Which mineral is involved in the formation of thyroid hormones?

Iodine is essential for the formation of thyroid hormones, particularly thyroxine (T4) and triiodothyronine (T3). The thyroid gland absorbs iodine from the bloodstream and uses it in the synthesis of these hormones, which play a crucial role in regulating metabolism, growth, and development. Without sufficient iodine, the body cannot produce adequate amounts of these hormones, leading to conditions such as goiter or hypothyroidism.

While zinc, selenium, and iron are important minerals for various biological functions, they do not directly participate in the synthesis of thyroid hormones like iodine does. Zinc and selenium are involved in other bodily processes, such as immune function and antioxidant defense, while iron is primarily known for its role in oxygen transport in the blood through hemoglobin. However, it is iodine that is specifically required for the production of thyroid hormones, making it the correct choice in this context.