Worth repeating that this is not medical advice and the answer often depends on who you are.

Name the active ingredient, not just the brand. It makes these threads searchable years later.

Narrow conclusion, briefly right. Broad conclusion, interestingly wrong. I know which I keep choosing.

Test one thing at a time. It feels slower and it is the only way to learn anything.

Followed, this answered three questions I had.

Name the active ingredient, not just the brand. It makes these threads searchable years later.

Pinned, and mentioned in the rules thread so the next person finds it.

Moved rather than deleted. The reason is in the thread.

How do you tell the difference between the drug working and just a good week?

Ten percent cuts, of the current dose not the original. That is the arithmetic that keeps it survivable.

Do you contact the customs office or the carrier first?

Loose evidence is not nothing, but a washout either side is the only reason to trust your own take.

No referral links. Shortened links and tracking parameters are the usual offenders.