I have never heard of this product, but I think this article explains how yeast affects the skin and other organs. I also found the other article very interesting.
Katie doesn't have an problems with itchiness, but I use Probiotic Max from this company for Katie to help with digestion and her overall health. I highly recommend this company. The itchiness could also be caused by a food allergy, so you could try a limited ingredient diet first.
Systemic Yeast Infections in Dogs | Natures Farmacy Inc. THE FORGOTTEN ORGAN IN OUR BODIES??? DO YOU KNOW WHAT IT IS? | Natures Farmacy Inc.