Who signed this, and what did they undertake by signing it
Two signatures — one who performed the work, one who approved its release — are the ordinary regulated convention and are almost unknown here.
Independent testing
Page 11 of 27 of this archive, newest first.
PeptideMeter result on a Wuxi mazdutide lot lands 2.1 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Independent analysis puts a QST dulaglutide lot at 95.4%, against 91.5% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
A tested vial is evidence about a vial
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.
PeptideMeter result on a Qingdao cagrilintide lot lands 1.4 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
PeptideMeter result on a Hong Kong mazdutide lot lands 2.6 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Why a dead-clean sterile filter can pass pyrogen straight through
Bacterial endotoxin is a heat-stable lipopolysaccharide from the outer membrane of Gram-negative organisms. It survives sterilisation, passes a sterilising filter, and is…
What a diode array adds, and why the certificate never shows it
A diode-array detector records the whole spectrum at every time point and can confirm that a peak is spectrally homogeneous. Almost nobody prints that information.
Electrospray, MALDI, and the choice that shapes every spectrum after it
The two ionisation techniques in general use produce different charge distributions, different adducts and different failure modes. Certificates almost never say which was…
Independent analysis puts a FGP retatrutide lot at 97.1%, against 95.4% on the certificate
The result is unremarkable. What the report omits is not.
The certificate of analysis, line by line
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
Accuracy, precision and the tolerance nobody states
Parts per million sound impressive until they are converted into daltons at the molecular weight of the thing being measured.
Chain of custody, and where it begins
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.
How a claim degrades between the bench and the listing
Every step between the laboratory report and the product page removes information, and the badge is the last step.
Independent analysis puts a QST orforglipron lot at 98.0%, against 94.2% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
One method is one opinion
Where two methods disagree, the conservative convention is to report the lower figure. It is not universal, and whether a laboratory follows it belongs on the report.
The submitted sample: the weakest link in the whole system
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.
Independent analysis puts a SGN semaglutide lot at 96.6%, against 94.9% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
Independent analysis puts a JEEP retatrutide lot at 96.6%, against 92.9% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Six words a verification badge would need to mean anything
Lot-level verification with a public report is a real and achievable thing. It exists in this market, on a minority of listings.