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 is Underrated. New Meta Review Reminds Us Why. Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications Adding L Carnitine and Selenium to Methimazole in Graves' Disease: A Prospective Randomized Trial on Thyroid Markers and Quality of Life Hyperthyroidism and Functional Medicine Guide Amy Myers MD AMMD Graves' Disease and the Manifestations of Thyrotoxicosis Endotext NCBI Bookshelf