| Compound | Thymosin Alpha-1 |
|---|---|
| Category | Immunomodulatory thymic peptide |
| Class | Healing and Anti-Inflammatory Peptides |
| Evidence tier | Approved medicine |
| WADA status | Not individually listed; verify current status if subject to testing |
| Sold on this site | No — this is a reference database |
Overview
Thymosin Alpha-1 — a immunomodulatory thymic peptide — sits in the "Approved medicine" tier of this catalog. This compound exists as an approved medicine in at least one major jurisdiction. Approval applies to specific, labeled indications and to the regulated product — not to compounded or research-grade copies.
A thymic peptide approved in several countries — notably as Zadaxin — as an adjunct in chronic hepatitis B and as an immunomodulator, though it is not FDA-approved in the United States.
Mechanism of Action
Thymosin alpha-1 is thought to modulate dendritic cell and T-cell function, promoting a more effective adaptive immune response. Its approved uses leverage this immunomodulation in viral hepatitis and, in some markets, as a vaccine adjuvant.
Research and Evidence
Clinical trial literature includes randomized studies in chronic hepatitis B and trials in sepsis and other immune contexts, with heterogeneous results. Regulatory approval varies widely by country.
Safety and Side Effects
Approved formulations have a generally tolerable profile (injection-site reactions are the most common complaint). Unregulated "research" versions carry none of the manufacturing assurances of the registered product.
Frequently Asked Questions
What is the evidence tier of Thymosin Alpha-1?
Thymosin Alpha-1 is graded "Approved medicine" on this site. This compound exists as an approved medicine in at least one major jurisdiction. Approval applies to specific, labeled indications and to the regulated product — not to compounded or research-grade copies.
Is Thymosin Alpha-1 an approved medicine?
Thymosin Alpha-1 exists as an approved medicine in at least one major jurisdiction — but approval covers the regulated product and its labeled indications only. Compounded or research-grade versions of the same molecule are not the approved product.
Where can I read the primary studies for Thymosin Alpha-1?
The references section at the end of this entry links the key primary sources — regulator labels, trial registrations, and peer-reviewed papers. Our "How to Read a Peptide Study" guide explains how to evaluate them.
References
- ClinicalTrials.gov — registered thymosin alpha-1 studies. [source]
Evidence tier: Approved medicine · Last reviewed: 2026-09-05 · Sources cited below.