Peptide fragment (Thymosin β4)

TB-500 (Thymosin β4)

A synthetic fragment of Thymosin β4 studied for cell migration and tissue repair.

Mostly preclinical

At a glance

Sequence
Active fragment of the 43-aa Thymosin β4 protein
Molecular weight
CAS
Class
Peptide fragment (Thymosin β4)
Aliases
Thymosin beta-4 fragment

Overview

Based on the actin-regulating region of Thymosin β4, a protein found in nearly all cells.

Studied for wound healing, angiogenesis and cardiac repair. Often paired with BPC-157 in recovery research.

Mechanism

Regulates actin, promoting cell migration, angiogenesis and reduced inflammation at injury sites.

Research

What the studies show

Quantification of TB-500 and metabolites by high-resolution MS

Rahaman KA, et al. · Journal of Chromatography B · 2024 · Analytical/preclinical

Quantifies TB-500 and its metabolites by high-resolution MS and screens wound-healing activity in vitro.

NL005 Recombinant Thymosin β4 for Acute Myocardial Infarction

ClinicalTrials.gov (NCT07586865) · Clinical trial registry · 2026 · Clinical trial registry

A currently registered human trial applying recombinant Thymosin β4 in heart-attack patients; outcomes pending.

Thymosin β4-pretreated cell transplantation in STEMI

Zhu J, et al. · Cytotherapy · 2016 · Human

Thymosin β4-pretreated cell transplantation in STEMI patients; small early-phase safety/efficacy signal.

Thymosin β4 accelerates re-epithelialisation

Malinda KM, et al. · FASEB Journal · — · Foundational

Showed Thymosin β4 accelerates re-epithelialisation and wound closure; the mechanistic bedrock for later TB-500 work.

Neuroprotection against prion-fragment toxicity

Song K, et al. · European Journal of Pharmacology · 2020 · Preclinical

Thymosin β4 protected human brain endothelial cells from prion-fragment toxicity, supporting a neuroprotective angle.

Evidence summary

Grounded in the well-established biology of Thymosin β4, a repair protein found in nearly every cell, with a strong preclinical foundation in wound healing, cell migration and cardiac repair. Human research is now advancing, including a newly registered clinical trial - a compound moving steadily from established science toward the clinic.