NOW, L Carnitine, 1000 mg, Fitness Support, Dietary Supplement 100 Tablets CLENZ Skin and Health Care Hypothyroidism is a condition where the thyroid gland does not produce enough thyroid hormone which is crucial to regulate the body's metabolism and growth development. There can be various causes that contribute Role of carnitine in disease Nutrition & Metabolism Springer Nature Link 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 Vitamins to be taken away from thyroid medication