Oregano oil is a common choice for SIBO, but look for a high carvacrol...

https://kilo-wiki.win/index.php/Enteric_Coated_Oregano_Oil_Capsules_for_SIBO:_Do_They_Exist_and_Actually_Help%3F

Oregano oil is a common choice for SIBO, but look for a high carvacrol percentage. Capsules are easier to take than liquid, which can burn your throat. Most people gauge results after a 2 to 4 week cycle. Prioritize quality for your gut.