I had a weird experience a couple of months back. About 3 months into my Iodine experience. A very runny stool, and lots of it. It was a strange colour, had a strange smell, nothing like I had passed ever before. I felt so empty after and it was if it had come from deep, like the colon or somewhere. Hard to explain, but I definitely put it down to iodine.
On a side note, I had just started intermittent fasting. Means I only eat between 12 noon and 8pm roughly. I feel since I have started that, the Iodine has worked even better, with no food interruption for 6 hours from when I take my 100mg.