Has anyone dealt with is there a way to verify if a vendor has been fda warning-lettered??

Clinical perspective, offered as context rather than as advice. The distinction that resolves most of these threads is between what is true on average and what is true for one person. Both are real; they answer different questions and get quoted as if they were the same one.

Dr.EndoIndy said:

The distinction that resolves most of these threads is between what is true on average and what is true for one person.

Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. Pushing back on the consensus forming here. Consistency is not the same as correctness, and a board that agrees with itself quickly is usually agreeing with the first person who sounded certain.

Dr.EndoIndy said:

The distinction that resolves most of these threads is between what is true on average and what is true for one person.

That is right for the common case. Whether it is right for the case being asked about depends on a detail that has not been given.

Dr.EndoIndy said:

The distinction that resolves most of these threads is between what is true on average and what is true for one person.

Thank you — that is the clearest version of this I have read, and I have read a lot of them.

Moderator note: the sourcing question belongs in the vendor section and has been split out. No action needed from anybody.