What is TB500 Thymosin Beta 4 and how does its actin-binding mechanism work?

TB500 (Thymosin Beta 4, Tβ4) is a highly conserved 43-amino acid polypeptide that functions as the primary intracellular G-actin sequestering protein in mammalian cells. Tβ4's mechanism centers on actin dynamics regulation: the peptide binds monomeric G-actin (globular actin) with 1:1 stoichiometry via its central actin-binding domain (residues 17-28), preventing G-actin polymerization into F-actin (filamentous actin) and creating a reserve pool of polymerization-competent monomers. Beyond actin sequestration, TB500 promotes: (1) Cell migration - by modulating actin cytoskeleton dynamics, facilitating lamellipodia formation and cellular motility critical for wound healing, (2) Angiogenesis - stimulating endothelial cell migration and blood vessel formation through VEGF-independent pathways, upregulating genes like Notch and Angiopoietin-2, (3) Anti-inflammation - reducing inflammatory cytokines (TNF-α, IL-1β, IL-6) and NF-κB activation, (4) Extracellular signaling - once secreted, TB500 binds integrin receptors and activates PI3K-Akt and MAPK signaling pathways promoting cell survival and proliferation, and (5) Matrix metalloproteinase modulation - regulating MMP expression affecting ECM remodeling. This multifaceted mechanism makes TB500 invaluable for studying wound healing, tissue repair, regenerative medicine, cardiovascular research, and cellular migration dynamics in laboratory models.

What research applications benefit from TB500's unique wound healing and regeneration properties?

TB500 excels in wound healing research investigating accelerated tissue repair, dermal regeneration, and epithelial closure mechanisms, angiogenesis studies examining VEGF-independent blood vessel formation, endothelial cell migration, and vascular remodeling, cardiovascular research including post-infarction cardiac repair, cardiomyocyte survival, and ventricular remodeling studies, skeletal muscle regeneration investigating satellite cell activation, myoblast differentiation, and muscle fiber repair after injury, tendon and ligament healing research examining collagen deposition, tenocyte proliferation, and ECM remodeling, corneal wound healing and ocular surface repair studies, neurological research investigating neuroprotection, neural regeneration, and blood-brain barrier modulation, anti-inflammatory pathway studies examining cytokine suppression and NF-κB inhibition, stem cell migration and homing research, extracellular matrix remodeling and MMP regulation studies, and comparative regenerative peptide research (TB500 vs BPC-157, GHK-Cu). The peptide's dual intracellular (actin-binding) and extracellular (integrin-mediated signaling) functions make it uniquely valuable for investigating complex tissue repair cascades. Ideal for regenerative medicine labs, cardiovascular research, wound healing studies, and cell migration/cytoskeleton dynamics research.

What purity and quality standards does your TB500 Thymosin Beta 4 meet?

Our TB500 exceeds >98% purity verified by HPLC analysis with comprehensive quality control for the 43-amino acid peptide. Each batch undergoes: mass spectrometry molecular weight confirmation for the complete Thymosin Beta 4 sequence (molecular weight ~4963 Da), peptide sequence verification confirming all 43 amino acids including the critical actin-binding domain (residues 17-28), HPLC demonstrating single major peak with proper retention time and minimal degradation products, actin-binding assays measuring TB500's ability to sequester G-actin and prevent polymerization (quantified via pyrene-actin polymerization assays showing dose-dependent inhibition), cell migration bioassays using scratch/wound healing assays in fibroblast or endothelial cell monolayers demonstrating enhanced migration rates, proliferation assays showing increased cell proliferation in appropriate cell types, endotoxin screening ( 98% purity ensures reproducible actin-binding activity, consistent cell migration effects, and reliable angiogenic properties without interference from degradation products or incorrect sequences. All testing validates both chemical identity (correct 43-AA sequence, proper molecular weight) and biological activity (actin sequestration, cell migration stimulation) essential for reliable wound healing and regenerative research.

How does TB500 compare to BPC-157 for tissue repair and healing research?

