June 2025

When to stop escalating and when to stop entirely

The ceiling varies severalfold between people, and nothing measurable at baseline predicts where it sits.

Gastric emptying is a mechanism, not a side effect

The central effects are not a bonus. On the current evidence they are the principal mechanism of weight loss.

What the trials counted as intolerance

Trial discontinuation figures are a floor, not an estimate: trial populations are supported in ways ordinary patients are not.

The restart nobody plans for

We work through the residual-exposure table so the decision can be made from numbers rather than from feel.

The mechanism behind the mechanism

The clinical effect profile is almost fully predictable from where the receptor is expressed, which is unusual and useful.

From cell to clinic: where the extrapolation stops being safe

Receptor pharmacology is strong on average effects and almost silent on individual variation. That gap is where most reader…

The eighteenth month, and the conversation that should have happened in the third

What the trials measured was continuation against withdrawal. What patients want to know is continuation at a lower dose, and…

The certificate of analysis, line by line

The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are…

Chain of custody, and where it begins

Every third-party report in this market describes a sample somebody chose to send. That choice is outside the laboratory’s…

The submitted sample: the weakest link in the whole system

Every third-party report in this market describes a sample somebody chose to send. That choice is outside the laboratory’s…

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.

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…

What we asked twenty suppliers about stability data

A retest date says that material should be re-examined before use. An expiry date says it should not be used. The trade uses the…

Reading a certificate as a document rather than as a score

The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are…

Every fortnight, every third week, seasonally: an unstudied practice

An absence of evidence is not evidence of harm. It is also not a licence.

A reference interval is not a target, and a result outside one is not a diagnosis

Almost every misreading of a laboratory panel is a misunderstanding of what a reference interval is and how much a result has to…

What the older diet-and-exercise trials found in the hip

A plausible mechanism, a measurable change, and no outcome data. This is what an open question looks like.

SURMOUNT-2 was built to answer the stopping question, and it did

Three randomised withdrawal designs have tested what happens when treatment stops. Their results are consistent and they are…

The three-times-upper-limit convention, and where it came from

What the renal and hepatic outcome programmes actually measured, and over what duration.

What the protein literature actually shows, and in whom it was shown

Where the familiar figures come from, what populations they were measured in, and how far the extrapolation reaches.

Coming off: what the pharmacology permits

What a slow reduction could plausibly buy, and what it certainly cannot prevent.

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.

Twenty-eight days is a number from somebody else’s product

An in-use period is established by a dedicated study on a specific formulation in a specific container at a specific…

One method is one opinion

Where two methods disagree, the conservative convention is to report the lower figure. It is not universal, and whether a…

Resolving power and mass accuracy are two different specifications

Parts per million sound impressive until they are converted into daltons at the molecular weight of the thing being measured.

Same mass, different molecule: why identity by mass is not identity

Reversed-phase chromatography runs in an organic, acidic mobile phase that dissociates most non-covalent aggregates on the way…

Date of analysis, date of manufacture, and the gap between them

The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by…

What we asked twenty suppliers about stability data

A retest date says that material should be re-examined before use. An expiry date says it should not be used. The trade uses the…

Deamidation, oxidation, and the two shifts worth memorising

What would be needed to catch each of these, and what it would cost.

The arithmetic of a step: what doubling a dose actually asks of you

The four-week step exists because four to five weeks is approximately how long a once-weekly drug takes to stop rising at a…

Why your laboratory interval differs from the one in the textbook

A flag is a probability statement about a population. It is not a statement about the person holding the printout.

Falling ferritin is not always falling iron

The panel drawn during a week of vomiting is measuring the vomiting.

Pancreatitis, obstruction, gallbladder: three things nausea can be

A small number of serious gastrointestinal events occur in people taking these drugs. Distinguishing them from the expected…

Vitamin D, adiposity, and a volume-of-distribution problem

Reduced intake is a plausible mechanism for deficiency. Reduced absorption is not, and the two are conflated in most of the…

Sarcopenia is a diagnosis, not a synonym for losing lean mass

A tour of the source literatures, with an assessment of how far each legitimately reaches.

The convention nobody explains before handing over the vial

Insulin syringes are graduated in units on a convention that fixes 100 units to one millilitre. That convention says nothing…

Escalating onto a rising curve

The four-week step exists because four to five weeks is approximately how long a once-weekly drug takes to stop rising at a…

Maintenance dosing: what is licensed, what is practised, and what is evidenced

Dose reduction is not withdrawal, and the trials that tested withdrawal cannot be read as testing it.

Two-thirds back: the extension nobody expected to be the headline

The evidence on stopping is better than the evidence on almost anything else in this field, because somebody deliberately…

How a claim degrades between the bench and the listing

Every step between the laboratory report and the product page removes information, and the badge is the last step.

The dose that got you here and the dose that keeps you here

Every withdrawal trial compared full dose against nothing. The clinically interesting comparison — full dose against a reduced…

The named comparison we promised two years ago

Two years ago we ran an anonymised version of this comparison and promised a named one. This is it, with every method printed in…

From vial to bench: what is recorded and what is assumed

The condition on arrival is recorded by some services and not others, and it is one of the more informative lines in a report.

How a claim degrades between the bench and the listing

Every step between the laboratory report and the product page removes information, and the badge is the last step.

The lead-in, the randomisation, and the year that followed

A withdrawal trial answers a narrower question than it appears to. This piece states which question.

The one randomised trial that combined an incretin with supervised exercise

Mass and function are different endpoints and training affects them differently. Most coverage treats them as one.

Which results should be repeated before they are investigated

What the pivotal programmes measured and how often, which is a more defensible template than most published monitoring schedules.

Storage after reconstitution, and the evidence behind the numbers

A needle blunts on first use. Reuse is uncomfortable, and it is a documented contributor to lipohypertrophy.

Bacteriostatic water, sterile water, and the 0.9 per cent that makes the difference

We set out what is known, what is inferred and what is simply assumed about the fortnight after a vial is opened.

Why a dry powder is a chemical reactor with the volume turned down

Residual moisture is measured routinely in regulated manufacture, is reported almost nowhere in this trade, and predicts…

The ionisation line on a report is the most informative line on it

The ionisation method determines the charge states you see, the adducts you must account for, and the modifications you might…

Units, millilitres, milligrams: three scales on one small object

We work through the arithmetic in full, because it is short, and because the errors it prevents are order-of-magnitude errors.

Hydrolysis, isomerisation, and the arithmetic of a broken bond

Deamidation, oxidation, aggregation and hydrolysis account for nearly all of what happens to a peptide over time. Each has a…

Gauge, pain and flow rate

The insulin injection-technique literature is large, well conducted and directly transferable on questions of depth and tissue.…

The eighteenth month, and the conversation that should have happened in the third

The dose-response curve in this class flattens near its top. That has direct consequences for whether the final rung is worth…

Assay against a standard, or area per cent: two different questions

We asked the four independent testing services what standards they run against and what suitability criteria they apply. The…

Four millimetres is enough, and the data says so

The insulin injection-technique literature is large, well conducted and directly transferable on questions of depth and tissue.…

The tolerance was set by whoever wrote the certificate

The arithmetic of significant figures, applied to a document that routinely reports four of them.

Mapping a rotation that you will actually follow

A rotation scheme that is too complicated will not be followed. We describe the simple ones that are.

The figure of merit this trade chose, and the four it did not

A market that competes on one measurement will optimise that measurement. There are legitimate ways to raise a purity figure…