A hormone produced by the thyroid gland stimulates progesterone production in the ovaries.

Your thyroid gland is responsible for producing hormones that regulate your metabolic rate. They help to maintain a healthy body weight, energy levels and a healthy mood. The two main hormones produced by the thyroid are T4 and T3. T3 is the active hormone and research shows it is necessary for the production of progesterone.

The two main female hormones are estrogen and progesterone. Estrogen dominates in the first half of the menstrual cycle and progesterone is the main hormone produced in the second half. Many women do not produce enough progesterone, and this can have terrible health consequences. A lack of progesterone is linked to excessively heavy menstrual bleeding, painful menstrual cramps, premenstrual mood changes, breast tenderness and an increased risk of uterine fibroids and endometriosis.

Progesterone is also critically important for fertility. It's impossible to become pregnant or stay pregnant if you do not produce enough progesterone.

Interestingly, research also shows that thyroid antibodies inhibit progesterone production. Thyroid antibodies are produced by women with the autoimmune disease Hashimoto's thyroiditis, which causes the thyroid gland to become under active. We certainly see among patients that women with Hashimoto's often have menstrual problems and fertility problems.

For information on how to overcome these conditions see our books Your Thyroid Problems Solved and Healing Autoimmune Disease.