TB-500 (Thymosin Beta-4)

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. ^[]