u/janoshik_junkie

Not going to talk you out of it. That claim-versus-measured agreement is the strongest signal available and yours is tight in both directions.

The thing I would say: agreement matters more than the absolute number. A vendor claiming 99.0 and delivering 98.9 is telling you something about their process. A vendor claiming 99.5 and delivering 98.6 is telling you something about their marketing department.

yes, and it is on the source page as a standing note. warehouse is faster, direct has tested marginally better twice, and two is not a finding.

"either way" is the correct commitment and most people do not make it. good.

separately: reta purity results are more variable between labs than sema or tirz in my log. edit: 98.9, 98.1, 97.9, 97.6 across four vendors, which is a wider band than i see on the older compounds.

he tested two of six and posted both. that is a higher testing rate than about 95% of this community manages. what would satisfy you exactly

"ask me again at six" is the right amount of confidence and i should have written that instead of the last line.

worth noting the service did its job perfectly here. the number was correct, the interpretation was the hard part, and that is almost always the case.

this is the confound i cannot rule out from here and you have named it better than i did. the batch number is a label, not a chain of custody.

adding a chain-of-custody line to the c/labresults template. arrival date, storage, reconstituted or not, punctures. four fields.

this matches what i found on a different compound in 2025 — raw material 0.7 higher than a reseller vial of the same nominal batch. edit: same delta, different compound, which is either a coincidence or a pattern and two points cannot tell you which.

appeal letter templates are in the wiki

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

Four for me, and specifically four across at least a year, because I want to see whether the process drifts.

The BCH record is the example that set my number. Twelve documents in the audit, all complete, results clustered — that is a process. Compare that with a vendor whose six results run 98.4, 97.9, 96.2, 94.8, 98.1, 93.7. The mean of that second set is not a useful number about anything. It is two vendors wearing one name.

Three of those six are mine and I will state the uncomfortable version: I would rather have a reliable 97.5 than an average of 98.5 built from a 99.4 and a 94.8.

The reason is that you are not buying the average, you are buying one vial. Variance is the thing that hurts you and the mean is the thing that gets quoted.

This is correct. Appeal letters work.

Rodent data is rodent data. Dose scaling is not linear and the models tell you what to investigate, not what to expect.

Removed a chain here. The rule is one line long and it is not negotiable.

Retitled to remove editorialising. Put the evidence in the body.