u/receptor_bias_rick

Disagreeing with this bit: registration is not equivalence, and the two get run together constantly.

This is the distinction the whole board runs on. Everything else follows from it.

do not assume the concentration matches the branded product

Disagree that a lower number is automatically worse. A conservative claim that survives testing is worth more than an optimistic one that does not.

measurements beat photographs for actually tracking anything

Net peptide content is the fraction of the powder that is actually peptide once counterion, water and residual solvent are accounted for. A 99% pure acetate salt can still be about 85% peptide by mass.

On means, which this board treats as targets and which are nothing of the sort.

A reported mean body weight change is the centre of a distribution that in these trials is very wide. Substantial numbers of participants did much better, and substantial numbers did considerably worse while remaining on the drug and in the analysis.

Quoting the mean as an expectation therefore misleads in both directions: it makes ordinary results look like failures and it makes exceptional results look normal. If a paper publishes the distribution — and several do, in the appendix — look at that instead. It is far more informative than the number in the abstract.

Area percent is the peak area of your compound over the total integrated area, at one wavelength, on one gradient.

zaid_balogun has the distinction right — one is a fraction of the detector signal, the other is a fraction of the mass.

do not assume the concentration matches the branded product

Did you ask for the batch-specific document, or is this the catalogue one?

Same view. WWB prints the column and the gradient, which means somebody could actually reproduce the run.