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Iodine is part of the hormones triiodothyronine (T3) and thyroxine (T4) and helps the thyroid gland function normally. The daily requirement for adults is 100 to 150 mcg, but growing children, adolescents, pregnant women and people under emotional stress require more. Iodine deficiency causes goiters and hypothyroidism in people of all ages and in young children may result in cretinism.