Question: what is the difference between armour thyroid and levothyroxine?
Answer: Armour is animal-derived and purified in a laboratory. More specifically, Armour is known as an NDT medication, short for Natural Desiccated Thyroid, and it is porcine-derived from the thyroid glands of pigs. 3. Synthroid contains T4 (thyroxine) only, whereas Armour contains both T4 and T3 (tri-iodothyronine).