Hypothyroidism is a condition where the thyroid gland does not produce enough thyroid hormone which is crucial to regulate the body's metabolism and growth development. There can be various causes that contribute Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome Acetyl L Carnitine L carnitine reduces hyperthyroidism symptoms Hashimoto's Thyroiditis: The Destructive Thyroid Disease That Slows You Down The Wellness Way Hypothyroidism: Symptoms, Causes and Support Strategies