalin is described as restoring T-cell function and differentiation.	Thymulin needs bound zinc for activity; it promotes T-cell differentiation and interacts with the neuroendocrine system.
Status	Registered in Russia; outside that, evidence is largely from one research school and published mostly in Russian-language or niche journals.	Preclinical and physiological research; not an approved medicine.
Reported safety signals	Long clinical use in Russia is reported by its developers; independent safety data are limited.	No human therapeutic safety data.
A key study	Reported that thymalin activated differentiation of human haematopoietic stem cells in vitro. (Bull Exp Biol Med 2020, PMID 33237528)	Reviews thymulin production by thymic epithelium and its neuroendocrine regulation. (Curr Pharm Des 2014, PMID 24588820)

Thymulin for defined-hormone and zinc-dependence research; thymalin for extract-based bioregulator work. Both are discussed here strictly as research compounds; nothing on this page is medical advice or a dosing guide.

REFERENCES (PUBMED)

[Thymalin] Thymalin: Activation of Differentiation of Human Hematopoietic Stem Cells — Bull Exp Biol Med 2020. PMID 33237528
[Thymalin] The Influence of KE and EW Dipeptides in the Composition of the Thymalin Drug on Gene Expression and Protein Synthesis Involved in the Pathogenesis of COVID-19 — Int J Mol Sci 2023. PMID 37686182
[Thymalin] [Geroprotective effect of thymalin and epithalamin] — Adv Gerontol 2002. PMID 12577695
[Thymulin] Physiology and therapeutic potential of the thymic peptide thymulin — Curr Pharm Des 2014. PMID 24588820
[Thymulin] Thymulin, a zinc-dependent hormone — Med Oncol Tumor Pharmacother 1989. PMID 2657247
[Thymulin] Immunomodulatory role of thymulin in lung diseases — Expert Opin Ther Targets 2010. PMID 20055713

FREQUENTLY ASKED

What is the difference between Thymalin and Thymulin?

Thymulin is a defined nine-amino-acid thymic hormone that needs zinc to be active; thymalin is a multi-peptide thymus extract.

What is the regulatory status of Thymalin and Thymulin?

Thymalin: Registered in Russia; outside that, evidence is largely from one research school and published mostly in Russian-language or niche journals. Thymulin: Preclinical and physiological research; not an approved medicine.

What safety signals have been reported?

Thymalin: Long clinical use in Russia is reported by its developers; independent safety data are limited. Thymulin: No human therapeutic safety data.

Which studies is this comparison based on?

For Thymalin: “Thymalin: Activation of Differentiation of Human Hematopoietic Stem Cells” (PMID 33237528); “The Influence of KE and EW Dipeptides in the Composition of the Thymalin Drug on Gene Expression and Protein Synthesis Involved in the Pathogenesis of COVID-19” (PMID 37686182); “[Geroprotective effect of thymalin and epithalamin]” (PMID 12577695). For Thymulin: “Physiology and therapeutic potential of the thymic peptide thymulin” (PMID 24588820); “Thymulin, a zinc-dependent hormone” (PMID 2657247); “Immunomodulatory role of thymulin in lung diseases” (PMID 20055713).