Generally healthy, iodine-replete males and non-pregnant, non-lactating females, who are between 18 and 45 years old, whose body weight is less than 80 kg and BMI between 19-27.5 kg/m2, who regularly consume iodized salt, who have signed the informed consent, and who have good knowledge of the English language. They will serve as an iodine-sufficient population with normal iodine metabolism.