Thymosin Beta-4
Thymosin Beta-4 (TB4) is the complete, towering 43-amino-acid parent molecule from which TB-500 is derived. Naturally ubiquitous in almost all human cells, it is the absolute biological master of cellular repair and cytoskeletal regeneration. In elite clinical protocols, full-length TB4 is deployed to force the aggressive healing of catastrophic cardiac tissue post-myocardial infarction, rapidly regenerate shattered corneas, and orchestrate the systemic repair of torn muscles, tendons, and ligaments.
Quick Stats
Scientific Data
Mechanism of Action
Thymosin Beta-4 (Tβ4) is a highly conserved, naturally occurring 43-amino acid peptide found in virtually all animal cells (especially high in platelets). It is the primary actin-sequestering molecule in human cells — binding to G-actin monomers to regulate the cell cytoskeleton assembly, which is essential for cell shape, motility, and migration.
Upon tissue injury, Tβ4 is released to promote angiogenesis, stem cell migration to the injury site, and wound healing. It modulates inflammatory cytokines and prevents apoptosis. In sports and regenerative medicine, TB-500 (a synthetic fragment containing its active region) is often favored, though the full 43-AA Thymosin Beta-4 is heavily studied in clinical trials for dry eye syndrome, epidermolysis bullosa, and post-MI cardiac repair.
Source: PMID: 20514133
Background & History
Thymosin Beta-4 is the most abundant member of the beta-thymosin family, present in virtually all nucleated cells at concentrations of 0.1-0.5 mM. TB-500, the widely used research peptide, is actually a 17-amino-acid fragment of this 43-amino-acid molecule. Full-length Tβ4 has been studied for cardiac repair (RegeneRx Biopharmaceuticals), corneal wound healing (RGN-259 eye drops), and epidermolysis bullosa. It represents one of the most promising endogenous repair molecules.
Research Use Cases
- ✓Cardiac repair post-MI
- ✓Corneal wound healing
- ✓Hair regrowth
- ✓Chronic wound healing
- ✓Epidermolysis bullosa
Dosing Protocol
| Typical Dose | 750-2000 mcg/day |
| Frequency | 1× daily for 10-20 days |
| Half-Life | 2 hours |
| Common Vial Sizes | 5 mg |
Dosing Protocols
Systemic Regeneration / Injury
Body-Weight Dosing Reference
Estimated doses extrapolated from the published research range of 750–2000 mcg/day (referenced to 70 kg / 154 lb). These are approximations — consult a qualified healthcare provider for personalised guidance.
| Weight | Low Dose | Target Dose | High Dose |
|---|---|---|---|
| 120 lb(54 kg) | 579 mcg | 1061 mcg | 1543 mcg |
| 140 lb(63 kg) | 675 mcg | 1238 mcg | 1800 mcg |
| 160 lb(73 kg) | 782 mcg | 1434 mcg | 2086 mcg |
| 180 lb(82 kg) | 879 mcg | 1611 mcg | 2343 mcg |
| 200 lb(91 kg) | 975 mcg | 1788 mcg | 2600 mcg |
| 220 lb(100 kg) | 1071 mcg | 1964 mcg | 2857 mcg |
| 250 lb(113 kg) | 1211 mcg | 2220 mcg | 3229 mcg |
💉 For exact syringe units based on your vial concentration, use the Thymosin Beta-4 Reconstitution Calculator →
Administration
Expected Timeline
Who Is It For?
Soft Tissue Repair / Tendons
ModeratePromotes actin-mediated cell migration to injury sites. Wide anecdotal and preclinical support.
Cardiac / Ischemia Recovery
LowClinical trials evaluating efficacy in protecting myocardium post-heart attack.
Reconstitution Example
Safety & Considerations
Research compound in many jurisdictions. Do not use in individuals with active malignancy, as it promotes angiogenesis and cell migration (which could theoretically aid tumor metastasis).
Regulatory & Legal Status
Not currently on the WADA 2026 Prohibited List. Policies may change — verify before competition.
Research Chemical
US Compounding: Not eligible / not available
⚠️ This information is for educational purposes only and may not reflect the most current regulatory updates. Always verify with official FDA, WADA, and jurisdiction-specific sources before use.
Interactions & Contraindications
Research compound — no established drug interactions. Theoretical concern with tumor promotion in predisposed individuals (actin dynamics role in metastasis) though not observed in clinical studies.
Synergies & Common Stacks
TB-500 is the fragment; full-length Tβ4 contains the complete molecule. Some practitioners use both at different phases of recovery.
Tβ4 + BPC-157 targets distinct repair pathways: Tβ4 for actin dynamics/cell migration, BPC-157 for angiogenesis and GH receptor upregulation.
Dosing Quick Reference
Frequently Asked Questions
Is Thymosin Beta-4 the same as TB-500?▼
References
- Goldstein AL et al. “"Thymosin beta4: actin-sequestering protein moonlights to repair injured tissues".” Trends in Molecular Medicine (2012). PMID: 22115354
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