Janoshik result on a Shenzhen liraglutide lot lands 1.2 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Independent testing
Page 19 of 27 of this archive, newest first.
Independent analysis puts a FGP exenatide lot at 96.3%, against 92.6% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
PeptideMeter result on a Guangzhou liraglutide lot lands 3.3 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
How a release document is put together in a regulated plant
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
A part per million, in context
Every instrument specification quoted in an advertisement is a best case obtained on a calibration mixture, not on a submitted vial.
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.
Medutest result on a Suzhou tirzepatide lot lands 2.9 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
What a split-sample exercise can establish, and what it cannot
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.
A tested vial is evidence about a vial
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.
Sending the same vial twice, under two names
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.
Medutest result on a Xi'an semaglutide lot lands 3.3 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Set the threshold at a tenth of a per cent and the small impurities vanish
Baseline placement under a tailing peak is a judgement call with a direct effect on the area. It is one of the few places where two competent analysts genuinely disagree.
Six words a verification badge would need to mean anything
Every step between the laboratory report and the product page removes information, and the badge is the last step.
Repackaging, subdivision, and the batch number that changed hands
The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by the time a vial is opened.
Independent analysis puts a TFC tirzepatide lot at 97.7%, against 95.0% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Independent analysis puts a BCH mazdutide lot at 98.6%, against 96.0% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
Reproducibility, measured rather than assumed
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.
VendorInvestigate result on a Guangzhou liraglutide lot lands 3.6 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
What “LC-MS: conforms” tells a reader, which is almost nothing
What the Journal asks for when it writes to a supplier about an identity claim, and how often it gets it.
How far back does this document actually reach?
The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by the time a vial is opened.