TB-500
Preclinical ResearchThymosin Beta-4 Fragment (TB-500)
A synthetic fragment of Thymosin Beta-4, studied for its role in cellular migration and repair.
Dose
2mg to 5mg
Route
Subcutaneous injection
Cycle
4-8 weeks for a loading phase, followed by a maintenance phase of varying duration (e.g., 2-4 weeks or longer)
Storage
Refrigerated (2C to 8C) for up to 2 years, or -20C for longer term. Protect from light.
What is TB-500?
TB-500 is a synthetic peptide fragment corresponding to a portion of the naturally occurring protein Thymosin Beta-4 (Tβ4). Tβ4 is a ubiquitous, highly conserved protein found in virtually all mammalian cells and plays a critical role in cell migration, angiogenesis, cell differentiation, and actin sequestration. TB-500 is studied for its ability to mimic these regenerative and protective properties, particularly in the context of tissue repair and recovery from injury. Research indicates it can promote wound healing, reduce inflammation, encourage new blood vessel formation, and improve flexibility by supporting tissue remodeling.
Key Benefits
- Soft-tissue repair
- Reduced systemic inflammation
- Improved flexibility
Mechanism of Action
- Actin sequestering
- Promotes cell migration
Best For
- Chronic injury
- Full-body recovery
Body Systems

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Molecular Information
Molecular weight
4963.44 g/mol
Length
43 amino acids (TB-4) - TB-500 is a synthetic fragment
Type
Synthetic Peptide Fragment
Amino acid sequence
Ac-Ser-Asp-Lys-Pro-Asp-Met-Ala-Glu-Ile-Glu-Lys-Phe-Asp-Lys-Ser-Lys-Leu-Lys-Lys-Thr-Glu-Thr-Lys-Glu-Lys-Gln-Ala-Gly-Glu-Ser-OH
TB-500 is commonly understood as a synthetic analogue corresponding to the amino acid sequence fragment 1-4 of Thymosin Beta-4, though the precise sequence for 'TB-500' can vary in research literature. The sequence above represents a common interpretation of the active region.
Pharmacokinetics
Time to peak
Unknown or highly variable depending on administration route and formulation; research suggests systemic distribution is relatively rapid.
Half-life
48 h
Time to clear
Elimination appears to be renal, with full clearance times not extensively detailed for the synthetic fragment but generally within days.
Based on observed biological activity windows and general peptide pharmacokinetics discussions in research literature.
Research Indications
Tendon and Ligament Injuries
Research indicates potential for accelerated healing and improved structural integrity in conditions such as tendinitis, sprains, and tears.
Muscle Tears and Strains
Studied for its role in promoting myogenesis and reducing inflammation, aiding in faster recovery of muscle tissue.
Wound Healing
Extensive research on its ability to promote epithelial migration, angiogenesis, and collagen deposition, leading to enhanced wound closure.
Research Protocols
| Goal | Dose | Frequency | Route |
|---|---|---|---|
| Acute Injury Healing (Loading Phase) | 4mg - 5mg | 2 times per week | Subcutaneous |
| Chronic Injury/General Repair (Loading Phase) | 2mg - 2.5mg | 2 times per week | Subcutaneous |
| Maintenance and Continued Healing | 2mg - 5mg | 1 time per week | Subcutaneous |
| Localized Injury (Targeted Administration) | 0.5mg - 1mg per site | Daily or every other day (often as part of larger weekly dose) | Subcutaneous (near injury site) or Intramuscular (near injury site) |
| General Wellness / Anti-aging (exploratory) | 2mg - 2.5mg | 1 time per week or every 2 weeks | Subcutaneous |
Loading phases often involve higher doses and frequencies to rapidly achieve desired systemic levels for acute injury repair. Maintenance phases utilize lower doses and frequencies to sustain therapeutic effects.
Peptide Interactions
- Synergistic
BPC-157
Often discussed together in research for their complementary roles in tissue repair and anti-inflammatory effects. BPC-157 focuses on gut and systemic healing, while TB-500 focuses on cellular migration and angiogenesis.
- Compatible
Growth Hormone Secretagogues (e.g., Ipamorelin, CJC-1295)
These compounds promote endogenous growth hormone release, which can further support overall tissue repair and recovery processes, potentially complementing TB-500's direct cellular actions.
- Monitor Combination
NSAIDs (Non-Steroidal Anti-inflammatory Drugs)
While potentially used concurrently for pain management, chronic high-dose NSAID use might theoretically interfere with some aspects of natural healing processes, though direct negative interactions with TB-500 are not widely documented.
- Use Caution
Immunosuppressants
Given TB-500's influence on cellular processes, using it alongside immunosuppressants requires careful consideration and monitoring, as it might theoretically modulate immune responses.
- Avoid
Cancer treatments (e.g., chemotherapy, radiation)
Due to theoretical concerns about TB-500's angiogenic and cell migratory properties potentially influencing tumor growth, it is generally recommended to avoid during active cancer treatment.
- Use Caution
Corticosteroids
Corticosteroids are potent anti-inflammatories but can also inhibit healing. Concurrent use may lead to conflicting biological signals regarding tissue repair and inflammation.
How to Reconstitute
- 1Gather materials: TB-500 vial, bacteriostatic water for injection, sterile syringe (e.g., insulin syringe), alcohol wipes.
- 2Carefully remove the cap from the TB-500 vial to expose the rubber stopper. Wipe the stopper with an alcohol wipe.
- 3Draw the desired amount of bacteriostatic water into the syringe (e.g., 1ml for a 5mg vial).
- 4Slowly inject the bacteriostatic water into the TB-500 vial, directing the stream down the side of the vial to avoid direct impact on the lyophilized powder.
- 5Do NOT shake the vial. Gently swirl the vial or place it in the refrigerator for 15-30 minutes to allow the powder to dissolve completely. Swirl again if necessary until the solution is clear with no particulate matter.
- 6Once reconstituted, store the vial in the refrigerator at 2C to 8C.
Bacteriostatic water for injection is generally preferred for reconstitution due to its preservative properties, which extend the shelf life of the reconstituted solution. Sterile water for injection can be used but typically results in a shorter shelf life for the reconstituted peptide.
What to Expect
- Weeks 1-2: Initial reports in research discussions sometimes include mild improvements in localized pain or discomfort, potentially due to anti-inflammatory effects.
- Weeks 2-4: Noticeable improvements in flexibility, range of motion, and reductions in chronic inflammation may begin to emerge, particularly in soft tissue injuries.
- Weeks 4-8: More significant signs of tissue repair, accelerated recovery from injury, and enhanced performance in physical activities are commonly reported in research settings.
- Beyond 8 weeks (Maintenance): Continued benefits in tissue health, injury prevention, and sustained recovery are often discussed with ongoing, lower-dose administration.
- Overall: The extent and speed of effects are highly dependent on the nature and severity of the injury being addressed, as well as individual response.
Side Effects & Safety
| Effect | Frequency | Severity |
|---|---|---|
| Head rush after injection | Occasional | Mild |
| Injection site redness | Occasional | Mild |
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