Freely accessible knowledge is abundant, for now. For instance, someone with overly high BP wouldn’t want to consume much ginger, for digestive issues. Or simply, “contraindications of ginger”.

Good, don’t lol

Lots of people do know a lot about these things and were previously hindered by an inability to manufacture the drugs themselves.

There are plenty of docs and chemists who would willingly do this underground because they actually want to help people.