Iodine can relieve breast pain, ovulation pain, premenstrual mood symptoms and help to prevent ovarian cysts. It works by promoting healthy estrogen metabolism, down-regulating estrogen receptors, and stabilizing estrogen-sensitive tissue in the breasts, uterus, ovaries, and brain. As one paper says, iodine has “a net anti-estrogenic effect.”
Iodine’s anti-estrogen effect makes it one of the best treatments for estrogen excess or “estrogen dominance”—although I don’t use that term.