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Who makes Nature-Throid and where is it manufactured?

Medically reviewed by Carmen Fookes, BPharm. Last updated on Sep 10, 2021.

Official answer


Nature-Throid is made by RLC Labs located at 1850 E Riverview Dr, Phoenix, Arizona. RLC labs manufactures, labels and distributes porcine-derived thyroid drug tablets for human use under the brand names of Nature-Throid and WP Thyroid.

Nature-Throid is a natural desiccated thyroid replacement therapy obtained from pig thyroid glands that is a prescription medicine. First released in the 1930s, it was one of the first available medications for hypothyroidism. It contains T4 & T3 replacement hormones and is available in 11 strengths ranging from ¼ grain (16.25 mg) to 3 grain (195 mg). It also contains naturally occurring thyroid cofactors T1, T2, calcitonin, and iodine (in trace amounts). Nature-Throid is not FDA approved.

  • Nature-Throid (thyroid desiccated) Updated 05/2021.
  • Nature-Throid

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