from "Iodine, Why You Need It, Why You Can't Live Without It":

"It was thought that the intestinal tract could easily convert Iodine to iodide, but research has shown this is not true. Different tissues of the body respond to different forms of iodine. The thyroid gland primarily utilizes ioDIDE....the breasts, on the other hand, primarily utilize ioDINE....

Because different tissues concentrate different forms of iodine, using a supplement that contains both Iodine and Iodide is preferable to using a supplement that contains only one form, As mentioned above, the breasts concentrate iodine. The prostate gland concentrates iodine. The thyroid gland and the skin primarily concentrate iodide. Other tissues, including the kidneys, spleen, liver, blood, salivary glands and intestines can concentrate either form. With different tissues responding to different forms of iodine, it would make common sense that a greater therapeutic benefit from Iodine will be achieved by using a COMBINATION OF IODINE AND IODIDE. My clinical experience has proven, beyond a doubt, that a combination of IODINE/IODIDE (e.g., Lugol's or Iodoral) is much more effective than an Iodide only supplement(e.g., SSKI and most other liquid Iodide formulations)."

There ya have it, folks, Lugol's or Iodoral .... :)