The main Limitless Biotech TB-500 product is synthetic, full-length Thymosin Beta-4, a 43-amino-acid peptide. Here, TB-500 refers to that full-length material. Thymosin Beta-4 Fragment 1-4 and Fragment 17-23 are separate research materials with different sequences and product records.
For research use only. Not for human or animal use.
Full-length Thymosin Beta-4 identity
As a beta-thymosin peptide, full-length Thymosin Beta-4 is studied in relation to actin regulation. Its 43-amino-acid sequence distinguishes it from separately listed fragments, which represent different research materials.
Classic biochemical research found that Thymosin Beta-4 forms a 1:1 complex with monomeric G-actin and sequesters that monomer pool. In those assays, it bound actin monomers rather than filament ends and did not directly elongate actin filaments. This mechanism is more accurate than describing the peptide as simply promoting actin polymerization.
Laboratory research may therefore examine full-length Thymosin Beta-4 in relation to actin availability, cytoskeletal organization, and cell-motility signaling. Those research contexts do not establish a direct result for a person or animal.
The sequence distinction is material to interpretation. Full-length beta-thymosins contain the regions involved in the reported actin interaction, while isolated fragments represent narrower molecular tools. Researchers comparing TB-500 records should verify the exact sequence before interpreting literature, selecting analytical documentation, or grouping full-length and fragment findings together.
Product specifications and documentation
The current TB-500 product record identifies:
- Sequence length: 43 amino acids
- Sequence: Ac-Ser-Asp-Lys-Pro-Asp-Met-Ala-Glu-Ile-Glu-Lys-Phe-Asp-Lys-Ser-Lys-Leu-Lys-Lys-Thr-Glu-Thr-Gln-Glu-Lys-Asn-Pro-Leu-Pro-Ser-Lys-Glu-Thr-Ile-Glu-Gln-Glu-Lys-Gln-Ala-Gly-Glu-Ser
- Molecular formula: C212H350N56O78S
- Molecular weight: 4963.55 g/mol
- CAS number: 77591-33-4
- PubChem CID: 16132341
- Physical appearance: white lyophilized powder
- Storage specification: -20°C, tightly sealed and protected from heat and moisture
- Shelf-life specification: 24 months from manufacture when stored according to the product record
The selected grade controls the minimum purity specification and testing scope. Premium Lyophilized material has a minimum purity specification of at least 99% plus sterility and endotoxin testing. Standard Non-Lyophilized material is independently tested for purity and carries a minimum purity specification of at least 98.5%. Public COAs provide batch-specific results for the applicable grade and lot. Researchers comparing TB-500 for sale within a laboratory-research catalog can review the full-length sequence, selected grade, and applicable public COA before requesting access to professional pricing.
Related Thymosin Beta-4 materials
Separate product records are available for Thymosin Beta-4 Fragment 1-4 and Fragment 17-23. These sequences should be evaluated independently from full-length TB-500.
Researchers can also browse the broader Research Peptides selection for other full-length peptides, fragments, and defined blends.
- Sequence:
- Leu-Lys-Lys-Thr-Glu-Thr-Gln (LKKTETQ)
- Molecular Formula:
- C36H66N10O13
- Molecular Weight:
- 846.97 g/mol
- CAS Number:
- 476014-70-7
- PubChem CID:
- 10169788
- Synonyms:
- Fequesetide, TB-500, Ac-LKKTETQ, Thymosin Beta-4(17-23)
- Purity:
- ≥99% (HPLC)
- Solubility:
- Soluble in water and physiological buffers
- Storage Conditions:
- Store at ≤6°C for short term, -20°C for long term, tightly sealed, away from light and moisture
- Physical Appearance:
- White to off-white lyophilized powder
- Reconstitution:
- Reconstitute in sterile water or bacteriostatic water to desired concentration
- Stability:
- Lyophilized form stable at room temperature for short periods; reconstituted solution should be used promptly or stored at 4°C for short term, -20°C for long term
- Quality Verification:
- Third-party tested by certified laboratory
- Manufacturing Standard:
- USA-made, pharmaceutical-grade, GMP compliant
- Intended Application:
- In vitro research applications only
At Limitless Biotech, we provide comprehensive Certificates of Analysis (COAs) for all of our research-only peptides to ensure transparency, purity, and quality in every batch. Each COA includes detailed analytical data that allows researchers to verify identity, concentration, and integrity, supporting reliable and reproducible scientific work. Our commitment to rigorous testing helps researchers move forward with confidence in the materials they use.
Lyophilized TB-500 Fragment 17-23 5mg #1223 Endotoxin COA
Lyophilized TB-500 Fragment 17-23 5mg #1223 Sterility COA
Lyophilized TB-500 Fragment 17-23 5mg #1223 Purity COA
Lyophilized TB-500 Fragment 17-23 10mg #1298 Purity COA
Lyophilized TB-500 Fragment 17-23 10mg #1298 Sterility COA
Lyophilized TB-500 Fragment 17-23 10mg #1298 Endotoxin COA
Lyophilized TB-500 Fragment 17-23 10mg #1351 Purity COA
