I have had the most severe cyclic mastalgia for 15 years. I mean really, really bad. Huge swollen breasts that make me shy away from the kids when they approach for a hug, yelling "ouch" when in bed with my husband (not sexy), and just plain misery for weeks. It kicks in usually about three days after my period ends, for the entire month I am either having my period or having mastalgia. I've tried two other brands of progesterone creams and they had no effect whatsoever. I have ordered some of your product, but it hasn't even got here yet. The real miracle is this...... in all my travels on the internet yours is the first website to ever mention iodine deficiency has a link to sore breasts. I couldn't believe it, I thought I was never going to be free of my problem. I have taken iodine supplements for four days now, as well as eaten a few servings of roast seaweed every day, and MY MASTALGIA HAS DISSAPPEARED!!!!!!!! My period is due next week and this is usually the worst part, shooting pain, swelling, constant agony. I am so happy. Thank you thank you thank you from the bottom of my heart. I'm looking forward to starting the cream when it gets here because of heavy periods. I feel so much better already. I am truly grateful. I have had 15 years of the severe mastalgia and for the first time I feel good.