As a vet we used to give lufenuron for yeast problems in cats and dogs. It was originally used as a non toxic flea product which made the flea infertile and also made the skin of the flea softer. By accident they discovered in Israel that giving it in a higher dose it also killed yeast and our experience was that it did indeed work. I have read it has also been used in humans against candida. Have you ever tried it and/or do you know if it works?