JEEP names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Certificates of analysis
Page 9 of 51 of this archive, newest first.
A percentage is not a specification
This piece takes the measurement apart into the decisions it is made of, because each decision moves the answer.
A certificate is a snapshot, and peptides do not stand still
What happens to traceability when bulk material is subdivided, repackaged and relabelled two or three times before sale.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Who signed this, and what did they undertake by signing it
A manufacturer’s certificate is a self-declaration. An accredited laboratory’s report is a third-party measurement. The trade prints both under one heading.
Independent analysis puts a BCH orforglipron lot at 97.2%, against 93.1% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Janoshik result on a Changsha tirzepatide lot lands 0.8 points above the supplier’s stated figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Singapore health authority warns on falsified exenatide pens
Reported from the analysis, not from a warning notice.
What changed at WXT in February, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Freezing a reconstituted vial: the ice-water interface problem
An in-use period is established by a dedicated study on a specific formulation in a specific container at a specific concentration. Borrowing one from a marketed product is…
Norway health authority warns on falsified exenatide pens
Reported from the analysis, not from a warning notice.
KP names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Independent analysis puts a JEEP mazdutide lot at 98.9%, against 97.7% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
HJ names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Same material, different gradients, different answers
Two years ago we ran an anonymised version of this comparison and promised a named one. This is it, with every method printed in full.
What Medutest charges to answer the pyrogen question
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 badge economy, and what it is actually certifying
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.
TFC names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Independent analysis puts a ERP tirzepatide lot at 98.1%, against 95.1% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
Adsorption, and the dose that stayed on the glass
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.