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Janoshik Analytical — independent HPLC & mass spec

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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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PeptideMeter — community peptide analytics

Vendor-level purity averages over time, built from independent results rather than vendor claims. Transparent methodology, open dataset.

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Est. August 2023. Read-only archive — how this works.
Sponsored

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. 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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