How likely is iodine to cause cancer?
Some human studies have found an increased risk of thyroid cancer in certain populations, particularly populations with iodine deficient diets receiving iodine supplements. Other human studies have not found an association between exposure to high levels of iodine and cancer risk. Exposure to high levels of radioactive iodine may also increase the risk of thyroid cancer. However, the evidence is inconclusive for exposures in the United States.
