The general consensus seems to be that oil of oregano is a relatively safe and effective antifungal. Read up before using it, because used improperly it can cause burning in the mouth and an upset stomach. ALSO, oil of oregano is also a strong antibacterial, as well as an antifungal. It is quite possible that oil of oregano will kill the probiotics along with the candia. So, be certain that your treatment plan takes that into consideration.