Hypothyroidism: Symptoms, Causes and Support Strategies L carnitine supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar Thyroid gland and Hyperthyroidism 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 Thyroid Health Affects The Immune System Renewed Vitality