The badge economy, and what it is actually certifying
Every step between the laboratory report and the product page removes information, and the badge is the last step.
Analytics in 2024
Page 3 of 10 of this archive, newest first.
Medutest result on a Suzhou tirzepatide lot lands 2.9 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
D-amino acids are invisible to mass spectrometry, and that is the whole problem
Stereochemical inversion changes the molecule, changes its biology, and changes its mass by exactly nothing.
Medutest result on a Xi'an semaglutide lot lands 3.3 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Six words a verification badge would need to mean anything
Every step between the laboratory report and the product page removes information, and the badge is the last step.
Repackaging, subdivision, and the batch number that changed hands
The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by the time a vial is opened.
Independent analysis puts a TFC tirzepatide lot at 97.7%, against 95.0% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Independent analysis puts a WXT tirzepatide lot at 96.4%, against 93.6% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Custody, condition and the temperature nobody logged
A result on one vial generalises to a batch only if the vial was drawn in a way that makes it representative — and nobody records how it was drawn.
VendorInvestigate result on a Wuxi semaglutide lot lands 2.1 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Janoshik result on a Wuxi survodutide lot lands 2.9 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Why a result on one vial says less than the trade needs it to
Every third-party report in this market describes a sample somebody chose to send. That choice is outside the laboratory’s control and outside its records.
Independent analysis puts a BCH mazdutide lot at 98.6%, against 96.0% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
VendorInvestigate result on a Guangzhou liraglutide lot lands 3.6 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
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.
Independent analysis puts a Homopeptide orforglipron lot at 99.1%, against 98.4% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
Freezing a reconstituted vial: the ice-water interface problem
We set out what is known, what is inferred and what is simply assumed about the fortnight after a vial is opened.
What the nitrogen said
Peptide content is the number that tells you how much drug is in the vial. Almost nobody sells it, almost nobody buys it, and when we paid for it on nine vials the results…
Independent analysis puts a TFC mazdutide lot at 98.4%, against 95.9% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
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.