TB500 and BPC-157 are both valuable tissue repair peptides but have distinct mechanisms and applications: (1) Mechanism - TB500 is actin-sequestering peptide modulating cytoskeleton dynamics and integrin signaling, BPC-157 is gastric pentadecapeptide (15 AA) promoting angiogenesis via VEGF receptor-2 and nitric oxide pathways, (2) Size - TB500 is 43 amino acids (~4963 Da), BPC-157 is 15 amino acids (~1419 Da) making it more stable, (3) Angiogenesis - both promote blood vessel formation but via different pathways (TB500: VEGF-independent Notch/Ang-2, BPC-157: VEGF-R2 dependent), (4) Wound healing - TB500 emphasizes cell migration via actin dynamics and lamellipodia formation, BPC-157 focuses on fibroblast activation and collagen synthesis, (5) Anti-inflammation - both reduce inflammatory cytokines but TB500 acts via NF-κB inhibition, BPC-157 via multiple growth factor pathways, (6) Stability - BPC-157's smaller size and D-amino acid substitutions may provide enhanced gastric stability, TB500 requires careful handling, and (7) Applications - choose TB500 for actin cytoskeleton studies, cell migration research, and cardiovascular repair; choose BPC-157 for gastrointestinal healing, tendon-to-bone healing, and VEGF pathway research. Both can be used in combination for synergistic tissue repair research investigating complementary mechanisms.

How should TB500 Thymosin Beta 4 be stored and reconstituted?

Store lyophilized TB500 at -20°C in original sealed vials for 24+ months stability. The 43-amino acid peptide maintains structural integrity when lyophilized and frozen. Reconstitute by adding bacteriostatic water (0.9% benzyl alcohol) or sterile saline slowly down the vial wall, then gently swirl (never shake to avoid disrupting the actin-binding domain structure) until completely dissolved at typical concentration 1-5 mg/mL. Refrigerate reconstituted solution at 2-8°C and use within 14 days to maintain optimal actin-sequestering bioactivity. TB500's actin-binding function requires proper folding of the central binding domain (residues 17-28), making gentle handling critical. Avoid multiple freeze-thaw cycles which can cause protein misfolding and aggregation, compromising actin-binding affinity. For cell culture studies requiring multiple applications, aliquot reconstituted solution into single-use sterile tubes immediately after reconstitution to prevent repeated temperature cycling and bacterial contamination. Store aliquots at 2-8°C or -20°C for longer-term storage (with understanding that one freeze-thaw has occurred). Proper storage ensures consistent G-actin sequestration activity, reproducible cell migration effects, and reliable wound healing research outcomes. The peptide's biological activity in cell migration and tissue repair assays serves as functional validation of proper handling.

What makes TB500's dual intracellular and extracellular functions unique?

TB500 exhibits remarkable functional duality operating in both intracellular and extracellular compartments with distinct mechanisms: Intracellularly, TB500 is the principal G-actin sequestering protein, binding monomeric actin with high affinity (Kd ~0.5 μM) and preventing spontaneous polymerization while maintaining a reserve of polymerization-competent actin monomers. This actin-sequestering function regulates cytoskeleton dynamics, cell shape, motility, and division. Upon secretion (or when administered extracellularly in research), TB500 functions as a signaling molecule binding integrin receptors (particularly α5β1 and αvβ3) and activating downstream PI3K-Akt pro-survival pathways, ERK1/2 MAPK proliferation signaling, and focal adhesion kinase (FAK) affecting cell adhesion and migration. This dual functionality means: (1) Intracellular TB500 controls actin polymerization dynamics essential for lamellipodia formation during migration, (2) Extracellular TB500 signals through integrin receptors promoting cell survival, proliferation, and directional migration, and (3) Both functions synergize to enhance wound healing - actin dynamics enable cellular motility while integrin signaling provides survival cues and directional guidance. This intracellular-extracellular interplay makes TB500 uniquely powerful for tissue repair research compared to purely extracellular growth factors or purely structural cytoskeletal proteins. Researchers can investigate both actin cytoskeleton biology and integrin-mediated signaling using the same peptide.

What dosage variants and bulk pricing are available for TB500?

We offer 3 specification options: BT2 (2mg per 10-vial kit), BT5 (5mg per 10-vial kit), and BT10 (10mg per 10-vial kit). Pricing structure: BT2 at $90/kit (1 kit), $85/kit (20+ kits receiving ~6% discount), $80/kit (50+ kits receiving ~11% discount). BT5 at $120/kit (1 kit), $115/kit (20+ kits), $115/kit (50+ kits). BT10 at $230/kit (1 kit), $225/kit (20+ kits receiving ~2% discount), $220/kit (50+ kits receiving ~4% discount). The concentration range supports diverse research from pilot wound healing studies and cell migration assays (2mg for initial dose-response characterization, scratch assays, actin-binding validation) to extensive multi-week tissue repair protocols and large animal models (10mg for chronic wound healing studies, cardiovascular repair research, comprehensive regenerative medicine investigations). Bulk pricing reflects complex 43-amino acid synthesis requiring careful actin-binding domain construction while maintaining >98% pharmaceutical-grade purity and actin-sequestering bioactivity. For large-scale regenerative medicine research, multi-year wound healing programs, cardiovascular repair studies, institutional core facility procurement, or pharmaceutical development investigating tissue repair peptides, contact via WhatsApp to discuss custom quantity requirements and volume pricing. The standardized pharmaceutical-grade formulation ensures reproducible actin-binding activity, consistent cell migration effects, and reliable tissue repair research for academic regenerative medicine labs, cardiovascular research institutes, and wound healing investigation centers worldwide.

