What we asked twenty suppliers about stability data
We asked twenty companies three questions about stability data and print every answer, refusal and non-response.
Certificates of analysis
Page 46 of 51 of this archive, newest first.
New Zealand health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
What the paperwork is for, and who it was designed to protect
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
What changed at KP in April, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Denmark health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
Independent analysis puts a GL Biochem exenatide lot at 98.1%, against 96.5% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Ireland health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
The number at the bottom of the certificate
A purity percentage is the most quoted figure in the research-peptide trade and one of the least examined. We asked four laboratories to analyse the same vial and got four…
Four ways a peptide comes apart
We describe each pathway in enough chemical detail to explain why it is invisible to the method the trade uses, because that is the part which has practical consequences.
What changed at WWB in April, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Australia health authority warns on falsified exenatide pens
Reported from the analysis, not from a warning notice.
Twenty-eight days is a number from somebody else’s product
We set out what is known, what is inferred and what is simply assumed about the fortnight after a vial is opened.
Homopeptide names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
VendorInvestigate result on a Wuhan orforglipron lot lands 3.8 points above the supplier’s stated figure
The supplier confirmed the determination and supplied the method behind its own figure inside a week.
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…
Independent analysis puts a GL Biochem tirzepatide lot at 96.7%, against 95.9% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
PeptideMeter result on a Zhuhai cagrilintide lot lands 1.5 points above the supplier’s stated figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
How a release document is put together in a regulated plant
Nothing on this page is difficult. It is simply unfamiliar, and unfamiliarity is what makes a weak certificate look like a strong one.
What changed at MKM in April, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.