Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome 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 Goitrogens Affect Hashimoto's Dr. Izabella Wentz L Carnitine Supplementation in the Diabetic Heart ABC Cardiol Efficacy of L carnitine supplementation for improving lean body mass and physical function in patients on hemodialysis: a randomized controlled trial European Journal of Clinical Nutrition Carnitine: the claims and why it may not work