Not sure why they would seize it. Is there a law against it? It's not a controlled substance. It's not even a prescription drug (yet). Without knowing why they have it on hold, it's hard to comment. Perhaps they have simply never seen it before and don't know what it is.
If you call them to discuss it its usually best in these circumstances not to answer anything until you've asked them enough questions to know what their concern is and whether your answers will be sufficient.
Ie. Ask first:
- Why has your shipment been placed on hold?
- What is their concern with your purchase?
- What do they know about the compound 'darolutamide'?
- Is there a law that prevents a person from buying this compound for private use?
- What do they consider acceptable or unacceptable reasons for ordering this compound?
In other words, try to feel them out first as to what their concern is and this will help you better address their concern.
Then, I suppose you could say some variant of the following:
- it's for personal use.
- it's for hobby scientific experimentation.
- you use it as a topical treatment for your hair loss.
I'm not an expert on the legality of importing Chinese compounds
I've never really had any trouble. Once I had a supplement powder held for months and they cut open the bag and I'm pretty sure tested it for coke/opioids/etc but eventually let it go through. I just had to call them and say it was a supplement for personal use and they let it through.
Sucks. Good luck.
Worse case scenario, you can ask them to send it back to the manufacturer if they won't let you have it. If they won't do that, you can let Luo know what happened and why and perhaps he can send it a different way to avoid this issue (whatever it is).