Hyperthyroidism: Symptoms, Causes and Support Strategies If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy. Does L Carnitine help manage hyperthyroidism symptoms? Consensus Thyroid Supplement with L Carnitine for Cats Only Natural Pet Targeting Skeletal Muscle Dysfunction With L Carnitine for the Treatment of Patients With Chronic Obstructive Pulmonary Disease In Vivo Adding L Carnitine and Selenium to Methimazole in Graves' Disease: A Prospective Randomized Trial on Thyroid Markers and Quality of Life