The theory is that it is caused by the toxins given off by killed pathogens.
I did not have diarrhea until 12 drops. I backed off then moved forward when the diarrhea stopped. I moved forward to 15 drops then 15x2 and 15x3. It did not have diarrhea again until 15x3. I think it takes a lot for me to consider that Miracle-Mineral-Supplement is, in itself, toxic. Just my own experience. But the fact that it goes away even at higher doses, tells me that it is not toxic.
It could also be that the liver is becoming healthier and producing more bile.