What was inside the analyzed sample?
A chemistry laboratory, not a treatment clinic
What did they want to find out?
Was the sample full thymosin beta-4 or a shorter fragment?
What did researchers observe?
Researchers identified an acetylated seven-amino-acid fragment.
What does this mean for you?
This is an identity result: it tells us about that sample, not whether taking it helps a person.
What we still do not know
The identity and quality of any current product were not tested.
Show study details
Original sources checked on 4 October 2026. AI-assisted editorial summaries, not a systematic review or an independent medical assessment.
Synthesis and characterization of the N-terminal acetylated 17-23 fragment of thymosin beta 4 identified in TB-500, a product suspected to possess doping potential
Drug Testing and Analysis · 2012
How it was studied
Chemical identification and synthesis study. A TB-500-labeled laboratory sample and a synthesized reference peptide; no treated patients.
Study finding
The analyzed material contained Ac-LKKTETQ, an acetylated seven-amino-acid fragment of thymosin beta-4.
Study limitations
Identifying one sample does not prove human recovery benefits, current vial identity or quality. The fragment is not full-length thymosin beta-4.
Who is behind the study?
- Identified authors
- Simone Esposito, Koen Deventer, Jan Goeman, Johan Van der Eycken, Peter Van Eenoo
- Funding and involvement
- Not confirmed from the accessed source sections.
- Disclosed interests and verification limits
- The authors list Ghent University laboratories. Formal author-interest declarations were not confirmed; university affiliation does not establish financial independence.
Terms explained
- Fragment
- A shorter part of a larger molecule.
- Acetylated
- Carrying a particular small chemical group; this can matter when comparing molecules.
Read the source and its limitations. A reference does not automatically validate a commercial product.
Read the source