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.
Analytics in 2025
Page 5 of 11 of this archive, newest first.
A named analyst is the cheapest quality signal in this trade
Two signatures — one who performed the work, one who approved its release — are the ordinary regulated convention and are almost unknown here.
VendorInvestigate result on a Wuhan mazdutide lot lands 3.4 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Independent analysis puts a QSC liraglutide lot at 99.2%, against 97.6% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
What twenty companies say about storage, and what they have measured
Storage instructions in this market are close to uniform and almost never accompanied by the study that would justify them. Uniformity is a sign of convention, not of…
Independent analysis puts a GL Biochem liraglutide lot at 96.0%, against 93.9% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
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.
Medutest result on a Qingdao orforglipron lot lands 0.8 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
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.
The badge is about a sample. The listing is about a product.
A badge asserts that something was tested. It does not assert what, when, on whose sample, by what method, or whether the lot on sale is the lot that was tested.
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.
Six words a verification badge would need to mean anything
What a verification mark would have to carry to be checkable: a date, a lot, a method, a submitter and a link to the report.
Independent analysis puts a JEEP orforglipron lot at 95.5%, against 92.7% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
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.
Independent analysis puts a HJ dulaglutide lot at 98.7%, against 96.2% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
The certificate of analysis, line by line
The purity figure is the least informative line on a well-constructed certificate and the only line most buyers read.
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.
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.
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.