Successive thyroid storms treated with L carnitine and low doses of Methimazole The American Journal of Medicine 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 Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Hypothyroid Support & Supplements National Nutrition Articles National Nutrition Articles L carnitine supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar