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            "value": "Third-party testing is the only verification that holds",
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            "q": "How can I detect deletion sequences in a GLP-1 peptide research sample?",
            "a": "HPLC with a validated reference standard is the most reliable method; mass spectrometry alone may miss deletion sequences when the mass difference from a single skipped amino acid is too small to distinguish confidently."
        },
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            "q": "What does a certificate of analysis from an uninspected GLP-1 supplier actually tell me?",
            "a": "Without facility audits and independent batch verification, a CoA from an uninspected supplier is unverified — it may or may not reflect real measurements. Independent HPLC and mass spectrometry on your own sample are the only way to confirm."
        },
        {
            "q": "What contaminants are common in poorly manufactured GLP-1 peptides?",
            "a": "Common issues include deletion sequences (skipped amino acids), D-amino acid enantiomers (mirror-image variants), incomplete fatty acid conjugation, and residual synthesis solvents such as acetonitrile or DMF that persist after lyophilization."
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