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. The most likely cause is Low Cortisol Explanation: 90% of all hypothyroid conditions are Hashimoto's. This is an autoimmune (your body attacks itself) condition. With this condition, the thyroid has antibodies that 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 L carnitine extenuates endocrine disruption, inflammatory burst and oxidative stress in carbendazim challenged male rats via upregulation of testicular StAR and FABP9, and downregulation of P38 MAPK pathways ScienceDirect 5 Ways to Get Rid of Thyroid Fatigue