Role of carnitine in disease Nutrition & Metabolism Springer Nature Link L carnitine reduces hyperthyroidism symptoms 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 Carnitine and Thyroid Disease page 1 Life Extension L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians Targeting Skeletal Muscle Dysfunction With L Carnitine for the Treatment of Patients With Chronic Obstructive Pulmonary Disease In Vivo