What TB-500 is

TB-500 is a research-grade synthetic peptide supplied by PX1 for laboratory use only. This guide summarizes what the peer-reviewed literature describes about its structure, mechanism, and handling, and how to evaluate purity documentation before you commit to a lot.

Structure and pharmacology

The peptide is characterized by a defined amino acid sequence and molecular weight that must match the reference mass on the Certificate of Analysis to within instrument tolerance. Small deviations — a missing residue, a truncation, an oxidized methionine — change the mass and are visible on mass spectrometry. Any reputable manufacturing lab supplies LC-MS or MALDI-TOF confirmation with every lot.

Mechanistically, the literature on TB-500 centers on defined receptor interactions and downstream signaling cascades. Researchers evaluating TB-500 typically look for:

• Receptor binding affinity data (Kd or IC50) versus a reference standard
• Documented half-life in the target model system
• Metabolic pathway (proteolytic clearance, receptor internalization, or renal filtration)
• Known off-target interactions at physiologically relevant concentrations

Published research

The published record on TB-500 spans in-vitro receptor pharmacology, rodent efficacy models, and — for the more clinically advanced peptides in this class — human trial data. PX1 does not summarize efficacy in terms that could be interpreted as medical guidance. What matters for a lab buyer is that the reference literature exists, is indexed on PubMed, and describes reproducible endpoints in models comparable to the one you plan to run.

Handling in the lab

TB-500 is supplied lyophilized in sealed borosilicate vials. Once received:

1. Store the sealed vial refrigerated (2–8 °C) or frozen if the certificate specifies. Room-temperature transit is acceptable for short shipping windows.
2. Reconstitute with bacteriostatic water or sterile saline per your protocol; swirl gently rather than shaking to avoid foaming and denaturation.
3. Store the reconstituted solution refrigerated and use within 30 days, or aliquot and freeze at −20 °C for longer storage.
4. Log the reconstitution date on the vial and the lot number in your notebook — traceability is the difference between a publishable result and an untrusted one.

Purity and identity documentation

Every PX1 lot of TB-500 ships with a lot-specific Certificate of Analysis. That COA contains:

• HPLC purity (target ≥99%) with the actual chromatogram
• Mass spectrometry identity confirmation with observed vs. theoretical mass
• Endotoxin (LAL) results appropriate to the intended use
• Residual solvent screen (acetonitrile, TFA, DMF where applicable)
• Water content by Karl Fischer titration

Current lot documentation is available at /purity-reports. If a supplier cannot produce lot-specific paperwork, walk away — a "representative" COA from an unrelated batch does not certify what is in your vial.

Sourcing considerations for TB-500

TB-500 is not FDA-approved for the indications discussed in the research literature and must be labeled for research use only. When evaluating any source for TB-500:

• Confirm the peptide is manufactured to a validated SOP under documented QC
• Confirm the label matches the COA lot number exactly
• Confirm the vial appearance matches the expected lyophilized cake description
• Confirm the fill volume matches the label claim (a common shortcut on low-quality product)

PX1 supplies TB-500 with the same documentation regimen we apply to every peptide in our catalog. Every lot is traceable end to end, and every purchase includes the corresponding COA.

Research use only. Not for human consumption. Not intended to diagnose, treat, cure, or prevent any disease.