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Peptide
Thymosin alpha-1
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Approval
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Immune-peptide terms and care questions
Thymosin alpha-1: what is its US status?
Thymosin alpha-1
Thymosin alpha-1 is the name of one peptide. Thymalfasin is another name for the same substance.
FDA (Food and Drug Administration) reviews medicines for US approval.
Is there an FDA-approved product?
The September 26, 2026 US check found no approved thymosin alpha-1 product.
The sources in this guide do not establish what benefit it would give your body’s defense against illness. Ask what health problem it would treat and which study in people supports that use.
Ask to see the record for the exact product being discussed.
What about approval in another country?
The September 26, 2026 records confirm that Italy authorizes thymosin alpha-1.
That Italian record does not give the treatment FDA approval in the US.
Ask which country, which product, and which use a claim of approval refers to.
Did a withdrawn request clear it for made-to-order medicine?
No. People or groups had asked FDA to consider thymosin alpha-1 as an ingredient for medicines made to order. FDA’s April 22, 2026 page records that they took the request back.
FDA still lists safety concerns for it. Taking the request back is not FDA approval.
Unpack the word “withdrawn”
Ask it plainly: “Does this exact product have FDA approval? If not, what rule allows you to supply it?”
Behind this care answer
FDA: application records
FDA: ingredient requests that were taken back
Read the next topic.
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