TrialTracker_MD said:

My experience ordering cross-border ordering internationally: I've ordered from an Australian compounder.

I read this differently from TrialTracker_MD, on substance rather than tone. Import rules are jurisdiction-specific and this board keeps giving US-shaped answers to non-US questions. What is a personal-import allowance in one country is a controlled-import offence in another.

One concrete data point for the thread. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.

Dr.NateNeph said:

Import rules are jurisdiction-specific and this board keeps giving US-shaped answers to non-US questions.

Coming at Dr.NateNeph’s question from a different direction. Most of what circulates confidently in this community traces back to one summary of one study, and the qualifier was dropped somewhere in the third retelling.

One thing that is still open after gary_naperville’s answer:

How would you tell the difference between that and the alternative explanation?

Closing the loop on my own question.

Late follow-up. I did not do what was suggested, I did something adjacent, and it worked; posting the difference in case it matters to somebody.