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Sourcing quality checklist: Certificate of Analysis (COA) with lot-specific data HPLC purity percentage stated (look for ≥98% for research-grade material) Third-party identity and potency testing (mass spectrometry confirmation) Clear labeling of peptide sequence and molecular weight Vendor transparency about manufacturing origin and testing laboratory Red flags: vague or undated COAs, missing lot numbers, prices substantially below market norms, and shipping from unregulated international sources
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Step 6: Review the Results Check the estimated concentration, mL per dose, syringe measurement, and doses per vial