Thymosin Alpha-1: Patient Information & Safety Notes
Also known as TA1, Zadaxin, Thymosin alpha 1
Other names: ta1, zadaxin, thymalfasin
Thymosin alpha-1 (thymalfasin, brand: Zadaxin) is a synthetic 28-amino-acid peptide that modulates immune function by stimulating T-cell maturation and natural killer cell activity. It is approved for hepatitis B and C in some countries outside the US. It is not FDA-approved in the United States for standard indications.
In plain language
What Thymalfasin is used for
- Investigated for immune support in chronic infections, cancer adjunct therapy, and autoimmune regulation
Taking this medicine
How it is administered
- Subcutaneous injection
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Risks and precautions
Risks and warnings
- Headache
- Mild allergic reactions or flu-like symptoms
- Injection site irritation
Who should not take it
- History of organ transplant (immune stimulation may risk rejection)
- Active severe flare of autoimmune disorder
- Pregnancy
Common questions
Patient questions
Is thymosin alpha-1 FDA-approved in the United States?
No. Thymosin alpha-1 (Zadaxin) is approved in some countries but is not FDA-approved for routine therapeutic use in the United States.
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This information is educational — not medical advice.
This page is provided for general educational purposes and summarizes publicly available data from sources such as the U.S. Food & Drug Administration. It is not a substitute for the judgment of a licensed clinician and should not be used to start, stop, or change any medication. It may be incomplete or out of date, and individual circumstances vary. Always talk with your prescriber or pharmacist about your specific medications and health conditions. If you think you may have a medical emergency, call 911.
Sources & References
Learn more about where our data comes from and how we write and review medical content.