New Zealand health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
Purity
Page 46 of 51 of this archive, newest first.
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.
VendorInvestigate result on a Qingdao retatrutide lot lands 3.6 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
A document, not a test: what a certificate actually is
Nothing on this page is difficult. It is simply unfamiliar, and unfamiliarity is what makes a weak certificate look like a strong one.
Denmark health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
QYB declines, for the 10th time, to name its synthesis house
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Ireland health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
Freezing a reconstituted vial: the ice-water interface problem
At low concentrations a measurable fraction of peptide can adsorb to glass and plastic surfaces, and the loss is largest exactly where it is least expected.
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 will not say about 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.
Homopeptide declines, for the 21st time, to name its synthesis house
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Independent analysis puts a WXT semaglutide lot at 98.0%, against 95.7% on the certificate
The result is unremarkable. What the report omits is not.
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.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
South Africa health authority warns on falsified liraglutide pens
Reported from the analysis, not from a warning notice.
What changed at MKM in April, and what the company will not say about it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
VendorInvestigate result on a Changsha dulaglutide lot lands 3.5 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.