For the benefit of others reading this thread. Uniquely, there is no built up resistance to Oil of Oregano. It outright destroys all varieties of fungi and yeasts regardless where they reside. If they are on the skin, it destroys them. If they are in our bodies, it destroys them. If they are on inanimate objects or in the air, it destroys them. Please read the books mentioned in my original post. They will educate you on how to use this product.