The retest date and the expiry date are not the same document
We asked twenty companies three questions about stability data and print every answer, refusal and non-response.
TheCompound Journal
Reporting on incretins, compounding & the peptide supply chain
Everything filed in May 2026, the month of Volume 3, Number 5. The issue itself — cover, editor’s letter and table of contents — is here.
We asked twenty companies three questions about stability data and print every answer, refusal and non-response.
Efficacy was never the question in this appraisal. Duration of treatment was.
A proper account of an operation that existed, and of what closing it cost.
The evidence base is thin and the document says so, which is to its credit.
A stability programme needs a protocol, defined conditions, a stability-indicating method and time. Time is the ingredient no commercial testing service can sell.
The trials studied planned withdrawal. Almost nobody stops that way.
Efficacy was never the question in this appraisal. Duration of treatment was.
A proper account of an operation that existed, and of what closing it cost.
The evidence base is thin and the document says so, which is to its credit.
Follow the resin, not the catalogue.
Gradient slope is the single most consequential method parameter for a reported purity figure, and it is the one most often omitted.
We separate what is supported, what is reasonable, and what is folklore, and we do not pretend the boundaries are crisp.
The document is four pages. Three of them are about dates.
The observation that closes a facility is rarely the dramatic one.
The document is four pages. Three of them are about dates.
A design note rather than a result: what the comparator was, and what that permits you to conclude.
Reduced intake is a plausible mechanism for deficiency. Reduced absorption is not, and the two are conflated in most of the advice.
What the trials measured was continuation against withdrawal. What patients want to know is continuation at a lower dose, and that study has largely not been done.
A design note rather than a result: what the comparator was, and what that permits you to conclude.
Reported from the analysis, not from a warning notice.
The observation that closes a facility is rarely the dramatic one.
The evidence base is one secondary analysis, several small studies and a large amount of extrapolation from bariatric surgery.
A supply interruption is a discontinuation with no notice, no taper and no plan. That is a distinct clinical situation.
The condition on arrival is recorded by some services and not others, and it is one of the more informative lines in a report.
Follow the resin, not the catalogue.
Reported from the analysis, not from a warning notice.
A proper account of an operation that existed, and of what closing it cost.
The document is four pages. Three of them are about dates.
The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin the assay cannot see.
The result is unremarkable. What the report omits is not.
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
The observation that closes a facility is rarely the dramatic one.
The evidence base is thin and the document says so, which is to its credit.
Purity, content, identity, sterility and endotoxin are five separate determinations. A single sheet of paper carrying one of them is not evidence about the other four.
The older-adult diet-and-exercise trials are the closest analogue to rapid pharmacological weight loss, and they are twenty years old.
A design note rather than a result: what the comparator was, and what that permits you to conclude.
The route did not close because of a rule about peptides.
The observation that closes a facility is rarely the dramatic one.
Real-world persistence figures, with their definitions stated, because the definitions are doing most of the work.
Two withdrawal-design trials tell us what happens when treatment stops. Neither tells us what the lowest effective maintenance dose is.