Thymosin Beta-4 (TB-500)
Thymosin Beta-4 / TB-500 (Ac-SDKPDMAEIEKFDKSKLKKTETQ)
A 43-amino acid thymic peptide and master regulator of actin dynamics, tissue repair, and immune modulation. TB-500 (the synthetic form) is one of the most widely used peptides for injury recovery, with additional immune-balancing and anti-inflammatory properties.
Mechanism of Action
Thymosin Beta-4 sequesters G-actin monomers, regulating actin polymerization and cell motility critical for tissue repair. It promotes stem cell migration to injury sites, stimulates angiogenesis via upregulation of VEGF and HIF-1α, and reduces inflammation by inhibiting NF-κB and downregulating pro-inflammatory cytokines. In immune tissue, it promotes T-cell differentiation and thymic regeneration. It also activates cardiac progenitor cells for heart repair and reduces fibrotic remodeling post-injury. Its combination of direct tissue repair, immune modulation, and anti-inflammatory effects makes it uniquely versatile.
Health Claims & Evidence
Accelerates healing of muscle, tendon, ligament, and connective tissue injuries
Promotes cardiac repair and reduces post-infarction fibrosis
Anti-inflammatory — reduces NF-κB-driven cytokine production
Promotes angiogenesis and tissue vascularization
Supports thymic regeneration and T-cell immune function
Neuroprotection and CNS repair after injury
Short-Term Effects
Accelerated injury healing, reduced inflammation and pain, improved flexibility and range of motion.
Long-Term Effects
Complete tissue repair, reduced scar formation, improved cardiac and immune function, enhanced recovery capacity.
Side Effects
Generally well-tolerated. Rare: mild injection site reactions, transient fatigue. No significant adverse effects in research literature.
Contraindications
Theoretical caution in active malignancy due to angiogenic effects. Limited data in pregnancy.
This profile is provided for educational research only. It is not a treatment recommendation or dosing guide. Human evidence, safety information and regulatory status vary by substance. Verify primary sources and consult a qualified healthcare professional for medical decisions.
Research Papers
Thymosin beta-4 promotes cardiac repair after myocardial infarction
Bock-Marquette I et al. · Nature · 2004
TB4 accelerates wound healing and reduces inflammation
Malinda KM et al. · FASEB Journal · 1999
Thymosin beta-4 and thymic regeneration
Goldstein AL et al. · Annals of the New York Academy of Sciences · 2012
Educational research only. This profile is not a treatment recommendation or dosing guide. Human evidence, safety information and regulatory status vary by substance. Consult a qualified healthcare professional for medical decisions.
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