Thyroid extract comes from tissue in the animal thyroid gland. Some thyroid extract supplements contain dried and/or ground raw tissue from animal thyroid glands. Other thyroid extract supplements contain extract from animal thyroid glands. There are two major hormones produced by the thyroid gland: triiodothyronine (T3) and thyroxine (T4). Thyroid extract contains both hormones.

People take thyroid extract by mouth for a heart rhythm disorder called Adams-Stokes syndrome, stunted mental and physical growth (cretinism), enlarged thyroid gland (goiter), a condition in which the immune system attacks the thyroid gland (Hashimoto's disease), low thyroidhormone production (hypothyroidism), infertility, severely low thyroid hormone production (myxedema), and thyroid cancer.

How does it work ?

Thyroid extract contains the thyroid hormones triiodothyronine (T3) and thyroxine (T4). These hormones are involved in many different processes in the body. Both T3 and T4 are involved in the control of growth and development, particularly in the development of the bones and brains of a developing fetus.

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