Question

mineral required for proper functioning of thyroid gland

Answer 1

iodine is the mineral required for the proper functioning of thyroid gland

Answer 2

Selenium. Your thyroid gland also contains selenium and, like iodine, it helps you make thyroid hormones. Selenium makes up a component of enzymes, called thyroid hormone deiodinases, which help activate and inactivate thyroid hormones, which regulates your thyroid function.