How the vendor documentation pages are maintained, and by whom — what changed since posts 61–90
This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1 · go to the accepted answer.
Coming back to post #58, because the follow-up matters more than the original answer.
What would change my mind on vendor documentation pages is a second dataset collected by someone with no stake in the first. Until then I hold it loosely and I would rather say so than pretend to more.
Two claims get bundled together under vendor documentation pages and they need separating. The descriptive one — this is what was observed — is usually well supported. The causal one — this is why — usually is not.
Almost every disagreement in threads like this one dissolves once you say which of the two you are making.
Confirming post #64 from a second method, which matters more than confirming it from a second person.
Multiple services on one lot: agreement across two independent laboratories is stronger than a high number from one. Our vendor pages deliberately mix services for that reason.
Stating my assumptions rather than smuggling them in.
I had written a reply contradicting post #62 and deleted it. Here is what survived.
I would rather this thread reach "we do not know" about vendor documentation pages than reach a confident answer that nobody can support when asked.
A note on scope: what I am saying about vendor documentation pages applies to the case in the first post and I would not extend it further without checking.
Post #68 is the version of this I will quote in future. One addition.
I think the vendor documentation pages question is answerable and has not been answered, which is a more optimistic position than most of this thread.
Where you have no independent result, a documentation report is still worth filing: what the certificate contained, what it omitted, and how fast a request was answered.
Vendor documentation pages came up in a thread eighteen months ago and was answered well. I cannot find it, which is itself the problem, so here is the reconstruction.
I read post #69 twice before replying, because I had assumed the opposite.
What "verified" means on our pages: specific lots were independently measured on stated dates by named services and results were consistent with the supplier's documentation. It is not a recommendation and does not extend to untested lots.
I would put the burden of proof on the interesting explanation, not the dull one.
Worth stating the null on vendor documentation pages before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
Taking post #73 at face value and following it one step further.
The service matters to the interpretation. A documentation review and a chromatographic assay answer different questions and both are worth filing.
Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is water, counter-ion, and excipient. Purity and content are different. Both matter for different reasons.
The reasoning is more useful than the number, which is why I have shown it.
Post #77 put the caveat in the right place and I want to underline it.
The bit of vendor documentation pages that nobody enjoys is that the answer changes depending on what you are trying to decide with it. Say what the decision is and the thread will converge.
Agreed on all of that, and I have nothing to add to it.
Do not adjust a reported figure. Post what the laboratory said and put your interpretation in a separate sentence.
That matches what I was told, which is not the same as knowing it.
On vendor documentation pages I would separate what is worth knowing from what is worth acting on. The first list is long and the second is short, and conflating them is how threads get heated.
Post #82 is the version of this I will quote in future. One addition.
Checked the vendor documentation pages claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting the narrower scope.
The cost of a submission is worth stating. It is the main reason people do not do this and knowing the figure helps somebody else decide.
I looked this up rather than remembered it, which is the right order.
Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is water, counter-ion, and excipient. Purity and content are different. Both matter for different reasons.
That is what I would do. It may not be what is correct.
Testing service selection: Janoshik gives purity with chromatogram. Medutest gives combined purity and identity. PeptideMeter gives verification records as well as results. VendorInvestigate reviews documentation. They answer different questions.
I have changed my mind on this once already, so take it as current rather than settled.
Post #85 put the caveat in the right place and I want to underline it.
The honest answer on vendor documentation pages is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how much they matter.
Most people get the first two right and then argue about the fourth.
Narrowing post #86, because the general version has more than one answer.
The failure mode on vendor documentation pages is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple to get wrong.
Photograph the vial and the label before opening. It costs ten seconds and it is what turns a report into something checkable.
That has been true for the cases I have seen and I have not seen many.