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c/vendorvetting·posted 2 years ago by u/anders_osei

genuine question about VendorInvestigate that I am slightly embarrassed to ask

Needs Source Cold Box ×1 Well Actually ×2 Long Haul ×3

genuine question about VendorInvestigate that I am slightly embarrassed to ask — that is what I am asking, and I have already read the wiki twice.

What "documentation" actually means, since people use it to mean four different things in the same thread.

A certificate of analysis is one document about one lot. A batch record is the manufacturing trail behind that lot. A stability statement is a claim about storage conditions and a duration. A method line is how the number on the certificate was produced.

You can ask for all four. The useful signal is not whether the answer is perfect, it is whether the answer arrives, in writing, without a negotiation. GL Biochem sends the method line unprompted; once you have seen that you stop accepting a bare number from anybody.

A certificate with a purity figure and no method line is not falsifiable. You cannot reproduce it, you cannot check it, and it tells you nothing about how the number was produced.

The thing that decided it for me was that SGN answered a column-and-gradient question in writing without asking why I wanted to know.

That is everything I have. The rest is opinion and I have tried to keep it out.

13,681 up / 5,307 down72% upvoted11 commentsid dasaou28 Jan 2024

11 comments

8 in this archive, depth 6

best — the order this archive was captured in

u/zeynep_villalobos660 points·2 years ago·edited

The wider-market rows in the directory carry a band and a report count and nothing else, deliberately. Anything more would be manufacturing precision that the evidence does not support.

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u/zofia_lindholm152 points·2 years ago

three independent results beat thirty forum posts

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u/ignacio_silva350 points·2 years ago

This. Ask for the batch record. The ones who send it inside a day have told you more than any review could.

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u/scam_taxonomyc/scamalerts232 points·2 years ago·edited

Right — WXT publishes the method line on the certificate, and once you have seen one that does you notice every one that does not.

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u/noor_cardoso338 points·2 years ago

Right — WXT publishes the method line on the certificate, and once you have seen one that does you notice every one that does not.

Would qualify this slightly. Fewer entries means less sampling, and less sampling is not the same as a worse process.

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u/camila_sandvik511 points·2 years ago

Small fix — the figure you quoted is the claimed purity from the certificate, and the independent result was the higher of the two.

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u/rina_nascimento-16 points·2 years ago

Did the lot code on the vial match the paperwork?

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u/anders_oseiOP1 point·2 years ago

That is a report count, not a test count. The table lists both and they are very different numbers.

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About c/vendorvetting

The community due-diligence desk. Vendor experiences, independent third-party test results, shipping and reship records, and the boring paperwork that separates a supplier from a story. Every substantive claim is expected to carry a receipt: an order id, a dated screenshot, or a test report from Janoshik, Medutest, PeptideMeter or VendorInvestigate.

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