What is TB-500?
TB-500 is the active synthetic fragment of thymosin beta-4 (Tβ4), a 43-amino acid protein naturally present in virtually all human cells and critical to actin regulation, cell migration, and tissue regeneration. Research shows TB-500 promotes angiogenesis, reduces inflammation, improves tissue flexibility, and accelerates recovery from musculoskeletal injuries. Not FDA-approved; banned from 503A compounding pharmacies.
Mechanism of Action
Sequesters G-actin via thymosin β4 domain; promotes endothelial cell migration and angiogenesis; downregulates inflammatory cytokines (TNF-α, IL-1β); stimulates Wnt/β-catenin pathway
Target: G-actin, Wnt/β-catenin pathway, endothelial cells
Research Indications
Tissue RepairMost Effective
Demonstrated acceleration of wound healing and soft tissue repair in research
Gut HealthEffective
Research shows beneficial effects on intestinal lining and GI function
Joint SupportEffective
Associated with reduced joint inflammation and improved mobility
Muscle RecoveryModerate
May support faster recovery from muscle strains and exercise stress
Research Protocols
These are commonly discussed research protocols — not medical advice. Consult a healthcare provider before use.
Goal Dose Frequency Route Loading Phase (Week 1–4) 5 mg Twice weekly Subcutaneous injection Maintenance Phase (Week 5+) 2.5 mg Once weekly Subcutaneous injection Acute Injury Protocol 5 mg Twice weekly x 4 wks Subcutaneous injection
Peptide & Drug Interactions
Always consult your healthcare provider before combining with other compounds. Use our Interaction Checker for reference.
TB-500 / BPC-157 (stack)Compatible
NSAIDs (Ibuprofen, Naproxen)Caution
CorticosteroidsCaution
AnticoagulantsMonitor
GH SecretagoguesCompatible
NAD+Compatible
How to Reconstitute & Inject
Use bacteriostatic (BAC) water only. Avoid saline — may cause precipitation. Refrigerate and use within 28 days.
1
Remove TB-500 vial from refrigeration and allow to reach room temperature (15–20 minutes) 2
Clean vial top with alcohol swab and allow to air dry completely 3
Using a sterile syringe, draw the calculated volume of bacteriostatic water (BAC water) 4
Inject BAC water slowly down the side of the vial — do not aim directly at the powder 5
Gently swirl in circular motions — DO NOT shake vigorously as this degrades the peptide 6
Allow 2–3 minutes for full dissolution — solution should be clear and colorless 7
Draw calculated dose into an insulin syringe for subcutaneous injection 8
Inject into abdomen, thigh, or upper arm. Rotate injection sites to prevent lipodystrophy 9
Store reconstituted solution refrigerated (2–8°C) and use within 28 days
What to Expect
Week 1–2
Initial anti-inflammatory effects begin. Reduced pain and swelling in target area.
Week 2–4
Improved tissue mobility and reduced discomfort. Early healing acceleration.
Week 4–8
Significant recovery milestones. Stronger tissue repair and functional improvement.
Week 8–12
Near-complete healing in many cases. Improved strength and tissue integrity.
Side Effects & Safety
Generally well-tolerated in research settings Mild nausea with higher doses Injection site redness or discomfort Rare: Dizziness or lightheadedness Potential effect on blood pressure (monitor if hypertensive)
TB-500 is banned from 503A compounding pharmacies. Only available through 503B outsourcing facilities or for research use.
FDA Status & Regulatory Info
Research Only
TB-500 is the active synthetic fragment of thymosin beta-4 (Tβ4), a 43-amino acid protein naturally present in virtually all human cells and critical to actin regulation, cell migration, and tissue regeneration. Research shows TB-500 promotes angiogenesis, reduces inflammation, improves tissue flexibility, and accelerates recovery from musculoskeletal injuries. Not FDA-approved; banned from 503A compounding pharmacies.
Rx Required: No
503A Ban: Yes
Telehealth: N/AFull FDA Status Tracker
Community-reported data
The information below reflects self-reported experiences from PeptIQ app users. It is not clinical evidence and should not replace professional medical advice.
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Research purposes only
This page is for educational reference. It is not medical or legal advice. Consult the FDA and a licensed healthcare professional for current regulations and individualized guidance.