Reverse T3 is made by the body to tone down energy. It is made by removing a different iodine from T4. It blocks the T3 from signaling the cell to make energy. It allows the body to turn down the energy when it needs to.
Reverse T3 has no action on the cell except it binds to T3 receptors blocking the action of T3.
Low RT3 is typically found when the thyroid gland is unable to keep up T4 production to meet the body
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