TB-500 (Thymosin Beta-4)
A synthetic analogue of Thymosin Beta-4, a naturally occurring peptide present in virtually all human cells. Regulates actin polymerisation, enabling rapid cell migration to injury sites and systemic tissue repair throughout the body.
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BiohackingHub Research TeamEditorial Research Team · Last updated: March 1, 2026
Medical Disclaimer: The information on this page is for educational and research purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment.
Mechanism of Action
TB-500 is a synthetic analogue of Thymosin Beta-4 (Tβ4), a 43-amino acid peptide present in virtually every cell of the human body at high concentrations. It is one of the most abundant peptides in mammalian tissue.
Key mechanisms:
- Actin polymerisation regulation — Tβ4 sequesters G-actin, controlling the balance between monomeric and filamentous actin. This directly governs cell motility — the foundation of tissue repair
- Systemic stem cell mobilisation — unlike BPC-157, TB-500 acts systemically, mobilising stem cells and progenitor cells from bone marrow to injury sites throughout the body
- Angiogenesis — stimulates new blood vessel formation in ischaemic tissues
- Anti-inflammatory action — reduces inflammatory cytokines, accelerating the transition from the inflammatory phase to the proliferation phase
TB-500 vs BPC-157: Key Differences
| TB-500 | BPC-157 | |
|---|---|---|
| Action | Systemic | Primarily local |
| Primary mechanism | Actin regulation, cell migration | VEGF, GH receptor upregulation |
| Best for | Multiple injuries, systemic inflammation | Specific injury, gut issues |
| Dosage | 2–10 mg | 250–1000 mcg |
| Injection site | Subcutaneous, any site | Near injury site for best effect |
Why the Stack Works
The TB-500 + BPC-157 combination covers both levels of repair simultaneously: TB-500 mobilises repair cells from across the body, while BPC-157 creates the optimal local environment at the injury site.
[2]Related Research
Stacking Interactions
How TB-500 (Thymosin Beta-4) interacts with other compounds
The classic Wolverine Stack. Load both together for 4–6 weeks for acute injury. Most practitioners inject both on the same day.
Safety Profile — Tier B
Generally safe — moderate evidence
Contraindications
- ●Active malignancy (promotes angiogenesis and cell migration)
- ●Pregnancy
Side Effects
- ●Head rush or mild dizziness post-injection
- ●Fatigue for 1–2 hours after administration
- ●Mild nausea