Iodotyrosine (monoiodothyronine, MIT), is an intermediate product in the synthesis of triiodothyronine (T3) which is formed by iodination of thyroglobulin. In combination with diiodothyronine forms the most active thyroid hormone: triiodothyronine. Its task is to enhance metabolism and protein anabolism, participation in lipolysis. .It is an ingredient in weight loss supplements.