Positioned at the bottom of the larynx at the front of the neck, the thyroid gland is a butterfly shaped gland that produces thyroid hormones. Between 1 and 5 percent of the population is affected by thyroid disorders, usually resulting in either too much or too little thyroid hormones being produced. The amino acid L-tyrosine has been promoted as a supplement that may be helpful in managing some thyroid disorders.
Thyroid Hormones
Created in the thyroid gland in response to stimulus from the pituitary gland and the hypothalmus, thyroid hormones are comprised of peptides that contain iodine. Tetraiodothyronine, also called thyroxine or T4, and triiodothyronine, or T3, are the most vital thyroid hormones. These hormones have a direct effect on the body's metabolic rate, as well as affecting development and growth.
Thyroid Disorders
There are two categories of thyroid disorders: those associated with a problem in hormone production and those resulting from an enlargement of the thyroid gland. A malfunction in hormone production can result in excess hormone being present in the body, a state known as hyperthyroidism, or too little hormone, a condition called hypothyroidism.
Hyperthyroidism
Hyperthyroidism affects about 1 percent of the U.S. population, according to the American Association of Clinical Endocrinologists. Fast heart rate, muscle weakness, loose and frequent bowel movements, heat sensitivity, hair and weight loss, protrusion of the eyes and trembling hands are some of the symptoms of hyperthyroidism.
Tyrosine
Tyrosine is an amino acid produced in the body and used in making neurotransmitters, which facilitate nerve communications. It is also needed by organs that make and regulate hormones. These include the adrenal, thyroid and pituitary glands. The thyroid gland combines iodine and tyrosine to produce thyroxine, or T4, making tyrosine an essential component of thyroid function.
Tyrosine and Thyroid Disease
In its role as one of the necessary elements of thyroid hormone production, 500 mg of L-tyrosine two to three times daily has been suggested as possible treatment for hypothyroidism, or reduced hormone production. It is strongly advised that if you are suffering from hyperthyroidism, you avoid tyrosine supplements. The extra tyrosine may cause an increase in thyroid hormone production, exacerbating the problem of hormone overproduction manifested in the disease.
Warning
Tyrosine supplements are not recommended if you have hyperthyroidism. You are encouraged to seek medical advice before adding supplements to your diet.
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