L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians L carnitine reduces hyperthyroidism symptoms Thyroid medication hi res stock photography and images Alamy Successive thyroid storms treated with L carnitine and low doses of Methimazole The American Journal of Medicine 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