For fibrous breasts, there’s a great deal of anecdotal evidence out there that certain supplements and diet changes may help, but very little proven scientific research. Many women find relief when they avoid caffeine, chocolate, and fatty foods, and supplement with primrose oil (most naturopathic docs recommend 1,000 mg 3 times a day, but check with yours to be sure), iodine (or eat iodine-rich sea vegetables on a regular basis), vitamin E, and magnesium. In supplementing, I would suggest no more than the recommended tolerable upper limits found in the tables here.