Most available support is preclinical, mechanistic or anecdotal. Human efficacy and long-term safety are not established.
Overview
TB-500 is a synthetic peptide related to Thymosin Beta-4 (Tβ4), a naturally occurring protein involved in cell migration and tissue repair. It is frequently paired with BPC-157 in online 'recovery' discussions.
How It's Thought to Work
Thymosin Beta-4 regulates actin, a protein central to cell structure and movement, which may influence wound healing, blood-vessel formation, and inflammation. TB-500's activity in humans is not well characterized.
What the Research Says
Most evidence is preclinical (animal and cell studies) on wound healing and cardiac tissue. Human clinical evidence for the injectable 'TB-500' sold online is minimal.
Key studies to start with
Investigational Peptides in Orthopaedic Practice: Evidence, Safety, and Patient Counseling for BPC-157, Thymosin Beta-4, and TB-500
The Journal of the American Academy of Orthopaedic Surgeons · 2026 Oct 27
PubMedEfficacy of probiotics combined with tacrolimus ointment in children with atopic dermatitis and its effects on serum IgE, IL-4, and LTB4: A single-center retrospective cohort study
Medicine · 2026 Sep 18
PubMedEffects of BPC-157 and TB-500 on Achilles tendon healing in rats: A histopathological and biomechanical study
Joint diseases and related surgery · 2026 Jul 23
Regulatory & Legal Status
Not approved by the FDA for human use. Prohibited in sport by WADA. Sold as a research chemical.
Safety Considerations
Limited human safety data. Unregulated purity in research-chemical markets. Consult a qualified clinician before considering use.