French chemist Bernard Courtois discovered iodine in 1811, and in 1896 Eugen Baumann documented it as the central ingredient in the thyroid gland. He did this by boiling the thyroid glands of a thousand sheep, and named the precipitate, a combination of the thyroid hormones, 'iodothyrin'. David Marine in 1907 proved that iodine is necessary for thyroid function.
french chemist bernard courtois discovered iodine in 1811 and in 1896 eugen baumann documented it as the central ingredient in the thyroid gland he did this by boiling the thyroid glands of a thousand sheep and named the precipitate a combination of the thyroid hormones 'iodothyrin' david marine in 1907 proved that iodine is necessary for thyroid function