The badge is about a sample. The listing is about a product.
The Journal does not treat a badge as evidence and states so wherever it reports one.
Certificates of analysis
Page 2 of 51 of this archive, newest first.
Independent analysis puts a QYB semaglutide lot at 98.3%, against 96.3% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
The instrument was calibrated on Tuesday. Your sample ran on Friday.
Calibration drift is real, unremarkable, and the reason serious laboratories run internal standards.
Why a 0.036-dalton difference is the hardest number in peptide identity
Every instrument specification quoted in an advertisement is a best case obtained on a calibration mixture, not on a submitted vial.
Isobaric substitutions: identical masses, different molecules
Deamidation adds 0.98 daltons. On a low-resolution instrument at incretin molecular weights, that is inside the noise.
VendorInvestigate result on a Chengdu retatrutide lot lands 3.0 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
Why the independent testing market grew a chemistry arm and not a microbiology one
Four independent services underpin confidence in this market. All four are competent at chemistry. Microbiology is a different accreditation, a different facility and a…
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
What twenty companies say about storage, and what they have measured
A stability programme needs a protocol, defined conditions, a stability-indicating method and time. Time is the ingredient no commercial testing service can sell.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
From vial to bench: what is recorded and what is assumed
The condition on arrival is recorded by some services and not others, and it is one of the more informative lines in a report.
Argentina health authority warns on falsified exenatide pens
Reported from the analysis, not from a warning notice.
VendorInvestigate result on a Guangzhou retatrutide lot lands 4.2 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
What changed at WXT in May, and what the company will not say about it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Sterility is not a percentage, which is the whole difficulty
Purity, content, identity, sterility and endotoxin are five separate determinations. A single sheet of paper carrying one of them is not evidence about the other four.
The word “confirmed” is doing an enormous amount of work on this certificate
The Journal’s standing position: a mass that matches is necessary evidence of identity and nowhere near sufficient.
The specification sheet says 500,000. The report says conforms.
Every instrument specification quoted in an advertisement is a best case obtained on a calibration mixture, not on a submitted vial.
Portugal health authority warns on falsified exenatide pens
Reported from the analysis, not from a warning notice.
PeptideMeter result on a Wuxi dulaglutide lot lands 2.2 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.