Dr Derry from Vicotria on Vancouver Island has a book out about Breast Cancer and his research shows that taking 1 to 2 drops of iodine a day in a glass of water can help to prevent breast cancer. His book is very informative and gives a scientific reason why it works. I have been using Iodine this way for 6 years. I also use it on moles, tags and other skin conitions and it helps to make them small again. I have used it for sore throats too and it works wonderfully. Just use it sparingly as it can be toxic with too much use.