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Quality signals to look for: Lot-specific COA with HPLC chromatogram and purity percentage (≥98% is a common research-grade benchmark) Mass spectrometry (MS) confirmation of peptide identity alongside HPLC Named third-party testing laboratory on the COA Clear molecular weight and amino acid sequence listed Vendor willingness to provide documentation on request Red flags: COA with no lot number or no date Purity stated without a testing method Prices more than 40–50% below typical market ranges No verifiable third-party testing laboratory Vague product descriptions that omit sequence or molecular weight Vendor technical pages provide useful formulation details (ratios, lyophilized format, COA availability) but should not substitute for peer-reviewed evidence about efficacy or safety