What is Thymalin?
The short answer
Thymalin is a protein.
What it is
Thymalin: Calf-thymus polypeptide extract.
Mixture of peptides from calf thymus, studied as an immune modulator.
What people look into
Aging
- 4 sources
- Status as of
- How we source
- Ellum doesn't sell peptides.
Get updates on Thymalin
What it is
- Also known as
- thymaline, timalin, tymalin
- How it works
- Mixture of peptides from calf thymus, studied as an immune modulator.
Regulatory status
Approved outside the US How we label status
As of October 4, 2026, Thymalin is not FDA-approved for any use and is not on FDA's 503A bulks list.
- Federal (FDA)
- Not FDA-approved (no drugsfda/DailyMed record)
- 503A compounding
- No category; not on 216.23 as of 2026-10-07 (as of October 7, 2026)
- WADA 2026
- Not named; approved in Russia, so S0 does not apply
US enforcement actions
1 US enforcement action, in 2024.
Actions by US federal and state agencies whose documents name Thymalin. Each row links to the government's own document.
Scroll sideways to see all columns.
US enforcement actions table
| Date | Agency | Action | Document |
|---|---|---|---|
| FDA | Warning letter | FDA document, warning letter, February 7, 2024, on fda.gov |
References
Sources as of October 4, 2026