Thymosin Alpha-1 vs TB-500: Which Is Right for You?
Quick verdict Thymosin alpha-1 (Zadaxin) is approved in many countries for immune modulation but is not FDA-approved in the US; its 503A Category 2 nomination was withdrawn. TB-500 (thymosin beta-4) is prohibited for compounding and is WADA prohibited. Neither
This comparison does not assign a generated winner or score.
- Quick verdict
- Thymosin alpha-1 (Zadaxin) is approved in many countries for immune modulation but is not FDA-approved in the US; its 503A Category 2 nomination was withdrawn. TB-500 (thymosin beta-4) is prohibited for compounding and is WADA prohibited. Neither is a straightforward legal option in the US for human use.