What changed at QSC 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.
Certificates of analysis
Page 26 of 51 of this archive, newest first.
Janoshik result on a Guangzhou retatrutide lot lands 2.2 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Six words a verification badge would need to mean anything
Lot-level verification with a public report is a real and achievable thing. It exists in this market, on a minority of listings.
Calibrated, qualified, accredited: three words that are not synonyms
An assay against a quantitative reference standard measures how much is present. Area per cent measures what proportion of the visible material is the parent. Only the first…
Where the solvent front ends is a decision, not a fact
Regulated pharmaceutical practice has explicit reporting, identification and qualification thresholds. This trade has none, which is why a purity figure carries no…
Twenty-eight days is a number from somebody else’s product
We set out what is known, what is inferred and what is simply assumed about the fortnight after a vial is opened.
Independent analysis puts a KP liraglutide lot at 95.5%, against 91.6% on the certificate
The result is unremarkable. What the report omits is not.
What changed at JEEP 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.
Independent analysis puts a QSC orforglipron lot at 97.3%, against 94.6% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
France health authority warns on falsified tirzepatide pens
Reported from the analysis, not from a warning notice.
Janoshik result on a Xianning tirzepatide lot lands 1.3 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
What changed at QST 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.
How a claim degrades between the bench and the listing
Lot-level verification with a public report is a real and achievable thing. It exists in this market, on a minority of listings.
A tested vial is evidence about a vial
Chain of custody, in a regulated setting, begins at sampling. Here it begins when the package arrives.
Four ways a peptide comes apart
The sequence predicts the failure mode. A methionine predicts oxidation; an asparagine followed by a glycine predicts deamidation; a cysteine predicts disulphide scrambling.
The arithmetic behind every identity confirmation, worked in full
A peptide has a monoisotopic mass and an average mass, they differ by several daltons at this molecular size, and a certificate that does not say which it quotes cannot be…
LAL, kinetic chromogenic, recombinant factor C: three ways to the same figure
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 cake is a record of the cycle that made it
Lyophilisation does not stop degradation. It slows every pathway by removing the solvent that most of them require, and the residue of solvent that remains sets the rate.
Medutest result on a Tianjin semaglutide lot lands 2.4 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
The Netherlands health authority warns on falsified liraglutide pens
Reported from the analysis, not from a warning notice.