Dosing: I started off with 1 tablespoon/day, though I worked up to that level (starting with 1 drop). See My Recovery Story - I can work again, minimal suffering from lingering symptoms … I can’t remember if I put the details in that post though.
Extracts: Ok with some sleazy companies, they use super cheap extracts and sell you pretty much zero active ingredient. I never really collected data on extracts. However, I’d probably just go with the oil because it has been eaten as a supermarket food, it’s cheap, a tablespoon is a lot, etc.
There are a bunch of molecules in the oil that does stuff. see 🌿 Carvacrol, a biofilm-fighting phytochemical found in oil of oregano (and black seed oil)
Keep in mind that people have different experiences with all of these things… and it’s probably the nature of the condition. The treatment/intervention may make you worse off, in which case you should stop.