When you think of iodine—the chemical element that helps your body produce thyroid hormones and regulate energy—you probably associate it with table salt. That’s because back in the 1920s, researchers ...

Iodine is important for thyroid hormone production. Pregnant people need more iodine than others. Iodine is found in fish, seaweed, dairy, and iodized salt. Iodine deficiency is a nutritional ...

The 13-year-old boy came to the clinic with a rapidly ballooning neck. Doctors were puzzled.Testing ruled out their first suspicion. But further tests pinpointed what they — and the boy — had been ...