Janoshik result on a Xi'an tirzepatide lot lands 1.1 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Independent testing
Page 14 of 27 of this archive, newest first.
The cake tells you something, and it is not purity
Dye ingress and microbial immersion are probabilistic. Vacuum decay, high-voltage leak detection and helium mass spectrometry are deterministic and far more sensitive.
Independent analysis puts a CPC tirzepatide lot at 96.6%, against 92.7% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
LAL, kinetic chromogenic, recombinant factor C: three ways to the same figure
We submitted vials for endotoxin determination and report the results, the method and the laboratory, because a pyrogen figure without a method is as empty as a purity…
The header, the table and the signature block
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
Five lines that would change what a certificate is worth
The Journal wrote to twenty companies asking five specific questions about sterility assurance. We report the response rate, the substance and the refusals.
Janoshik result on a Changsha survodutide lot lands 1.0 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
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.
Independent analysis puts a WWB semaglutide lot at 96.9%, against 93.3% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Five lines that would change what a certificate is worth
None of what this piece asks for is commercially sensitive, and all of it is already known to whoever released the batch.
Independent analysis puts a ERP orforglipron lot at 97.4%, against 93.4% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
What VendorInvestigate is able to certify about a sealed vial, and what it is not
Every certificate circulating in this market answers a question about molecules. Almost none answers a question about organisms, pyrogens, or the integrity of the seal.
Independent analysis puts a QYB liraglutide lot at 96.9%, against 96.0% on the certificate
The result is unremarkable. What the report omits is not.
Independent analysis puts a Homopeptide mazdutide lot at 99.2%, against 98.5% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Chain of custody, and where it begins
What a laboratory can and cannot know about the provenance, storage history and representativeness of what lands on its bench.
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.
VendorInvestigate result on a Hangzhou dulaglutide lot lands 2.2 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
What PeptideMeter charges to answer the pyrogen question
The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin the assay cannot see.
Three services, one lot, and a spread of two and a half points
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.
VendorInvestigate result on a Hong Kong retatrutide 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.