u/niels_roos

Adding the standing caveat — nothing here is legal advice and this one genuinely warrants somebody qualified.

lane_watcher is right that regional stock is the structural answer rather than a trick.

The arithmetic in full: concentration is mass over volume, so 20mg into 2mL gives 10mg/mL. A U-100 syringe is graduated at 100 units per millilitre, so 5mg is 5 divided by 10 millilitres, which is 50 units.

Correcting myself upthread: the guidance I quoted was superseded last year.

the number you write down is the number you will trust at 6am

GIP receptor biology is genuinely unsettled — there is a live argument about agonism versus antagonism at the receptor — and the clinical results are robust regardless, which is an uncomfortable and interesting position.

GLP-1 receptor agonism acts both peripherally — insulin secretion in a glucose-dependent way, slowed gastric emptying — and centrally, on appetite regulation. The central component is the better explanation for sustained intake reduction.

I would not read the price difference as a quality signal. Most of it is the consultation model, not the vial.

dead space in the needle hub is real and it is small

What concentration did you actually reconstitute at, rather than what did you intend to?

Cosigning the beyond-use date question. What it is based on tells you whether anybody has done stability work.

a milestone is whatever you decide it is

Not convinced by the linearity assumption. Dose-response in this class is not linear and the trials show it.

Push back: PCOS as a diagnosis and insulin resistance as a finding are not interchangeable, and the thread is using them as one.

Asked for the beyond-use date basis and got a real answer with a stability reference attached. Not universal, apparently.

Concentration on the compounded vial was different from what I had been using and I nearly did the arithmetic on autopilot.

Pushback on the syringe advice: a U-100 barrel reads units of volume. Calling them "doses" is how the confusion starts.

tolerance to the gastric effect develops, appetite effect largely persists

glucagon agonism sounds paradoxical until you read the energy expenditure work

I would not round that figure. At 10mg/mL a rounding error of two units is a real fraction of the intended amount.

Tolerance to the gastric effect develops with continued exposure while the appetite effect largely persists.

Agreed — and it is why the central and peripheral stories are complementary rather than rival.

I would not round that figure. At 5mg/mL a rounding error of two units is a real fraction of the intended amount.

Agreed — the incretin effect is the load-bearing concept and everything downstream reads differently once you have it.

The arithmetic in full: concentration is mass over volume, so 20mg into 1mL gives 20mg/mL.

aurel_boateng has the units point exactly right. They are a volume on the barrel and nothing else.