The C-cell question: rodent findings and their human context posts 31–46

On the "does it stop working" question: tolerance in the pharmacological sense is not what the withdrawal trials show. What they show is that the effect persists while treatment continues and reverses when it stops, which is a different finding with different implications.

That is the honest state of it as of this week.

Solutions of semaglutide can look faintly opalescent without anything being wrong. Visible particulate, fibres or frank cloudiness are a different observation entirely and are worth raising with the supplier rather than reasoning about.

It is the kind of thing that is obvious once and never again.

Acknowledging rather than arguing. The reasoning holds as far as I can follow it.

Worth separating two things this subcategory keeps merging: what the molecule does, which is reasonably well characterised, and what a particular vial contains, which is a documentation question and has nothing to do with pharmacology.

That much is documented. The rest is how I have interpreted it.

Discontinuation rates in the trials are worth reading alongside efficacy and almost never are. A large mean effect in a population where a meaningful fraction stopped early is telling you two things, not one.

Where I would look next, rather than where I would stop.

Distinguishing three things in the c-cell question discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation that gets attached to both.

Picking up post #35: that is the part I would want checked first.

An update on my earlier c-cell question post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.

Injection site does not appear to matter much for semaglutide exposure. The published comparisons of abdomen, thigh and upper arm found differences small enough to be clinically unimportant, which is not true of every injectable.

This follows post #39 rather than contradicting it.

On c-cell question the community has more anecdote than the confidence in this thread implies, and I include my own contribution in that.

Worth separating two things that post #38 runs together.

Worth separating two things this subcategory keeps merging: what the molecule does, which is reasonably well characterised, and what a particular vial contains, which is a documentation question and has nothing to do with pharmacology.

A single observation, in a thread that deserves better than single observations.

Careful with the language on c-cell question. "Not detected" and "not present" are different findings and the first is a statement about the method.

Two questions I would want answered before drawing anything from the c-cell question data above: how were the cases selected, and what happened to the ones that dropped out.