Lifestyle Interventions to Tackle Cardiovascular Risk in Thyroid Hormone Signaling Disorders 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 Does L Carnitine help manage hyperthyroidism symptoms? Consensus Adding L Carnitine and Selenium to Methimazole in Graves' Disease: A Prospective Randomized Trial on Thyroid Markers and Quality of Life