Which trace mineral is essential for thyroid function?

Iodine is essential for thyroid function because it is a crucial component in the synthesis of thyroid hormones, specifically thyroxine (T4) and triiodothyronine (T3). These hormones are critical for regulating metabolism, growth, and development in the body. The thyroid gland takes up iodine from the bloodstream, and without adequate iodine intake, the body cannot produce sufficient amounts of these hormones, which can lead to thyroid disorders such as goiter and hypothyroidism.

While iron, zinc, and copper are important trace minerals with various roles in the body, they are not directly involved in the production of thyroid hormones. Iron plays a vital role in oxygen transport and cellular metabolism, zinc is important for immune function and enzyme activity, and copper is involved in iron metabolism and the maintenance of healthy connective tissues, but none of these minerals substitutes for the role of iodine in thyroid hormone production. Thus, iodine is the essential trace mineral specifically required for thyroid function.