What it is
A synthetic peptide fragment related to thymosin beta-4, a naturally occurring 43-amino-acid actin-binding protein. Supplied as a lyophilized powder.
How it works
Thymosin beta-4 binds G-actin and may influence cell motility, angiogenesis, and inflammation in preclinical models; the fragment TB-500 is hypothesized to share some properties.
Where it's used
Studied in preclinical research for effects on cell migration and tissue repair.
Regulatory status
Not FDA-approved; research compound.
Reconstitution
Supplied as a lyophilized powder requiring reconstitution with bacteriostatic water prior to use.
Tracking it
TB-500 is injectable, so two things matter in a log: when you dosed and where. Rotating sites and writing both down prevents the classic “did I already pin the left side?” problem.
Source
Public reference
Last reviewed 2026-06-11