We know that iodine is in our table salt and that we need it for our thyroid glands. That's often as far as we get. But iodine has so many functions in our bodies and can so clearly improve our overall health that it's worth taking a second look at this mineral. U.S. RDA: Between 1900 and the 1960s, iodine was used by most physicians to treat a variety of ailments. Around the early 1950s, the recommended dietary allowances (RDA) for iodine was decreased to 0.150 mg because ce