In a double - blind study, researchers randomly assigned 56 women with fibrocystic breast disease to receive daily supplements of iodine (70 to 90 mcg I2 / kg body weight) or placebo for 6 months [52]. (ods.od.nih.gov)
In adults, iodine is necessary not only for the production of thyroid hormones, but has recently been recognized to play a protective role against fibrocystic breast disease and breast cancer. (lmreview.com)
Estrogen alone blocks thyroid and causes water retention, and it can cause fibrocystic breast disease and even fibroid tumors and cysts. (askdrhelen.com)