Research information · No products for sale
TB-500: Research Evidence and Safety Information
What is known – and unknown – about the thymosin beta-4 fragment sold as TB-500.
Published 20 October 2026 · Last reviewed 20 October 2026 · Editorial content by the Peptide Atelier UK team, not clinically reviewed
Editorial standards and corrections
TB-500 is not an authorised medicine in the UK. Peptide Atelier UK does not sell or supply it. This page is not medical advice; speak to a GP, pharmacist or other qualified healthcare professional.
What is TB-500?
TB-500 is a name used for synthetic peptides related to thymosin beta-4, a naturally occurring protein involved in cell movement and tissue repair processes. Products sold under the name vary in composition.
What is known
Thymosin beta-4 has been studied in laboratory and animal models, and in limited early-stage clinical research for specific medical uses. These studies do not establish that products sold online as TB-500 are safe or effective in people.
What remains uncertain
- Whether the products sold contain what they claim.
- Short- and long-term safety in humans.
- Effects in people with existing conditions.
Regulatory considerations
TB-500 is not authorised for human use in the UK and is prohibited in sport under the WADA Prohibited List. A 'research use only' label does not make a product safe for human use.