Adding the clinical framing, because it changes how the question reads. There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.
Adding the numbers, since they settle part of this. One practical note: write down what you did and when, before you need it. Reconstructing a timeline from memory three months later is how people end up unable to answer the one question that would have resolved it.
One thing that is still open after labquiet_amy’s answer:
How people are distinguishing a supplier having a bad batch from a supplier on the way out?
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View Resultsbri_stats said:One practical note: write down what you did and when, before you need it.
I read this differently from bri_stats, on substance rather than tone. This treats a plausible mechanism as a demonstrated one. Plausible is where you start looking, not where you stop.
Moderator note: two posts asking for a source have been merged into one. Please search the thread before asking again. Carry on.