Hi all, just a question to ask if anyone who is on Levothyroxine for underactive thyroid takes L Carnitine shots? L Carnitine Benefits Patients with Hypothyroidism Natural Health Research Surprising Interactions with Levothyroxine (Synthroid) and Herbal Supplements Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health 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