Source comparison
Best TB-500 Supplier Third Party Tested 2026: Quality Comparison
Purity Documentation Batch-specific HPLC from ISO 17025 lab, includes chromatogram Supplier-generated report, no external validation Third-party verification eliminates conflict of interest. Only method that catches post-synthesis degradation Molecular Weight
This comparison does not assign a generated winner or score.
- Purity Documentation
- Batch-specific HPLC from ISO 17025 lab, includes chromatogram
- Supplier-generated report, no external validation
- Third-party verification eliminates conflict of interest. Only method that catches post-synthesis degradation
- Molecular Weight Confirmation
- Mass spectrometry showing 4963.4 Da ±0.5 Da
- Theoretical value cited without measurement
- Mass spec catches amino acid substitutions HPLC cannot detect
- Endotoxin Testing
- LAL assay ≤1 EU/mg from external lab
- No endotoxin data or self-tested
- Endotoxins confound cell culture and in vivo research. Non-negotiable for biological work
- Testing Timing
- Post-shipping sample analysis available
- Pre-shipment testing only
- Peptides degrade during transit. Destination testing confirms arrival quality
- Certificate Accessibility
- Batch number linked to downloadable COA with lab contact
- Generic quality claims without batch traceability
- Verifiable certificates allow researchers to audit testing lab credentials
- Storage Protocol Verification
- Temperature logging during shipment, cold packs used
- No temperature monitoring
- TB-500 degrades above 8°C. Unmonitored shipping creates unquantified risk