Ireally don't know and was wondering the same thing. My son did the spit test this morning and it literally spread along the edge of the glass. I had him do it again and we both watched it do the same thing! What the heck does that mean? Little spit bubbles all around the circle of the glass? I took the spit test and it seemed I was in good shape but wanted to do Threelac along with my mother who I thought would benefit more because of her spit test showing stringie things. This is day 7 and I am the one with the worst die off effects while she feels just fine! It doesn't seem like the spit test is that accurate to me.