Accuracy, precision and the tolerance nobody states
Parts per million sound impressive until they are converted into daltons at the molecular weight of the thing being measured.
TheCompound Journal
Reporting on incretins, compounding & the peptide supply chain
Everything filed in June 2026, the month of Volume 3, Number 6. The issue itself — cover, editor’s letter and table of contents — is here.
Parts per million sound impressive until they are converted into daltons at the molecular weight of the thing being measured.
A design note rather than a result: what the comparator was, and what that permits you to conclude.
The evidence base is thin and the document says so, which is to its credit.
A proper account of an operation that existed, and of what closing it cost.
The air shot before a pen injection removes air from the cartridge and confirms flow. Skipping it can mean a materially reduced dose, and it is skipped constantly.
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.
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
The document is four pages. Three of them are about dates.
The observation that closes a facility is rarely the dramatic one.
Efficacy was never the question in this appraisal. Duration of treatment was.
The regain trajectories, arm by arm, with the estimands named.
We work through a single chromatogram twice, under two integration conventions, and show where the difference comes from.
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
The evidence base is thin and the document says so, which is to its credit.
A proper account of an operation that existed, and of what closing it cost.
Efficacy was never the question in this appraisal. Duration of treatment was.
An isoaspartate rearrangement changes the molecule and not the mass. A method that confirms identity by molecular weight alone will report it as the parent compound.
What the labels permit, what clinicians do, and the size of the gap between them.
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
The document is four pages. Three of them are about dates.
The observation that closes a facility is rarely the dramatic one.
Efficacy was never the question in this appraisal. Duration of treatment was.
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.
Weight reduction in the long programmes flattens at roughly sixty to seventy-two weeks. The timing is consistent, predictable and almost never mentioned in advance.
Concentrations fall by half a week, so a month away leaves a small fraction of steady state. Resuming at the previous dose presents the receptor with a step it has not seen…
The document is four pages. Three of them are about dates.
The observation that closes a facility is rarely the dramatic one.
The result is unremarkable. What the report omits is not.
One randomised trial has combined a GLP-1 receptor agonist with supervised exercise. Its result is the single most useful piece of evidence in this area.
The observation that closes a facility is rarely the dramatic one.
The document is four pages. Three of them are about dates.
Reported from the analysis, not from a warning notice.
A design note rather than a result: what the comparator was, and what that permits you to conclude.
We looked at what the dose-ranging data supports about going higher, and it is thinner and less flattering than the market assumes.
What was withdrawn, from whom, after how long, and what was measured afterwards.
A proper account of an operation that existed, and of what closing it cost.
The route did not close because of a rule about peptides.
Follow the resin, not the catalogue.
A reminder that a purity figure is the output of a method, and that methods differ.
We set out the questions that distinguish a symptom to manage from a dose to change.