Evidence tools
Source check: follow the evidence trail
The short version
Each kind of record answers one kind of question. FDA’s approval records show whether a medicine is approved in the U.S. A trial registry is a public list of studies that are planned, running, or finished. It shows that a study exists, not what it found. A published study report shows what was found.
As of September 2026, the U.S. trial registry listed 64 thymalfasin studies, including studies still recruiting; registration shows that research exists, not that a treatment works.
Match the source to the claim
- For U.S. approval: search Drugs@FDA, FDA’s public list of approved medicines. An approved medicine also has an official label, the long printed sheet of directions and cautions.
- For whether a pharmacy may mix it: read FDA’s pages about the raw ingredients pharmacies use, such as the concern page linked below.
- For a study result: open the study itself (the Fact check page links to each one). Look at what the drug was compared with, how many people took part, and who paid for it.
- For a clinician or pharmacy licence: look it up on the website of the state board that licenses them.
- For price: ask for a dated, written quote that names what is included.
Two common source traps
As of September 2026, a listing in FDA’s drug code directory is not FDA approval. The thymosin alpha-1 entries found there were raw ingredient powder, not finished medicines.
As of September 2026, Italy has a prescription thymosin alpha-1 medicine authorized for a narrow use, but that foreign authorization does not make a product lawful to sell in the United States.