The Best Thyroid Supplements For Weight Loss The supplement secret for hyperthyroidism? When dealing with hyperthyroidism or Graves' disease, L carnitine can be a total game changer. It helps block the entry of thyroid hormone into the cell nuclei, potentially Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome American ME and CFS Society Does L Carnitine help manage hyperthyroidism symptoms? Consensus Is it safe to take L carnitine with levothyroxine (thyroid medication)? L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe