TB-500
Thymosin Beta-4 Synthetic Fragment — Recovery, Inflammation & Tissue Healing
Recovery & Anti-Inflammatory
Version 2025-04 · Last Reviewed April 1, 2025
About this review (v2025-04, last reviewed April 1, 2025): This review was compiled from published preclinical and clinical research, FDA regulatory documents, and compounding pharmacy guidance. No peptide vendor or manufacturer reviewed or approved this content. Read our full methodology
Educational content only. This page reflects published research and does not constitute medical advice. Peptides are not FDA-approved drugs (with limited exceptions noted). Consult a licensed healthcare provider before use. Dosing is intentionally omitted — it is determined by your provider based on individual labs and goals.
What it is
TB-500 is a synthetic peptide corresponding to the 17-amino-acid active fragment (Ac-SDKPDMAEIEKFDKSKLKKTET-NH2) of Thymosin Beta-4 (Tβ4), a naturally occurring protein found in high concentrations at wound sites and in platelets. It is not the same as full Thymosin Beta-4, though the two are often conflated. Animal studies suggest TB-500 promotes healing, reduces inflammation, increases flexibility, and supports tissue regeneration across multiple injury models.
Regulatory status
Not FDA-approved for any indication. Not DEA scheduled. TB-500 is a synthetic fragment corresponding to the active region of Thymosin Beta-4, a naturally occurring protein. It is not approved for human use. Compounding pharmacies may compound under physician prescription; regulations vary by state. WADA prohibits Thymosin Beta-4 and its fragments in competitive athletes.
Mechanism of Action
TB-500 appears to work primarily by upregulating actin — a structural protein critical for cell migration and wound healing. By promoting actin polymerization and cell motility, it may accelerate the movement of repair cells to injury sites. It also appears to promote angiogenesis through upregulation of VEGF (vascular endothelial growth factor), reduce inflammation by modulating pro-inflammatory cytokines, and show neuroprotective effects in CNS injury models. The full mechanism in humans is not established.
What Research Has Explored
These are areas of published research — not personal recommendations.
Soft tissue injury healing
Animal studies suggest TB-500 / Tβ4 may accelerate healing of muscle tears, tendon injuries, and ligament damage through enhanced cell migration and angiogenesis.
Context: Popular among athletes for injury recovery. No human RCTs exist for musculoskeletal use.
Cardiac repair
Tβ4 has shown ability to activate cardiac progenitor cells and promote repair after myocardial infarction in animal models. TB-500 (the fragment) shows similar effects in some studies.
Context: This research is in early stages even in animals. Do not interpret as treatment for heart disease.
Wound healing
Tβ4 has entered human clinical trials for wound healing in diabetic foot ulcers (Phase II completed). TB-500 is a fragment and not the same compound, though mechanisms overlap.
Context: Full Tβ4 (not TB-500) has the most advanced human clinical data. The distinction matters when interpreting research applicability.
CNS neuroprotection
Tβ4 appears to promote neural progenitor cell migration and reduce inflammatory damage after CNS injury in animal models.
Context: Very early stage. No human data for neurological applications of TB-500 specifically.
Stability & Delivery Form — Why This Matters
Most peptides are fragile molecules destroyed by stomach acid and digestive enzymes. Delivery form determines whether the peptide survives to reach your bloodstream.
Capsule / Pill Warning
TB-500 in capsule or pill form has no meaningful systemic bioavailability. Stomach acid and digestive enzymes destroy the peptide bonds before absorption. If a product is sold as a capsule claiming the systemic effects of the injectable form, it cannot deliver those effects. This is a red flag about the vendor's credibility.
Subcutaneous or intramuscular injection (lyophilized powder, reconstituted)
The only valid route for systemic effects. TB-500 is a peptide that breaks apart in the GI tract and has no meaningful oral bioavailability. Must be reconstituted from lyophilized (freeze-dried) powder.
Oral capsule
TB-500 in pill form has no meaningful systemic bioavailability. Stomach acid and digestive enzymes destroy the peptide bonds before absorption. Oral TB-500 capsules claiming systemic healing effects cannot deliver those effects.
Reconstitution & Storage
Reconstitute lyophilized powder with bacteriostatic water (benzyl alcohol preserved). Do not use sterile water — once opened, a vial with sterile water must be used immediately as it has no antimicrobial protection. Refrigerate at 2–8°C after reconstitution. Stability is approximately 20–28 days refrigerated. Do not freeze. Protect from light.
Dosing is intentionally not listed here. It is determined by your provider based on individual labs, goals, and clinical context.
Frequently Asked Questions About TB-500
- What is TB-500?
- TB-500 is a synthetic peptide corresponding to the 17-amino-acid active fragment (Ac-SDKPDMAEIEKFDKSKLKKTET-NH2) of Thymosin Beta-4 (Tβ4), a naturally occurring protein found in high concentrations at wound sites and in platelets. It is not the same as full Thymosin Beta-4, though the two are often conflated. Animal studies suggest TB-500 promotes healing, reduces inflammation, increases flexibility, and supports tissue regeneration across multiple injury models.
- What is TB-500 used for in research?
- Full Thymosin Beta-4 (not TB-500 specifically) has reached Phase II human trials for wound healing and corneal applications with promising safety data; TB-500, the synthetic fragment, is studied almost exclusively in animals, and the human data from full Tβ4 cannot be directly extrapolated to the fragment. Research areas include: Soft tissue injury healing, Cardiac repair, Wound healing.
- Is TB-500 FDA approved?
- Not FDA-approved for any indication. Not DEA scheduled. TB-500 is a synthetic fragment corresponding to the active region of Thymosin Beta-4, a naturally occurring protein. It is not approved for human use. Compounding pharmacies may compound under physician prescription; regulations vary by state. WADA prohibits Thymosin Beta-4 and its fragments in competitive athletes.
- How is TB-500 administered?
- Subcutaneous or intramuscular injection only
- What are the safety risks of sourcing TB-500?
- Key risks when sourcing TB-500 from grey-market or research suppliers include: Endotoxin contamination is the primary danger — injecting endotoxins from poorly manufactured vials causes fever, chills, severe local reactions, and in serious cases, systemic infection or sepsis.; TB-500 and full Thymosin Beta-4 are often mislabeled interchangeably on grey market sites. They are related but distinct molecules with different molecular weights and potentially different effects.; Concentration mislabeling is common — many grey market products have been independently tested and found to contain significantly less peptide than labeled, or the wrong peptide entirely.; Grey market vendor 'certificates of analysis' are often performed by unaccredited labs or are fabricated. Third-party COA verification from an accredited mass spectrometry lab is rarely available to consumers..
- Who should avoid or be cautious about TB-500?
- TB-500 should be used with caution or avoided by: History of cancer or active malignancy — angiogenic peptides are theoretically contraindicated due to risk of supporting tumor vascularization.; Competitive athletes — TB-500 / Thymosin Beta-4 is on the WADA Prohibited List (Peptide Hormones, Growth Factors, Related Substances). Use results in disqualification.; Pregnancy and breastfeeding — no safety data.; Autoimmune conditions — modulation of immune/inflammatory pathways may interact unpredictably with autoimmune disease..
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