Frequently Asked Questions

Thymosin beta-4 is a naturally occurring 43-amino-acid peptide found in nearly all human cells. It regulates actin polymerization (critical for cell migration), promotes wound healing, reduces inflammation, and has shown cardioprotective properties. TB-500 is a commonly used synthetic form.

TB-500 primarily works by regulating actin availability for cell migration — the rate-limiting step in wound repair. It maintains a pool of G-actin ready for rapid polymerization, enabling keratinocytes and fibroblasts to migrate into wound sites. It also promotes angiogenesis and suppresses inflammation via NF-kB inhibition.

LKKTET is the actin-binding domain within thymosin beta-4. This six-amino-acid sequence is responsible for G-actin sequestration and is considered the minimal active sequence for many of TB4's biological effects.

Thymosin beta-4 (Tbeta4) is a 43-amino-acid peptide that is the most abundant member of the beta-thymosin family. Despite its name (a historical artifact from its original isolation from thymus tissue), Tbeta4 is expressed in virtually all nucleated cells and is one of the most abundant intracellular peptides, with concentrations reaching 0.

TB-500 has been investigated across 5 primary research areas: Wound Healing, Tissue Repair, Cardiac Repair, Anti-Inflammatory, Hair Growth. Each area has published preclinical data supporting the peptide's activity through distinct but sometimes overlapping molecular pathways.

Malinda et al. (1999) demonstrated Tbeta4 accelerated dermal wound healing in rats, promoting keratinocyte migration and angiogenesis while reducing inflammation. Additionally, bock-Marquette et al. (2004) showed Tbeta4 promotes survival of cardiomyocytes after ischemic injury through Akt activation, establishing its cardioprotective potential.

Equine research used loading doses of 10 mg every other day for 30 days. Rodent wound healing studies used 5-6 mcg/wound topically or 150 mcg systemically. Cardiac studies in mice used 150 mcg intraperitoneally.

Store lyophilized powder at -20C. Reconstituted solution should be refrigerated at 2-8C and used within 21 days. Tbeta4 is moderately stable in solution.

The CAS registry number for TB-500 is 77591-33-4. The molecular weight is 4921.0 g/mol (full Tbeta4). The amino acid sequence is: Full TB4: Ac-Ser-Asp-Lys-Pro-Asp-Met-Ala-Glu-Ile-Glu-Lys-Phe-Asp-Lys-Ser-Lys-Leu....

Key publications include: Thymosin beta4 accelerates wound healing Among others, there are 4 peer-reviewed publications cited in our research profile, all indexed in PubMed.

Research-grade TB-500 should be at minimum 98% purity as verified by HPLC analysis. Mass spectrometry should confirm molecular identity. Always request a batch-specific Certificate of Analysis (COA) from an independent third-party laboratory before using any peptide in experiments.

Add bacteriostatic water slowly down the inside wall of the vial — never spray directly onto the lyophilized powder. Gently swirl until fully dissolved; the solution should be clear and colorless. Calculate your desired concentration based on the peptide mass and volume of solvent added. Use a sterile syringe and swab the vial stopper with alcohol before each withdrawal.

No. TB-500 is designated Research Use Only (RUO). It is not approved by the FDA for human consumption, veterinary use, or any therapeutic purpose. All references to research findings on this site describe preclinical laboratory studies, not clinical recommendations. Consult a licensed healthcare provider for any medical questions.

TB-500 and TB-500 act through different molecular mechanisms and are studied for overlapping but distinct research applications. Researchers often use both compounds in parallel to compare pathway-specific effects. Detailed mechanism comparisons are available in our research section.

Once reconstituted, TB-500 should be stored at 2-8°C (standard refrigerator temperature) and used within 30 days. Lyophilized (unreconstituted) peptide is stable for 12-24 months at -20°C when kept sealed and protected from light. Never refreeze a reconstituted solution, and avoid repeated freeze-thaw cycles.

Research-grade TB-500 with 98%+ purity, HPLC verification, and third-party COAs is available at researchvials.com. All peptides ship from the USA with cold-chain packaging to maintain product integrity. This site is an educational resource and does not sell products directly.

Research peptides are short chains of amino acids — typically between 2 and 50 residues — synthesized for laboratory investigation. They let researchers study receptor binding kinetics, cellular signaling cascades, and enzyme interactions with high specificity. They are not intended for human use.

It means HPLC analysis confirmed that at least 98% of the lyophilized powder is your target peptide. The remaining fraction is typically truncated sequences or deletion peptides from synthesis. This matters because impurities can activate off-target pathways and wreck dose-response curves. Mass spectrometry provides the second check, confirming molecular identity.

Keep lyophilized (freeze-dried) vials at -20°C. They are remarkably stable in this form — 12 to 24 months with no significant degradation. Once you reconstitute with bacteriostatic water, move to 2-8°C and use within 30 days. The cardinal rules: no repeated freeze-thaw cycles, protect from light, sterile technique every time you draw from the vial.

It means a lab with zero financial ties to the manufacturer independently verifies identity, purity, and endotoxin levels. This eliminates the obvious conflict of interest in self-testing. The resulting Certificate of Analysis (COA) gives you hard data about what is actually in the vial — not what someone claims is in it.

Swab the vial stopper with an alcohol wipe. Draw your bacteriostatic water into a sterile syringe. Inject slowly down the inside glass wall of the vial — not directly onto the cake of powder, which can denature it. Let it sit for a minute, then gently swirl. Never shake. The solution should be perfectly clear. If it is cloudy, something went wrong.

It means the product exists solely for laboratory research — in vitro cell culture work, preclinical animal studies, and educational purposes. RUO compounds have not gone through FDA approval for human safety or efficacy. They cannot legally be sold as drugs, supplements, food additives, or for veterinary use.

Look for four things. First, HPLC purity — should be 98%+ with a clean chromatogram showing one dominant peak. Second, mass spectrometry — the observed molecular weight should match the theoretical weight within instrument precision. Third, appearance — should state white or off-white lyophilized powder. Fourth, endotoxin testing — should be below detection limits for injectable-grade material.

PubMed (pubmed.ncbi.nlm.nih.gov) is the gold standard. Search by peptide name, CAS number, or mechanism. Start with review articles — they synthesize the field so you do not have to read 50 primary papers first. Every PMID we cite on this site links directly to the PubMed entry so you can verify our claims.

This site is purely educational — we do not sell anything. All research peptides referenced here are available at researchvials.com, with 98%+ purity, third-party COAs, and USA-based cold-chain shipping.