TB-500
TB-500 is a synthetic fraction of the naturally occurring mammalian protein Thymosin Beta-4 (Tβ4). It is a highly systemic, non-localized regenerative agent favored in clinical recovery protocols for its unparalleled ability to suppress chronic inflammation and facilitate soft tissue regeneration. Due to its extremely low molecular weight, TB-500 moves seamlessly through the bloodstream to target areas of acute trauma, making it a staple in advanced longevity clinics and elite athletics for healing muscle tears and ligament damage.
Quick Stats
Scientific Data
Mechanism of Action
TB-500 is a synthetic version of Thymosin Beta-4 (Tβ4), a 43-amino-acid protein naturally produced by the thymus gland. Its primary mechanism involves regulation of actin, a cell-building protein critical for cell migration, wound healing, and tissue repair. TB-500 promotes actin polymerization, enabling cells to migrate to injury sites more efficiently.
TB-500 also stimulates angiogenesis (new blood vessel formation), reduces inflammation, and promotes the formation of new muscle fibers. It has been studied extensively in equine medicine for tendon and ligament repair. Its systemic distribution means it does not need to be injected at the injury site — it locates and repairs damaged tissue throughout the body.
Source: PMID: 20435714
Background & History
Thymosin Beta-4 (Tβ4) was first identified in 1966 by Allan Goldstein at the National Cancer Institute as a thymic hormone involved in immune regulation. TB-500 is the synthetic form of the active region of Tβ4 (amino acids 17–23). It became widely studied in equine sports medicine in the 2000s after showing dramatic efficacy for tendon and muscle repair in racehorses, which led to its ban by racing authorities and subsequent interest in human applications.
Research Use Cases
- ✓Systemic tissue repair without site-specific injection
- ✓Cardiac muscle repair and protection post-ischemia
- ✓Reducing inflammation in chronic musculoskeletal conditions
- ✓Hair follicle regeneration and wound healing
- ✓Post-surgical recovery acceleration
Dosing Protocol
| Typical Dose | 2-5 mg twice weekly |
| Frequency | 2× weekly (loading), 1× weekly (maintenance) |
| Half-Life | ~2 hours (active metabolites longer) |
| Common Vial Sizes | 5 mg, 10 mg |
Dosing Protocols
Loading Phase (Weeks 1-6)
Maintenance
Body-Weight Dosing Reference
Estimated doses extrapolated from the published research range of 2000–5000 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) | 1543 mcg | 2700 mcg | 3857 mcg |
| 140 lb(63 kg) | 1800 mcg | 3150 mcg | 4500 mcg |
| 160 lb(73 kg) | 2086 mcg | 3650 mcg | 5214 mcg |
| 180 lb(82 kg) | 2343 mcg | 4100 mcg | 5857 mcg |
| 200 lb(91 kg) | 2600 mcg | 4550 mcg | 6500 mcg |
| 220 lb(100 kg) | 2857 mcg | 5000 mcg | 7143 mcg |
| 250 lb(113 kg) | 3229 mcg | 5650 mcg | 8071 mcg |
💉 For exact syringe units based on your vial concentration, use the TB-500 Reconstitution Calculator →
Administration
Expected Timeline
Who Is It For?
Muscle/Tendon Healing
HighExtensively studied in veterinary medicine for accelerating repair of injured tissues.
Anti-Inflammatory
ModerateObserved to reduce local and systemic inflammatory markers in experimental models.
Reconstitution Example
Safety & Considerations
TB-500 is a research peptide. It is not FDA-approved for human use. Animal studies show a favorable safety profile. Due to its angiogenic properties, TB-500 should not be used by individuals with active cancer. Use sterile injection practices.
Regulatory & Legal Status
Competitive athletes subject to anti-doping controls should not use TB-500.
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
Contraindicated with active malignancy due to angiogenic activity. May increase healing response in tissues with existing inflammation — start at lower end of dose range. No significant interactions with common medications documented in research.
Synergies & Common Stacks
Classic recovery stack: TB-500 provides systemic, body-wide healing via actin regulation; BPC-157 handles localized vascular and GI repair. Complementary mechanisms with additive effect.
IGF-1 LR3 promotes cellular proliferation while TB-500 facilitates migration of those cells to injury sites, enhancing overall regenerative capacity.
TB-500 vs. BPC-157
| Attribute | TB-500 | BPC-157 |
|---|---|---|
| Mechanism | Actin polymerization (systemic) | VEGF/FGF angiogenesis (localized) |
| Injection | Any site — distributes systemically | Near injury site preferred |
| Dose | 2–5 mg 2× weekly | 250–500 mcg 1–2× daily |
| Best For | Whole-body healing signals | Localized injury + GI healing |
| WADA Status | Prohibited (S0) | Prohibited (S0) |
Verdict: Stack both for maximum synergy: TB-500 handles systemic healing signals and cell migration while BPC-157 drives local angiogenesis and GI mucosal protection.
Featured In Clinical Protocols
Advanced Injury Healing
Accelerate the physiological regeneration of severely damaged tendons, ligaments, and muscle fibers by deploying angiogenic and cell-migration peptides.
Post-Surgical Accelerated Healing
Dramatically reduce post-operative recovery times, minimize scar tissue formation, and rapidly heal physical incisions and internal trauma.
Dosing Quick Reference
Frequently Asked Questions
What is the typical TB-500 dosing protocol?▼
How long does TB-500 take to work?▼
What is the difference between TB-500 and Thymosin Beta-4?▼
References
- Crockford et al. “"Thymosin beta-4 and its synthetic fragment TB-500 in tissue repair".” Annals of the New York Academy of Sciences (2010). PMID: 20388147
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