Independent analysis puts a SGN dulaglutide lot at 96.0%, against 93.3% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
Analytics
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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.
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 below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
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…
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.
Medutest result on a Shenzhen retatrutide lot lands 2.4 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
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.
Medutest result on a Xianning survodutide lot lands 4.4 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
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.
Reproducibility, measured rather than assumed
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.
Five things a purity figure cannot tell you
A chromatogram is silent on everything that does not absorb: counter-ions, water, inorganic salts and non-chromophoric excipients all contribute mass to the vial and nothing…
Who signed this, and what did they undertake by signing it
Accreditation is granted for a defined scope of methods. A laboratory can be properly accredited and the test on your certificate can sit outside it.
VendorInvestigate result on a Zhuhai retatrutide lot lands 1.8 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
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.
The certificate says 2026. The vial in your hand does not say anything.
What happens to traceability when bulk material is subdivided, repackaged and relabelled two or three times before sale.
Independent analysis puts a SSA semaglutide lot at 97.6%, against 94.1% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Leucine, isoleucine, and a difference no balance can measure
Stereochemical inversion changes the molecule, changes its biology, and changes its mass by exactly nothing.
Date of analysis, date of manufacture, and the gap between them
A document is only as good as the chain that connects it to the material, and most chains here are two or three links longer than the paperwork admits.