How do you validate TB500's actin-binding and wound healing bioactivity?

Beyond chemical purity (HPLC, mass spec confirming correct 43-AA sequence), we perform comprehensive functional bioassays: (1) Pyrene-actin polymerization assays - measuring TB500's ability to prevent G-actin polymerization by monitoring fluorescence decrease (pyrene-labeled actin fluorescence increases upon polymerization into F-actin; TB500 sequestering G-actin prevents this increase), demonstrating dose-dependent inhibition with IC50 values confirming actin-binding affinity, (2) Scratch/wound healing assays - creating standardized scratches in confluent fibroblast (NIH-3T3) or endothelial (HUVEC) monolayers, treating with TB500, and measuring gap closure over 24-48 hours via microscopy showing accelerated migration into the wound area vs controls, (3) Transwell migration assays - measuring TB500-induced chemotactic migration through porous membranes toward chemoattractant gradients, (4) Cell proliferation assays - MTT or BrdU incorporation demonstrating increased proliferation in TB500-treated cells, (5) Actin cytoskeleton imaging - phalloidin staining revealing TB500's effects on lamellipodia formation, stress fiber organization, and cellular morphology, (6) Tube formation assays - endothelial cells on Matrigel showing TB500-promoted angiogenic tube/network formation indicating angiogenic bioactivity, and (7) Signaling pathway activation - Western blots demonstrating TB500-induced phosphorylation of Akt, ERK1/2, and FAK confirming integrin-mediated signaling. CoA includes actin-binding data (pyrene-actin IC50 values) and cell migration bioactivity (fold-increase in wound closure vs control) ensuring physiologically relevant tissue repair activity.

Can TB500 be combined with BPC-157 or growth factors for synergistic tissue repair research?

Absolutely! TB500 combinations provide valuable insights into multi-pathway tissue repair mechanisms: (1) TB500 + BPC-157 - combining actin-cytoskeleton modulation (TB500) with VEGF-R2 angiogenic signaling (BPC-157) produces synergistic wound healing in many models, investigating complementary repair pathways, (2) TB500 + IGF-1/MGF - integrating actin dynamics (TB500) with growth factor receptor signaling (IGF-1) for muscle regeneration research examining satellite cell activation and myoblast fusion, (3) TB500 + VEGF - comparing TB500's VEGF-independent angiogenesis vs direct VEGF pathway stimulation, (4) TB500 + FGF-2 - investigating combined effects on fibroblast proliferation and ECM remodeling, and (5) TB500 + GHK-Cu - dual peptide tissue repair combining actin-mediated migration (TB500) with copper-dependent matrix remodeling (GHK-Cu). These combinations reveal: whether actin cytoskeleton dynamics are rate-limiting in growth factor-stimulated repair, how integrin signaling (TB500 extracellular function) interacts with growth factor receptor pathways, and whether combining migration-promoting (TB500) and proliferation-promoting (growth factors) mechanisms produces additive or synergistic healing. Research applications include optimizing tissue engineering scaffold designs, developing multi-factor wound healing protocols, understanding redundant vs complementary repair pathways, and pharmaceutical development of combination regenerative therapies. The modular nature allows systematic investigation of individual vs combined pathway contributions to complex tissue repair cascades.

What documentation and shipping support TB500 Thymosin Beta 4 research?

