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

https://highstylife.com/what-carvacrol-percentage-should-i-look-for-in-oregano-oil-capsules-for-sibo/

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.