TB-500
A naturally occurring peptide found in nearly all human cells that helps cells move and rebuild. It plays a key role in tissue repair, new blood vessel growth, and calming inflammation. One of the most powerful wound-healing peptides identified, with strong results in heart, skin, and eye repair.
TB-500 is a synthetic version of Thymosin Beta-4, a 43-amino-acid peptide naturally produced by the thymus gland and found in virtually all human cell types. It plays a fundamental role in tissue repair by upregulating actin — a protein critical for cell structure, migration, and proliferation. TB-500's primary advantage over other healing peptides is its systemic distribution: regardless of where it is injected, it travels throughout the body and concentrates at sites of injury.
Research has demonstrated TB-500's effects on wound healing, cardiac tissue repair after heart attack, reduction of scar tissue formation, and acceleration of muscle recovery. The peptide promotes cell migration to injury sites, stimulates blood vessel growth, reduces inflammatory cytokines, and has been shown to activate resident stem cells in damaged tissues. These properties make it particularly valuable for widespread or hard-to-reach injuries.
TB-500 is typically administered using a loading protocol: 2-5 mg subcutaneously twice weekly for 4-6 weeks, followed by a maintenance dose of 2-5 mg every 1-2 weeks. It is frequently combined with BPC-157, as the two peptides work through complementary mechanisms — BPC-157 promotes local healing while TB-500 provides systemic repair support.
Dosage
2-5 mg subcutaneous 2x weekly (loading) then 2-5 mg every 2 weeks
Dosages shown are for research reference only. Always consult a qualified healthcare provider.
Administration
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Effects
Tissue Repair
Broad-spectrum healing through actin-mediated cell migration to injury sites.
Anti-Inflammatory
Downregulates TNF-alpha, IL-1beta, and IL-6 while promoting resolution.
Angiogenesis
Promotes new blood vessel formation for improved healing blood supply.
Cardiac Repair
Activates cardiac progenitor cells and protects cardiomyocytes from ischemic injury.
Mechanism of Action
TB-500 is the active fragment of Thymosin Beta-4 (Tβ4), a 43-amino-acid peptide present in virtually every nucleated cell in the body. Its central molecular function is the sequestration of G-actin monomers — the globular, unpolymerized form of actin. By binding G-actin at a 1:1 ratio, TB-500 maintains a reservoir of monomeric actin that can be rapidly mobilized for polymerization into F-actin filaments when cells need to migrate, change shape, or form new structures during tissue repair.
This actin-regulating role is fundamental to TB-500's healing effects. When tissue is damaged, cells at the wound margin must migrate into the injury site. Cell migration requires dynamic actin polymerization at the leading edge of the cell (forming lamellipodia and filopodia) and depolymerization at the trailing edge. TB-500 facilitates this process by providing a controlled supply of G-actin monomers. It promotes migration of keratinocytes (for skin wound closure), endothelial cells (for new blood vessel formation), and cardiac progenitor cells (for heart repair).
Beyond actin regulation, TB-500 has significant anti-inflammatory and gene-regulatory effects. It downregulates pro-inflammatory cytokines including IL-1β, IL-6, and TNF-α while upregulating anti-inflammatory mediators. It activates cell survival pathways, specifically Akt-mediated anti-apoptotic signaling, protecting damaged cells from programmed cell death. TB-500 also promotes angiogenesis by stimulating endothelial progenitor cell differentiation and new capillary formation. In cardiac tissue, it has demonstrated the ability to activate epicardial progenitor cells and promote cardiomyocyte survival following ischemic injury. The combination of cell migration, anti-inflammation, angiogenesis, and cell survival makes TB-500 one of the most broad-spectrum healing peptides available.
Regulatory Status
Not FDA approved. Banned by WADA. Used in veterinary medicine for equine injuries. Available through compounding pharmacies and research suppliers.
Risks & Safety
Common
headaches, nausea, fatigue, injection site irritation, temporary lightheadedness.
Serious
may promote growth of existing cancerous cells by stimulating cell movement and new blood vessel growth; theoretical risk of speeding up undetected tumors.
Rare
allergic reactions, localized infection.
Compare TB-500 With
Research Papers
2Published: December 31, 2025
AI Summary
A broad review explains how wound-healing peptides like TB-500 support tissue repair, inflammation control, and nerve recovery in musculoskeletal care. While animal studies look promising, human clinical trials are still lacking.
Published: December 31, 2025
AI Summary
A primer for orthopaedic surgeons on injectable therapeutic peptides, given the growing market and patient interest. The paper emphasizes the need to understand current evidence before recommending these compounds.
Frequently Asked Questions
What is TB-500?
A naturally occurring peptide found in nearly all human cells that helps cells move and rebuild. It plays a key role in tissue repair, new blood vessel growth, and calming inflammation. One of the most powerful wound-healing peptides identified, with strong results in heart, skin, and eye repair.
What is TB-500 used for?
A naturally occurring peptide found in nearly all human cells that helps cells move and rebuild. It plays a key role in tissue repair, new blood vessel growth, and calming inflammation. One of the most powerful wound-healing peptides identified, with strong results in heart, skin, and eye repair.
What is the dosage for TB-500?
Loading: 2-5 mg subcutaneous twice weekly for 4-6 weeks. Maintenance: 2-5 mg subcutaneous every 2 weeks. Some protocols use daily dosing during acute injury phase.
What are the side effects of TB-500?
Common: headaches, nausea, fatigue, injection site irritation, temporary lightheadedness. Serious: may promote growth of existing cancerous cells by stimulating cell movement and new blood vessel growth; theoretical risk of speeding up undetected tumors. Rare: allergic reactions, localized infection.
How does TB-500 work?
TB-500 is the active fragment of Thymosin Beta-4 (Tβ4), a 43-amino-acid peptide present in virtually every nucleated cell in the body. Its central molecular function is the sequestration of G-actin monomers — the globular, unpolymerized form of actin. By binding G-actin at a 1:1 ratio, TB-500 maintains a reservoir of monomeric actin that can be rapidly mobilized for polymerization into F-actin filaments when cells need to migrate, change shape, or form new structures during tissue repair. This actin-regulating role is fundamental to TB-500's healing effects. When tissue is damaged, cells at the wound margin must migrate into the injury site. Cell migration requires dynamic actin polymerization at the leading edge of the cell (forming lamellipodia and filopodia) and depolymerization at the trailing edge. TB-500 facilitates this process by providing a controlled supply of G-actin monomers. It promotes migration of keratinocytes (for skin wound closure), endothelial cells (for new blood vessel formation), and cardiac progenitor cells (for heart repair). Beyond actin regulation, TB-500 has significant anti-inflammatory and gene-regulatory effects. It downregulates pro-inflammatory cytokines including IL-1β, IL-6, and TNF-α while upregulating anti-inflammatory mediators. It activates cell survival pathways, specifically Akt-mediated anti-apoptotic signaling, protecting damaged cells from programmed cell death. TB-500 also promotes angiogenesis by stimulating endothelial progenitor cell differentiation and new capillary formation. In cardiac tissue, it has demonstrated the ability to activate epicardial progenitor cells and promote cardiomyocyte survival following ischemic injury. The combination of cell migration, anti-inflammation, angiogenesis, and cell survival makes TB-500 one of the most broad-spectrum healing peptides available.
How is TB-500 administered?
TB-500 is administered via subcutaneous or intramuscular injection.
What is the half-life of TB-500?
The half-life of TB-500 is 2-3 hours.
Is TB-500 legal?
Not FDA approved. Banned by WADA. Used in veterinary medicine for equine injuries. Available through compounding pharmacies and research suppliers.
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