Oregano oil is a common choice for SIBO thanks to carvacrol, but form matters....

https://www.pop-bookmarks.win/managing-sibo-often-involves-exploring-targeted-herbal-protocols-many-people

Oregano oil is a common choice for SIBO thanks to carvacrol, but form matters. Many prefer capsules over liquid to avoid the potent taste. If you are working with a practitioner, a 2 to 4 week window is a typical timeframe to assess your comfort.