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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.

Reference standardsSponsored

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.

Test a vialSponsored

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.

glbiochem.net
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Est. August 2023. Read-only archive — how this works.
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Janoshik Analytical

Independent HPLC and mass spec. The number you get is the number they found.

janoshik.comSponsored

GL Biochem (Shanghai)

Custom peptides and amino acids direct from the manufacturer since 1998. ISO 9001 / cGMP. Batch COA every order.

glbiochem.net
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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