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

https://www.thistradinglife.com/health/best-oregano-oil-capsules-for-sibo-top-rated-supplements-for-gut-health-support

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.