jim_asheville said:

The pattern that distinguishes a bad batch from an exit is behaviour rather than product.

International shipping tracking for cross-border ordering orders: my experience with customs in the US when ordering from overseas:

Required FDA import alert review, delayed 10 days.

Tips: always include a copy of your prescription, declare medication properly on customs forms, keep quantities reasonable (personal use = 3 month supply max), and use a vendor who has experience shipping to your country.

JenMemphis said:

Agreed, with a caveat about community reputation: it is a lagging indicator.

This answered a question I did not know how to ask. Taking it to my next appointment.

jim_asheville said:

The pattern that distinguishes a bad batch from an exit is behaviour rather than product.

I disagree that testing history is decisive. It tells you what a supplier did when they were being watched. Continuity of behaviour under stress — a late shipment, a failed test, a complaint — is more predictive than any run of good results.

One concrete data point for the thread. The boring version of this is the one that works, and the boring version is: measure a baseline, change one variable, wait, measure again under the same conditions. Nobody wants that answer and it is still the answer.

Worth separating that from vendor vetting, which this thread keeps folding into the same question. They behave differently and the advice does not transfer.

Moderator note: two posts asking for a source have been merged into one. Please search the thread before asking again. Report rather than reply if it drifts again.