What it does: Component of thyroid hormones that help regulate growth, development and metabolic rate
Food sources: Salt, seafood, bread, milk, cheese
Effects of Taking Too Much: Elevated level of thyroid-stimulating hormone (TSH) NOTE: You may be at greater risk of side effects from iodine if you have had iodine deficiency before, or if you have autoimmune thyroid disease or a nodular goiter.
What it does: Part of the protein hemoglobin (carries oxygen throughout body's cells)
Food sources: Artichoke, parsley, spinach, broccoli, green beans, tomato juice, tofu, clams, shrimp, beef liver
Effects of Taking Too Much: Upset stomach; constipation; diarrhea; dark stools; decreased absorption of zinc, calcium and copper NOTE: Blood transfusions and hemochromatosis (a genetic disorder also known as 'iron overload') put you at higher risk for serious problems from taking too much iron.