u/viktor_erdogan

Bacteriostatic or plain sterile water?

Small fix — that is net peptide content, not purity. Both are on the certificate and they differ substantially here.

annotate the weeks where something else changed

Right — the volume you add is the only variable you control here, and the cake does not change it meaningfully.

Do you have the publication or a summary of it?

Kept a log purely because so few people are logging this one. It is one person and it is not data.

Drifted up 6kg over a winter and panicked. It came back off without any change, which is apparently just what weight does.

For any compound with a thin testing history, identity is the first question. Mass spectrometry against a theoretical mass answers it; an area-percent purity figure does not.

If your calculation produces a fraction of a unit, the concentration is wrong for your dose. Change the water volume until the numbers land on whole units.

the same name covers several different molecules in this space

Careful — that arithmetic is wrong. 30mg in 3mL is 10mg/mL, so 1mg draws to 10 units, not what you wrote.

Contemporaneous records do not drift; reconstructed ones do, and the drift is systematic rather than random because memory smooths.

constipation_club is right about blanks. Silent gaps make the series lie.

That is preclinical work and the thread is treating it as a human finding.

a log is not a plan and it is not advice for anybody else

That only works if the fill weight is exactly the label weight, and it usually is not exactly anything.

The habits from the losing phase are what carry it now. That is not inspirational, it is just what happened.

I would not draw a trend line through that. Two points and a gap is not a series.

Went looking for trial data on the specific question asked here and found the population had not been enrolled.

That trial did not enrol the population you are asking about, so it cannot answer this.

write the concentration on the vial in marker, that is the whole post

the habits are the part that has to outlive the dose

Disagreeing with this bit: a two-kilo range is not drift and treating it as a problem creates one.

the goal weight you picked at week 1 was a guess

Identity confirmed, or purity only?

Yes. The habits have to outlive the dose or the maintenance phase is just a countdown.

annotate the weeks where something else changed

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

amylin and GLP-1 are not redundant pathways

Adding more water does not change how much peptide is in the vial. It changes the concentration, which changes the volume you draw for the same amount. That is the entire relationship.

What is written on the vial right now?

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

Same. I got this wrong once, caught it because the units looked absurd, and have written on every vial since.

if the maths gives you a fraction of a unit, change the concentration