What is TB-500?
A plain-English, research-use-only guide to TB-500: what it is, its research-use status, and how to tell a verified source from a risky one.
- US vendors carry it
- 87
US vendors carry it
- Top certificate score
- 9.5/10
Top certificate score
What TB-500 is
TB-500 is a synthetic version of the active region of Thymosin Beta-4, a naturally occurring 43-amino-acid protein. It is commonly sold alongside BPC-157.
Research-use status
TB-500 is not an approved drug. Thymosin beta-4 is an actin-binding protein, and published work on the synthetic fragment is mostly animal and cell research; this guide does not summarise effects or uses. It is sold strictly for laboratory research use.
This describes research-use status only. It is not medical advice and says nothing about effects, uses or dosing. TB-500 is sold for laboratory research use only.
How to find a verified TB-500 source
TB-500 shows one of the widest price spreads of any peptide we track: the cheapest and priciest per-mg prices we recorded differ by more than 17×. A COA that confirms the peptide's identity is especially important here because sequence variants and blends are common in the market.
Compare 87 US TB-500 sources
See every vendor ordered by certificate score, then vendor score; Southern Aminos is listed first in our 2026 audit.
TB-500: Frequently Asked Questions
Is TB-500 the same as Thymosin Beta-4?
TB-500 is a synthetic fragment representing the active portion of Thymosin Beta-4, not the full native protein. Vendors sometimes use the names interchangeably, so check the COA for what was actually tested.