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. How Should I Use Thyroid Supplements? L Carnitine: Does it help with weight loss? Hypothyroidism: Symptoms, Causes and Support Strategies How Does Carnitine Support Hashimoto's? Dr. Izabella Wentz Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome