I use stevia often, and also follow a candida diet. The stevia itself doesn't seem to aggravate the yeast, but as we know, anything we use in the diet too often can become a problem because the food allergies associated with leaky gut from candida. It took me awhile to realize how these food allergies were presenting themselves(I mistook them for candida when it was just causing the symptoms). Thick, slimey mucous, pain in joints etc., discharge. Yet, as far as the usual allergy symptoms, runny nose,itching eyes etc. I didn't have any. I thought for a bit it was the stevia until I started to rotate what I used it in(ex; instead of sweetening kefir, I would use it in soy milk) symptoms didn't occur, so it wasn't the stevia. You must also be careful, I have found, how the stevia is blended. i have no problems with Kal pure stevia, but some brands combine it with maltodextrin(big no-no), or corn vegetable glycerine(also causes symptoms). HTH