NP Thyroid® is a medication produced from porcine thyroid glands. It is a desiccated thyroid extract containing a combination of levothyroxine (T4) and liothyronine (T3). Each 60 mg of thyroid extract contains approximately 38 mcg of T4 and 9 mcg of T3, though some variability in T4 and T3 content may occur. The inconsistency in hormone concentrations within thyroid extracts contributed to the development of synthetic T4 formulations.
