I've learned a lot over the years from Byron Richards over at Wellness Resources. But he is no fan of large doses of iodine, especially potassium iodide. This also is on the website --
"Caution: We have received numerous reports of people taking 25 mg to 50 mg of potassium iodide-containing supplements each day, typically in the form of Lugols or Iodoral. I do not support the use of this protocol as the form of iodine used is inferior and the chance of congesting the thyroid with insoluble potassium iodide is elevated - a needless risk to take for any person trying to improve their health. I have never had any trouble helping people balance thyroid function on far less iodine intake, especially when synergistic thyroid support nutrition is used."
That being said, I have used Iosol in the past. For all I know, I still have the rest of the bottle in the back of my cupboard. I did not do well on it, even with just 4 drops. Naturally, the more I took, the worse I felt. From my experience, it didn't fit well with my body. On the other hand, I've done very well with upwards of 150 mg Iodoral and several hundred milligrams of potassium iodide. I used Iodoral because the Lugol's bothered my stomach.
Is Iosol safe in high doses for you? Maybe. I just don't know. The bulk of our experience is with Lugol's, Iodoral, and potassium iodide or SSKI. Occasionally some have posted about using Iosol, so you might search on Iosol within this forum to see if anything resonates with you.