We split six vials four ways and posted them
Two years ago we ran an anonymised version of this comparison and promised a named one. This is it, with every method printed in full.
Vendors
Page 18 of 48 of this archive, newest first.
FGP names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What a 17% rise in coupling-reagent prices does to a 5 mg vial
Follow the resin, not the catalogue.
VendorInvestigate result on a Shenzhen dulaglutide lot lands 2.0 points above the supplier’s stated figure
A reminder that a purity figure is the output of a method, and that methods differ.
The badge economy, and what it is actually certifying
Lot-level verification with a public report is a real and achievable thing. It exists in this market, on a minority of listings.
Independent analysis puts a SWB tirzepatide lot at 95.6%, against 93.1% on the certificate
The result is unremarkable. What the report states alongside it is not.
Shanghai export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
A supplier suspends shipping to South Korea after 10 consecutive customs detentions
The route did not close because of a rule about peptides.
Who signed this, and what did they undertake by signing it
A manufacturer’s certificate is a self-declaration. An accredited laboratory’s report is a third-party measurement. The trade prints both under one heading.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
What a batch number is supposed to mean
A document is only as good as the chain that connects it to the material, and most chains here are two or three links longer than the paperwork admits.
A document, not a test: what a certificate actually is
Nothing on this page is difficult. It is simply unfamiliar, and unfamiliarity is what makes a weak certificate look like a strong one.
What a 35% rise in coupling-reagent prices does to a 30 mg vial
Follow the resin, not the catalogue.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
What a split-sample exercise can establish, and what it cannot
The Journal submitted split samples from single lots to three assay services, under names unconnected to this publication, and published each method alongside each result.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
ERP names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
A supplier suspends shipping to the Netherlands after 19 consecutive customs detentions
The route did not close because of a rule about peptides.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.