Interesting, I think you can go by if you feel better when you take it or not. Maybe a protazoa expert knows better than me. It aids the immune system so much I always think it is a benefit. However it is a vinegar and vinegars are supposed to encourage candida. I think once one gets rid of candida that kombucha is such a health booster it would be a good preventative measure against getting it. I think it is the panacea, just the best thing someone could do for themselves. My friend who gave me my first culture 7 years ago is 41 and looks 18, she has been drinking it for 16 years or so. She is amazing and makes an amazing batch using berry flavored tea. How did you know you had protazoa, do I have that???