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.
Purity
Page 10 of 51 of this archive, newest first.
Adsorption, and the dose that stayed on the glass
At low concentrations a measurable fraction of peptide can adsorb to glass and plastic surfaces, and the loss is largest exactly where it is least expected.
What changed at QSC in January, 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.
Portugal health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
Same mass, different molecule: why identity by mass is not identity
An isoaspartate rearrangement changes the molecule and not the mass. A method that confirms identity by molecular weight alone will report it as the parent compound.
Turnaround, cost and accreditation across the services this trade relies on
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.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
VendorInvestigate result on a Zhuhai retatrutide lot lands 1.8 points above the supplier’s stated figure
A reminder that a purity figure is the output of a method, and that methods differ.
Italy health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
Janoshik, Medutest, PeptideMeter, VendorInvestigate: a capability audit
Four independent services underpin confidence in this market. All four are competent at chemistry. Microbiology is a different accreditation, a different facility and a…
What changed at SGN in January, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Why VendorInvestigate can tell you the mass is right and not that the sequence is
The Journal’s standing position: a mass that matches is necessary evidence of identity and nowhere near sufficient.
The badge economy, and what it is actually certifying
Every step between the laboratory report and the product page removes information, and the badge is the last step.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
What a laboratory knows about the material it receives
Every third-party report in this market describes a sample somebody chose to send. That choice is outside the laboratory’s control and outside its records.
Why TFC can be entirely straightforward and still tell you nothing about bioburden
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.
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 liraglutide pens
Reported from the analysis, not from a warning notice.
The certificate says 2026. The vial in your hand does not say anything.
What happens to traceability when bulk material is subdivided, repackaged and relabelled two or three times before sale.