Frontiers Thyroid hormones and minerals in immunocorrection of disorders in autoimmune thyroid diseases Mitochondrial control of fuel switching via carnitine biosynthesis Science L carnitine reduces hyperthyroidism symptoms Carnitine Molecule of the Month September 2003 The most common cause of hypothyroidism worldwide is insufficient intake of iodine, a mineral found in iodized salt and some foods (such as seafood and dairy) that is needed for production of L carnitine, Acetyl L carnitine, and Thyroid Health Save My Thyroid Project