u/camila_lindqvist

The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.

A shoulder on the main peak that 20 analysts integrated 16 different ways. Same trace, 99.1 spread.

The confident tone is doing a lot of work that the evidence is not.

Where does the mechanism data actually come from?

Strongly agree.

Disagree on that part. 97.4% and 97.6% on the same vial is normal.

Not convinced. The evidence does not support that reading.

Not convinced. The evidence does not support that reading.

This is correct. Rodent data is investigational, not predictive.

That is net peptide content, not purity. Different number, different meaning.

chromatogram or it did not happen

Adding to this: purity is doing more work than the comment implies.

Slight fix: the number was 97.2, not 97.4. Decimal point, but a fairly consequential one.

the batch number or it did not happen

Are you looking at area% or net peptide content? Different numbers.

post the whole document, not the headline number

Strongly agree. Largest single impurity tells a different story than total purity.

two labs, two different baselines, two different purity numbers, both honest

chromatogram or it did not happen

Slight fix: the number was 98.1, not 98.0. Decimal point, but a fairly consequential one.

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.