L Carnitine in Drosophila: A Review 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 What is the recommended adjustment for Synthroid (levothyroxine) dosage in a pregnant woman with pre existing hypothyroidism? Thyroid medication use as an assisted bodybuilder should be approached with caution and based strictly on individual neednot just because it's what you do during prep. Too often, both competitors and non competitors L Carnitine and Levothyroxine: A Critical Interaction Warning Anabolic Planner