Independent analysis puts a TFC tirzepatide lot at 98.3%, against 95.4% on the certificate
The result is unremarkable. What the report omits is not.
Recent work
227 piecesWhy summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Twelve things a real certificate has, and what their absence means
Nothing on this page is difficult. It is simply unfamiliar, and unfamiliarity is what makes a weak certificate look like a strong one.
Independent analysis puts a QYB semaglutide lot at 98.3%, against 96.3% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
VendorInvestigate result on a Chengdu retatrutide lot lands 3.0 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
What twenty companies say about storage, and what they have measured
A stability programme needs a protocol, defined conditions, a stability-indicating method and time. Time is the ingredient no commercial testing service can sell.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Independent analysis puts a Homopeptide semaglutide lot at 98.1%, against 95.4% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Aggregation: the impurity your chromatogram dissolved before it looked
We describe each pathway in enough chemical detail to explain why it is invisible to the method the trade uses, because that is the part which has practical consequences.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Adsorption, and the dose that stayed on the glass
Bacteriostatic water contains benzyl alcohol at 0.9 per cent, which inhibits microbial growth in a preserved multiple-dose presentation. It does not sterilise a contaminated…
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Independent analysis puts a QST orforglipron lot at 96.6%, against 94.6% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
Oxidation, and the peroxide that came in with the surfactant
We describe each pathway in enough chemical detail to explain why it is invisible to the method the trade uses, because that is the part which has practical consequences.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.