The most likely cause is Low Cortisol, Explanation:, 90% of all hypothyroid conditions are Hashimotos. This is an autoimmune (your body attacks itself) condition. With this condition, the thyroid has Carnitine Blend Rootcology 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 Deficiencies Affecting Patient's Health with Hashimoto's Thyroiditis The Benefits of Amino Acids for Hashimoto's Dr. Izabella Wentz, PharmD L Carnitine Benefits for Chronic Fatigue Syndrome