Approval
The US record
The Food and Drug Administration (FDA), the US agency for drugs, had approved no medicine containing thymosin alpha-1 as of September 28, 2026.
Read the FDA assessmentPlain-language guide / Welcome desk
Thymosin alpha-1 therapy, explained.
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Thymosin alpha-1 is a peptide: its short chain is made of the building blocks of proteins. Its man-made form is called thymalfasin.
The starting point
A name is only the beginning.
Evidence
Does it help people?
In its 2024 review, the FDA could not tell from the studies whether thymosin alpha-1 helped people with any of the health problems it checked. These included liver infections, COVID, cancers and serious reactions to infection.
Read the research reviewCost
Ask for the full quote
No US manufacturer’s list price can be given for it as of September 28, 2026, because no US product has approval.
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