We ship TB500 in lyophilized form with cold pack insulation in sealed, insulated packaging. The 43-amino acid peptide tolerates ambient temperature for short periods (up to 7 days) but cold packs minimize degradation risk of the actin-binding domain during international transit. International delivery typically takes 10-14 days with tracking. Each batch includes comprehensive Certificate of Analysis: HPLC chromatogram demonstrating >98% purity with retention time and peak integration, mass spectrometry data confirming molecular weight for the complete 43-amino acid Thymosin Beta 4 sequence (~4963 Da), peptide sequence verification confirming all residues including the critical actin-binding domain (residues 17-28 containing the LKKTET motif), pyrene-actin polymerization assay results demonstrating G-actin sequestering bioactivity with IC50 values (typically in low micromolar range), scratch/wound healing assay data showing fold-increase in cell migration vs control (demonstrating tissue repair bioactivity), cell proliferation data from appropriate cell lines, endotoxin testing results (<0.1 EU/mg), batch number and manufacturing date for traceability, storage recommendations (lyophilized: -20°C long-term; reconstituted: 2-8°C for 14 days), and suggested reconstitution protocols for cell culture and tissue repair research. This comprehensive documentation satisfies institutional biosafety committees and research compliance requirements for regenerative medicine peptide procurement. Transfer lyophilized vials to -20°C storage immediately upon receipt for long-term stability supporting multi-week wound healing protocols, cardiovascular repair studies, and tissue regeneration research investigating actin-cytoskeleton-mediated cellular migration and angiogenic mechanisms.

Home ProductsTB-500 (Thymosin Beta 4)

Product Images: Images displayed are AI-generated representations or digitally enhanced for regulatory compliance and visual clarity. Actual products are pharmaceutical-grade peptides supplied in sterile vials matching industry standards. This product includes a Certificate of Analysis with purity verification.

TB2

TB-500 (Thymosin Beta 4)

For research and laboratory use only. Not for human consumption.

Premium pharmaceutical-grade TB500 Thymosin Beta 4 for advanced research applications

Pick Your Size

Select Quantity

Researcher·1 Kit

Volume pricing

Per-kit price drops as you scale

Add 1 more kit

Unlock Lab pricing at $190/kit

+$190

extra savings

Total Price

$285

Free Worldwide Shipping

No minimum order. Customs handled.

Express Delivery

7-14 Days

Ships To

190+ Countries

Customs Handled

99% Success Rate

Stealth Packaging

Cold-Chain

Lab-Grade Guarantee

If an independent HPLC assay of your lot comes back below the purity stated on our published Certificate of Analysis, we reship your order free. Verifiable, not a promise.

99.41% Purity Verified

HPLC / ESI-MS Tested

View Report

FOR RESEARCH PURPOSES ONLY. This product is strictly for laboratory and research use. Not for human consumption, medical treatment, or any clinical application. By ordering, you confirm you are a qualified researcher or represent a legitimate research institution.

TB-500 (Thymosin Beta 4): Key Facts

TB-500 (Thymosin Beta 4) is a healing recovery research peptide supplied by LyzeLabs as a lyophilized reference standard, strictly for laboratory research use. It is available in 3 formats starting at $285 per kit. Each batch is independently HPLC-verified at 99.41% purity by Janoshik Analytical, with the certificate of analysis published on the lab-results page and matched to the lot number printed on the vial.

Third-party verified batch

Compound	TB-500 (Thymosin Beta 4)
Research category	Healing Recovery
Available formats	2mg10vials, 5mg10vials, 10mg*10vials
Starting price	From $285 USD per kit
Purity	99.41% verified (third-party HPLC, Janoshik)
Test method	HPLC / ESI-MS
Certificate of analysis	Published online, matched to the vial lot number
Intended use	Laboratory research use only. Not for human consumption.
Handling	Supplied lyophilized, store per the stability guide

What Researchers Say

Dr. Kavita Menon

Switzerland

"Our regenerative medicine lab at a clinical research team in Chandigarh has been using LyzeLabs TB500 Thymosin Beta 4 for wound healing and tissue repair research for 8 months. The actin-binding bioactivity is exceptional - our pyrene-actin polymerization assays show dose-dependent G-actin sequestration with IC50 of 2.3 μM, matching published values for native Tβ4 and confirming intact actin-binding domain function. We independently verified >98.2% purity via HPLC with single major peak and mass spec confirmed molecular weight 4964.1 Da for the complete 43-amino acid sequence. Our primary research investigates TB500's dual intracellular (actin cytoskeleton regulation) and extracellular (integrin signaling) functions in wound healing. Scratch assays on NIH-3T3 fibroblasts demonstrate 2.8x faster wound closure (measured at 24h) compared to controls, with phalloidin staining revealing enhanced lamellipodia formation at wound edges - the hallmark of TB500-stimulated actin dynamics promoting cellular migration. We confirmed extracellular signaling via Western blots showing TB500-induced phosphorylation of Akt (Ser473), ERK1/2, and FAK demonstrating integrin-mediated pathway activation. Transwell migration assays show 3.4x increased chemotactic migration. HUVEC tube formation assays on Matrigel demonstrate angiogenic bioactivity with increased network branch points. The BT2, BT5, and BT10 variants (2mg, 5mg, 10mg) support our dose-response studies and multi-week dermal wound healing protocols. We compared TB500 vs BPC-157 - both accelerate healing but via distinct mechanisms (actin-cytoskeleton vs VEGF pathways), making combination approaches valuable. Delivery to Punjab takes 11-13 days with proper cold-chain packaging. Outstanding tissue repair peptide for international regenerative research."

