The prostate requires large amounts of iodINE (vs. iodIDE).
http://www.tahoma-clinic.com/estrogen2.shtml (Jonathan Wright)
"It has been my clinical observation, not published in the scientific literature, that when women have low estriol and more estrone and estradiol - remember Dr. Lemon's theory that low estriol levels represent a cancer risk - added iodine helps to raise the levels of estriol and concomitantly lower the levels of estrone and estradiol (which are more procarcinogenic). I don't know how it works, but I've seen it work enough times since I first observed it in the 1970s that I know it's true."
http://www.mbschachter.com/Iodine.htm
"… 2 drops of the Lugol’s solution contains 5 mg of the reduced elemental form of iodINE (preferred by the breast, ovary and prostate) and 7.5 mg in the iodIDE form (preferred by the thyroid gland)."
http://www.anticancerinfo.co.uk/Iodine.htm
"The thyroid gland primarily uses iodide as does the skin; the breast and prostate glands use iodine; and other tissues including the kidneys, spleen, liver, blood, salivary glands and intestines can use either form."