Independent · non-commercial · publishes on a quarterly cycle|Current cycle 2026 Q3
Compound Evidence InstituteEvidence synthesis · established 2023Graded assessments of compounds, trials, methods and supply
Document set current to 30 July 2026
Compound monograph · §5

Thymosin alpha-1 — regulatory status

Authorisation status by jurisdiction, development status, and the distinction between an authorised product and research supply.

Document identifier
CEI-MN-040/5
Series
Compound monograph
Version
4.2
Published
23 Jan 2026
Last reviewed
23 Jan 2026
Next review
23 Jan 2028
Identifier
10.71829/cei.mono.40
Certainty
Moderate
Cycle
2026 Q1

§5Regulatory status

§5.1Status by jurisdiction

Table 5. Regulatory status of Thymosin alpha-1 by jurisdiction, as recorded at the assessment date.

JurisdictionStatusDetail
Italy, China, Japan and more than thirty other countriesApprovedThymalfasin, for chronic hepatitis B and C, as a vaccine adjuvant, and in some jurisdictions in sepsis and oncology support
United StatesNot approvedOrphan designation was granted for certain indications; no marketing authorisation
European UnionNationally authorised in some member statesNot centrally authorised
Research-use supplyNot approvedOffered by many suppliers
Recorded at the assessment date. Regulatory status changes and this table is re-examined at each review.

§5.2Development status

Approved. Holds a marketing authorisation for at least one indication in at least one jurisdiction.

Table 6. Published trials held by the Institute for this compound, by phase.

PhaseTrialsIdentifiers
Phase 21TA1-VACCINE-ELDERLY
Phase 33TA1-HBV-1 · TA1-HCV-1 · TA1-SEPSIS-CN

§5.3Supply outside authorisation

Material offered by research-chemical suppliers is not manufactured under a marketing authorisation, is not subject to the quality system that governs an authorised product, and is not covered by any pharmacovigilance obligation. The distinction matters for this monograph because every efficacy and safety estimate reproduced in §3 and §4 was obtained using material manufactured under such a system. The Institute records supply considerations separately at §8 and analytical characterisation at §6.[1,2]

References cited on this page

References are numbered in order of first citation in this document. Each superscript in the text links to its entry below.

  1. International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use. ICH Q6B Specifications: Test Procedures and Acceptance Criteria for Biotechnological/Biological Products. ICH Harmonised Tripartite Guideline 1999;Step 4 version. identifier not held by the Institute
  2. Sodhi M, Rezaeianzadeh R, Kezouh A, Etminan M. Risk of gastrointestinal adverse events associated with glucagon-like peptide-1 receptor agonists for weight loss. JAMA 2023;330(18):1795–1797. doi:10.1001/jama.2023.19574 · PMID 37796527

Identifiers are reproduced only where the Institute holds them. Where a digital object identifier or PubMed identifier is not shown, the Institute has recorded the journal and year and has not constructed an identifier.

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