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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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Sigma-Aldrich Standards

Certified reference materials for peptide identity and purity work.

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  1. 1tried semaglutide for 15 weeks. here is what happened.c/semaglutide · 18k points
  2. 2the units question that gets asked weekly, answered properlyc/reconstitution · 17k points
  3. 3[Vendor] WXT order #5 — the Netherlands, 35 days, no drama, receipts insidec/coa · 15k points
  4. 4GIP: the version I wish someone had shown me in week 1c/tirzepatide · 15k points
  5. 511 months in and testing is still the thing I get wrongc/vendorvetting · 14k points
  6. 6[Results] 2 weeks, 46kg, and phase 2 was the hard partc/retatrutide · 14k points
  7. 7[Lab] SGN cagri — VendorInvestigate came back 93.7% against a claimed 94.2%c/hplc · 14k points
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