In the past 25 I have gotten one cold about every 24 months. Then about four years ago, I had bronchitis five times in a year and a half. In the midst of all the coughing, I started reading about taking an iodine supplement. I have been sick only once in the past two years, and my energy level is much better. I have used both Lugols iodine (drops), and Lugotabs (tablets).