Does L Carnitine help manage hyperthyroidism symptoms? Consensus Adding L Carnitine and Selenium to Methimazole in Graves' Disease: A Prospective Randomized Trial on Thyroid Markers and Quality of Life Hormones.gr 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 Veg Capsules NOW Foods Amino Acids