What the nitrogen said
Peptide content is the number that tells you how much drug is in the vial. Almost nobody sells it, almost nobody buys it, and when we paid for it on nine vials the results…
Certificates of analysis
Page 38 of 51 of this archive, newest first.
WXT names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Independent analysis puts a TFC mazdutide lot at 98.4%, against 95.9% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Nigeria health authority warns on falsified exenatide pens
Reported from the analysis, not from a warning notice.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Japan health authority warns on falsified tirzepatide pens
Reported from the analysis, not from a warning notice.
HJ names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
The fourteen-day problem, and what it does to a commercial testing model
The absence of microbiological capability in this market is a commercial fact with a straightforward explanation, and it is worth understanding before blaming anybody for it.
Peak capacity, and the honest measure of a separation
Column chemistry, particle size and pore diameter determine what the separation is capable of before the gradient is even programmed.
Independent analysis puts a SGN survodutide lot at 96.5%, against 95.8% on the certificate
The result is unremarkable. What the report states alongside it is not.
PeptideMeter result on a Guangzhou cagrilintide lot lands 3.7 points above the supplier’s stated figure
The result is unremarkable. What the report states alongside it is not.
What changed at HJ in September, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
The question no chromatogram has ever answered
The Journal has read several hundred certificates from twenty companies. We set out what the documents actually cover, and what a reader is filling in from imagination.
The submitted sample: the weakest link in the whole system
A result on one vial generalises to a batch only if the vial was drawn in a way that makes it representative — and nobody records how it was drawn.
What the four services actually offer, test by test
We asked all four services what they can determine, on what timescale, at what price, and under what accreditation. The answers are printed in full.
The United Kingdom health authority warns on falsified dulaglutide pens
Reported from the analysis, not from a warning notice.
A certificate is a snapshot, and peptides do not stand still
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.
What changed at GGPeps in September, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.