Over-the-counter thyroid supplements are not supposed to contain any thyroid hormone,” Lee told MedPage Today. “But there’s no truth-in-labeling in these supplements.”
“People who are unsuspecting, or who are already on thyroid medications … can become significantly and severely hyperthyroid,” Lee said.
Lee said thyroid supplements have gained popularity because the symptoms of hypothyroidism — especially fatigue and weight gain — are so common in normal aging. Women looking for a quick fix to those problems may be attracted to supplements that promise to boost thyroid function.