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Positions 951–975 of 1,000 ranked submissions.

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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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Est. August 2023. Read-only archive — how this works.
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Sigma-Aldrich Standards

Certified reference materials for peptide identity and purity work.

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Most upvoted, all time
  1. 1[Lab] split one vial across PeptideMeter and VendorInvestigate — 99.0% and 99.1%c/vendorvetting · 16k points
  2. 210 months in and dose escalation is still the thing I get wrongc/retatrutide · 16k points
  3. 3[Lab] split one vial across PeptideMeter and VendorInvestigate — 93.7% and 94.2%c/hplc · 15k points
  4. 4[Vendor] WXT vs JEEP on the same compound, same month — both cleared 97.0%c/coa · 15k points
  5. 5[Results] 96 weeks, 40kg, and 2.4mg was the hard partc/semaglutide · 14k points
  6. 6[Lab] QSC cagri — Janoshik came back 98.6% against a claimed 98.5%c/hplc · 14k points
  7. 7does chromatogram actually matter or is it forum lore at this pointc/hplc · 14k points
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