- Thyroid refers to a group of hormones produced in the body.
- The two main thyroid hormones are thyroxine or T4, and triiodothyronine or T3.
- T4 is produced by the thyroid gland. It is the inactive thyroid hormone in the body.
- T3 is produced by the thyroid gland and in the brain and liver via the conversion of T4. It is the active thyroid hormone in the body.
- Thyroid hormones are involved in regulating the body's metabolism, increasing energy, and regulating the menstrual cycle.
- This metabolic hormone decreases steadily with age.
- Lack of thyroid hormone results in cold intolerance, fatigue, lassitude, weight gain, increased cholesterol, thin and dry skin, hair loss, thin and brittle
- Replenishment results in reversal of these symptoms plus increased energy and metabolism.