I had a blood work and my iodine level was near the bottom of the normal range. I also had high rT3. I got 2% Luggol's and am not sure how much to take. Last week I took 4 drops on my skin and I got diarrhea. I'm thinking one or two drops should be enough per week. On the internet some (including doctors) suggest much more, like 2 drops a day.