Dr. David Brownstein loves to write books about various medical issues. Iodine Deficiency is one of them. 50% of the population is iodine deficient. He states that breast, ovary, and prostate cancer rates are increased because iodine deficiency. The best way to supplement iodine deficiency is to add a few drops of Lugol’s solution. It is 50% potassium iodide and 50% iodine. The body needs both. It’s dirt cheap and if you’re slowly developing hypothyroidism, it helps that, too.