Surprising Interactions with Levothyroxine (Synthroid) and Herbal Supplements There are 3 main types of thyroid medications available T4 T3 (usually combined with T4) NDT desiccated thyroid (a combination of T4 + T3) Most are widely available Rx Item Levothyroxine 100% Powder(Non Sterile Pharmaceutical Grade ) 1Gm B Successive thyroid storms treated with L carnitine and low doses of Methimazole The American Journal of Medicine L Carnitine Benefits Patients with Hypothyroidism Natural Health Research De novo L carnitine biosynthesis. (A) Carnitine is synthesised from the Download Scientific Diagram