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Sigma-Aldrich — certified reference materials

Reference standards, analytical reagents and system-suitability material. If you are running your own method, start with a known.

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Janoshik Analytical — independent HPLC & mass spec

Send the vial, get the number. Third-party purity and identity testing, results published to you regardless of what they say.

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GL Biochem (Shanghai) Ltd. — the synthesis house

Est. 1998. ISO 9001 and cGMP, 1,500+ staff, 200+ patents. There is a fair chance the vial you are about to send for testing started here. Batch-specific COA as standard.

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