Thyroxine

The Thyroxine hormone was isolated from thyroglobulin. This iodine-containing amino acid is responsible for the overall rate of metabolism in the body, so that the more active the thyroid gland, the faster the human metabolic rate.
 Edward Calvin Kendall United States 1915 Thyroxine

The Thyroxine hormone was isolated from thyroglobulin. This iodine-containing amino acid is responsible for the overall rate of metabolism in the body, so that the more active the thyroid gland, the faster the human metabolic rate.