Desiccated Thyroid Most people suffering from underactive thyroid are prescribed a synthetic hormone replacement therapy, such as levothyroxine. However, for some people, this therapy doesn't seem to work very well or they can't tolerate it. In these cases, doctors will sometimes prescribe desiccated thyroid, which is made from pig thyroids and contains both T4 and T3 hormones. Desiccated thyroid is a natural supplement made from pig thyroids that contain both T4 and T3 hormones.

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