Well quality of the compounder/pharmacy is the real issue here -- of course it's not that the process itself is flawed, more that it's basically impossible for a layman consumer to inspect/assess quality/safety.

How does the layman consumer inspect/assess the quality/safety of other drugs or really any other substance that they ingest?

That's a fair question - they obviously can't inspect pharmaceutical factories. That said, the FDA has much more power to regulate drug manufacturers than pharmacists and most drugs are manufactured in a few locations that are much easier to inspect. They only have to make sure one or two locations are set up correctly and a significant chunk of the application for clinical trials is quality control procedures.

There are shady online compounding pharmacies based in other countries and you don’t know what you’re getting, as with any prescription drug. I’m guessing that was he meant.

But from a reputable one regulated by an industrialized nation, it would not be fitting to call them dangerous.