Independent analysis puts a HJ dulaglutide lot at 98.7%, against 96.2% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Vendors
Page 20 of 48 of this archive, newest first.
The certificate of analysis, line by line
The purity figure is the least informative line on a well-constructed certificate and the only line most buyers read.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Zhuhai export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
A supplier suspends shipping to Italy after 24 consecutive customs detentions
The route did not close because of a rule about peptides.
What a 32% rise in coupling-reagent prices does to a 20 mg vial
Follow the resin, not the catalogue.
QSC declines, for the 4th time, to name its synthesis house
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What an 18% rise in coupling-reagent prices does to a 2 mg vial
Follow the resin, not the catalogue.
How a claim degrades between the bench and the listing
Every step between the laboratory report and the product page removes information, and the badge is the last step.
Hong Kong export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
Independent analysis puts a QST orforglipron lot at 98.0%, against 94.2% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
VendorInvestigate result on a Changsha liraglutide lot lands 3.2 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
What a 32% rise in coupling-reagent prices does to a 10 mg vial
Follow the resin, not the catalogue.
A supplier suspends shipping to France after 18 consecutive customs detentions
The route did not close because of a rule about peptides.
PeptideMeter result on a Hong Kong mazdutide lot lands 1.4 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Nantong export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
Independent analysis puts a SGN semaglutide lot at 96.6%, against 94.9% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
VendorInvestigate result on a Shenzhen semaglutide lot lands 1.1 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
A supplier suspends shipping to the Netherlands after 14 consecutive customs detentions
The route did not close because of a rule about peptides.
The named comparison we promised two years ago
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.