L Carnitine CAM Cancer 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 L Carnitine Graves' Disease and the Manifestations of Thyrotoxicosis Endotext NCBI Bookshelf AcetylLcarnitine suppresses thyroid hormoneinduced and spontaneous anuran tadpole tail shortening Hanada 2013 Hereditas Wiley Online Library Frontiers The protective role of nutritional antioxidants against oxidative stress in thyroid disorders