The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation L carnitine reduces hyperthyroidism symptoms My Hypothyroidism Story Diagnosis & Treatment Rachael Attard 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 Thyroid Support Natural Non Hormonal Thyroid Supplement LES Labs L carnitine supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar