The oregano oil in that product is an excellent antifungal. I also, am allergic/bothered by yeast. Kinda found out by trial and error. I noticed after I ate bread, or anything at all with yeast, I felt bloated, pains in my belly that night, and the next day may need more trips to the bathroom. My doctor thought it was all in my head, by the way. Dummy. I now have to read all labels because yeast extract is in a LOT of processed foods. I am a firm believer that fungus/yeast is the cause of a lot health problems. After I got rid of the fungus/yeast overgrowth in my body, my UC symptoms virtually disappeared. I still take caprylic acid or olive leaf extract for maintenence. Probiotics are also a big hit with me. You may also want to eliminate yeast and grains for awhile if you decide to try it, for maximum benefit.