Why Third-Party Testing Matters for Research Peptides Third-party testing has become an industry standard for research peptides. Independent laboratories use HPLC and MS analysis to verify purity, endotoxin levels, and residual solvents. Certificates of Analysis (COA) provide researchers with full traceability for each batch. This ensures that products meet ≥99% purity specifications and are suitable for sensitive research applications. As the peptide research field continues to expand, third-party testing remains a key factor in maintaining quality standards and research reproducibility. Buyers are encouraged to request COA before placing orders.