2025-11-15

Mia C.

United States

"Ran it against a known standard and it tracked. No surprises."

2025-11-12

Lena K.

Sweden

"Bulk order went through without a hitch. Each lot had its own COA."

2025-11-09

About This Product

TB-500 (Thymosin Beta 4) Research Guide

The Actin Sequestration Peptide

TB-500 is a synthetic version of the active region of Thymosin Beta 4, specifically the amino acid fragment that drives the compound's primary biological activity. Thymosin Beta 4 is a 43 amino acid protein originally isolated from thymus tissue. The research-grade TB-500 supplied here is the active 7 amino acid core sequence (LKKTETQ) with a molecular weight of approximately 889.0 Da.

The Mechanism Is Specific and Well-Characterized

Unlike BPC-157 which acts on overlapping systems, TB-500 has one primary, tightly-defined mechanism: actin sequestration. The peptide binds free G-actin monomers in the cytoplasm and regulates the dynamics of actin polymerization into filaments. Actin polymerization is the process that drives cell migration across tissue gradients.

By modulating this process, TB-500 supports the migration of fibroblasts, endothelial cells, keratinocytes, and stem-like progenitor cells toward a site of injury, which is a critical step in the tissue repair cascade.

Research Applications

Muscle injury recovery and myocellular migration research
Dermal wound healing and keratinocyte migration models
Vascular remodeling and endothelial cell migration studies
Connective tissue remodeling in long-duration repair protocols
Complementary use with BPC-157 for research models that require both angiogenesis (BPC-157) and cell migration (TB-500) signals, via the [BPC + TB blend](/product/bpc-tb-blend)
Extended blend work with GHK-Cu and KPV via the [GLOW](/product/glow-healing-blend) and [KLOW](/product/klow) combinations

Quality Standards

Purity: 99 percent plus verified by independent third-party HPLC (Janoshik Analytical)
Mass Spec Confirmation: within tolerance of the expected molecular weight for the active 7 amino acid fragment
Form: lyophilized powder in sterile vials
Storage: refrigerator for near-term use, minus 20 degrees Celsius long-term
Documentation: batch-matched Certificate of Analysis published at /lab-results

For the mechanism-level comparison with BPC-157 and the reasoning behind the blend formats, see [BPC-157 vs TB-500](/blog/bpc-157-vs-tb-500-healing-blend-guide).

For research purposes only. Not for human consumption or therapeutic use.

Research Context for TB-500 (Thymosin Beta 4)

Tissue Repair and Recovery Research Context

Healing and recovery peptides are studied across tendon, muscle, nerve, vascular, and gastrointestinal models. Research in this category focuses on angiogenesis, cell migration, growth factor signaling, and the kinetics of repair under controlled conditions. Reproducibility depends heavily on batch consistency and reliable analytical verification.

TB-500 (Thymosin Beta 4) ships as a lyophilized research reagent through the LyzeLabs™ catalog in the Healing Recovery category, with 3 variant options sized to different research protocols. Every batch is independently verified by Janoshik Analytical, with the full HPLC chromatogram and mass spectrometry confirmation published on the LyzeLabs lab results page and matched to the lot number printed on your vial.

Related Research Guides

BPC-157 Research Guide

Mechanism, tendon and gut research applications, and sourcing for the most reached-for recovery peptide in the catalog.

BPC-157 vs TB-500 and the Blend Format

Why recovery labs use both peptides together and when a premixed blend is the right call.

How to Read a Peptide Certificate of Analysis

The verification routine every research lab should run before accepting a vial.

Other Compounds in the Healing Recovery Category

BPC-157

Dermorphin

KPV

Research Tools for This Compound

Frequently Asked Questions

TB-500 (Thymosin Beta 4)

$285