Thymulin
/ 9-amino-acid thymic peptide; biologically active only when bound to zincTIER 3 · PreclinicalN = 0 · TESTING PENDINGLAST REVIEW 2026·04·20
ALIAS · Zinc-bound thymulin · Facteur thymique sérique
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Suppliers
Research use onlyAny dose figures below describe what specific cited studies used, reported factually. Nothing on this page is guidance for human use.READ FIRST →
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§ A · Identity
Primary sequence— sequence not captured —
MW · —CLASS · 9-amino-acid thymic peptide; biologically active only when bound to zincCATEGORY · Healing
Historical European research interest in immunomodulation. Not FDA-approved. No pivotal Phase 3 program.
§ B · Mechanism of action
Thymulin is a 9-amino-acid peptide secreted by thymic epithelial cells. It is biologically active only when bound to zinc. Reported immunomodulatory effects include promotion of T-cell differentiation and regulation of Th1/Th2 balance.
§ C · Human clinical evidence
European academic research since the 1970s; no pivotal Phase 3 program and no FDA approval. Primarily a research tool in immunology.
§ H · Regulatory status
Regulatory status
- FDA status:
- Not FDA-approved
§ I · Notable gaps and controversies
Zinc-dependent activity complicates dosing and measurement. Therapeutic development has been limited despite decades of academic interest.