Hypothyroidism is a metabolic disorder caused by a defective thyroid gland. Your thyroid is a butterfly-shaped endocrine gland that is located at the base of your throat, right above your collarbone. Your thyroid gland is responsible for releasing certain hormones and chemicals that control the rate of your metabolism. There are some studies that suggest that L-carnitine, a dietary supplement, may have effects on the function of your thyroid. Be sure to have a discussion with your physician if you are thinking about taking L-carnitine for your thyroid.
Thyroid Function
Your thyroid gland releases metabolic stimulating hormones following stimulation by thyroid stimulating hormone, or TSH, that is released from the pituitary gland in your brain. The primary hormones released by your thyroid are called T3 and T4. These two hormones signal the rate at which your tissues and organs burn through glucose, or energy. According to the National Endocrine and Metabolic Disease Information Service, thyroid hormones can affect many functional processes including development, sexual health, nervous system functioning, muscle strength and body temperature.
Thyroid Disorders
A chronically underactive thyroid can be diagnosed as hypothyroidism. Conversely, an overactive thyroid is called hyperthyroidism. Since your thyroid gland is responsible for controlling metabolic rates, a reduction or increase in thyroid activity results in changes in your metabolic rate. According to MedlinePlus, hypothyroidism may cause unintentional weight gain, depression, fatigue or exhaustion, slowed speech, hoarseness, systemic weakness, and joint and muscle pain. Hyperthyroidism may cause symptoms related to nervousness, insomnia, weight loss, tremors, mood swings and diarrhea. According to Mayoclinic.com, treatment options for hypothyroidism are limited and primarily include thyroid hormone replacement medications like Levithroid and Synthroid. Hyperthyroidism is often treated with medications like beta blockers, anti-thyroid drugs and radioiodine therapy.
L-Carnitine
L-carnitine is absorbed into your system from dietary sources and is naturally synthesized by your body from the amino acids methionine and lysine. According to the University of Maryland Medical Center, L-carnitine is a molecule that is important for converting fat into energy in several vital organs and tissues including the brain, liver, heart and muscles. The Linus Pauling Institute states that L-carnitine supplementation may be beneficial to slow age-related cognitive decline and for L-carnitine-related deficiencies.
L-Carnitine and Thyroid Misconceptions
Due to the similarity in terms, hypothyroidism and hyperthyroidism often become confused with each other. There is no scientific evidence to suggest that L-carnitine can be used as an alternative treatment for hypothyroidism. However, according the University of Maryland Medical Center, some research studies have indicated a benefit of L-carnitine supplementation for hyperthyroidism. Regardless of the thyroid condition you are interested in treating, always consult with your primary care provider to limit the potential risks of self-medication.
References
- National Endocrine and Metabolic Disease Information Service; Thyroid Function Tests; January 2010
- MedLinePlus; Hypothyroidism; April 2010
- MayoClinic.com; Hypothyroidism (underactive thyroid); June 2010
- National Endocrine and Metabolic Disease Information Service; Hyperthyroidism; April 2008
- University of Maryland Medical Center; Carnitine
- Linus Pauling Institute at Oregon State University; L-Carnitine; April 2007
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