TB-500 Research Peptide
Aug 13th 2026
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.
Frequently asked questions
How does full-length TB-500 differ from Thymosin Beta-4 fragments?
The main TB-500 product is full-length, 43-amino-acid Thymosin Beta-4. Fragment 1-4 and Fragment 17-23 are separately listed research materials with different sequences and should be evaluated independently.
How does Thymosin Beta-4 interact with actin?
Biochemical studies describe a 1:1 complex with monomeric G-actin and sequestration of the monomer pool. The peptide is not accurately described as binding filament ends or directly driving filament elongation.
What documentation is available for TB-500?
Public COAs are available for applicable grades and lots. Review the report that matches the selected material. Professional pricing requires an approved account and login.
View Product Specifications
Review Available Documentation