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Tyrosine is a nonessential amino acid that is naturally synthesized in your body but can also be obtained in many high-protein foods such as soy and dairy products, fish, nuts, seeds and avocados. Tyrosine is important for the formation of brain neurotransmitters and hormones, which help regulate everything from metabolism and cardiovascular function to emotions and memory. Tyrosine intolerance occurs when your body acquires too much of this substance, causing an overdose. This can occur when you eat a very high-protein, high-fat diet with very low carbohydrates.
If you are experiencing serious medical symptoms, seek emergency treatment immediately.
When your body contains too much tyrosine, it may cause adverse effects on your thyroid gland, which produces hormones that regulate your metabolism. Hyperthyroidism is a condition in which your thyroid gland overproduces thyroid hormones, and is sometimes caused by excessive amounts of tyrosine. Symptoms of hyperthyroidism include:
- difficulty concentrating
- chronic fatigue
- frequent bowel movements
- swelling around your neck
- heat intolerance
- increased appetite
- excessive sweating
- irregular menstruation in women
- unexplained weight loss
Herbal Remedies for Dermatitis Stasis
Allergic reactions to tyrosine are rare because your body can synthesize it naturally, making it a nonessential amino acid. But allergic reactions do occur. If you experience any of these symptoms, consult your physician to take an allergy test to determine if tyrosine or some other substance is causing your allergies.
Some individuals may have trouble absorbing dietary tyrosine, but may not experience the effects of a tyrosine deficiency because it is naturally occurring in your body. Dietary tyrosine is absorbed by your small intestine, where it is then transferred to your bloodstream and throughout your body so it can exert its effects on various bodily tissues. If your small intestine is not able to absorb dietary tyrosine due to an illness or infection, you may experience nausea, persistent stomach cramps and diarrhea.
- Some individuals may have trouble absorbing dietary tyrosine, but may not experience the effects of a tyrosine deficiency because it is naturally occurring in your body.
- If your small intestine is not able to absorb dietary tyrosine due to an illness or infection, you may experience nausea, persistent stomach cramps and diarrhea.
Tyrosine and Neurotransmitters
Use of L-Glycine by the Human Body
If your body has acquired too much tyrosine, it may initially increase, then substantially decrease, the production of these two compounds. This may lead to changes in your mood such as increases in anxiety and depression and disruption of memory and cognition, as well as physical effects including body tremors, numbness in your hands and feet and muscle spasms. It may even increase your risk of seizures. If you take antidepressants or mood elevators, you may be cautioned not to take excess amounts of tyrosine as it can make your symptoms worse. If you suffer from anxiety or depression, consult your physician to assess whether your tyrosine intake will adversely affect those conditions.
- If your body has acquired too much tyrosine, it may initially increase, then substantially decrease, the production of these two compounds.
- If you suffer from anxiety or depression, consult your physician to assess whether your tyrosine intake will adversely affect those conditions.
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Use of L-Glycine by the Human Body
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- "Essentials of Sports Nutrition and Supplements"; Jose Antonio, Douglass Kalman, Jeffrey R. Stout, and Mike Greenwood; 2008
- "Nutrition for Health, Fitness, and Sport"; Melvin H. Williams; 2002
- Gardner CD, Hartle JC, Garrett RD, Offringa LC, Wasserman AS. Maximizing the intersection of human health and the health of the environment with regard to the amount and type of protein produced and consumed in the United States. Nutr Rev. 2019;77(4):197–215. doi:10.1093/nutrit/nuy073
- Webster D, Wildgoose J. Tyrosine supplementation for phenylketonuria. Cochrane Database Syst Rev. 2013;(6):CD001507.
- Campbell B, Wilborn C, La Bounty P, et al. International Society of Sports Nutrition position stand: energy drinks. J Int Soc Sports Nutr. 2013;10(1):1. Published 2013 Jan 3. doi:10.1186/1550-2783-10-1
- Mahoney CR, Castellani J, Kramer FM, Young A, Lieberman HR. Tyrosine supplementation mitigates working memory decrements during cold exposure. Physiol Behav. 2007;92(4):575-82. doi:10.1016/j.physbeh.2007.05.003
- Avraham Y, Hao S, Mendelson S, Berry EM. Tyrosine improves appetite, cognition, and exercise tolerance in activity anorexia. Med Sci Sports Exerc. 2001;33(12):2104-10. PMID: 11740306
- Martinez N, Campbell B, Franek M, Buchanan L, Colquhoun R. The effect of acute pre-workout supplementation on power and strength performance. J Int Soc Sports Nutr. 2016;13:29. Published 2016 Jul 16. doi:10.1186/s12970-016-0138-7
- DeGroot LJ. Diagnosis and Treatment of Graves' Disease. Endotext [Internet]. . Published November 2, 2016.
- National Center for Complementary and Integrative Health (NCCIH). Using Dietary Supplements Wisely. National Center for Complementary and Integrative Health. Published January 15, 2019.
- Frequently Asked Questions (FAQ). NIH Office of Dietary Supplements. Published July 1, 2013.
- Belza A, Frandsen E, Kondrup J. Body fat loss achieved by stimulation of thermogenesis by a combination of bioactive food ingredients: a placebo-controlled, double-blind 8-week intervention in obese subjects. Int J Obes (Lond). 2007;31(1):121-30. doi: 10.1038/sj.ijo.0803351
- Hoffman JR, Ratamess NA, Gonzalez A, et al. The effects of acute and prolonged CRAM supplementation on reaction time and subjective measures of focus and alertness in healthy college students. J Int Soc Sports Nutr. 2010;7:39. doi: 10.1186/1550-2783-7-39
- Tumilty L, Davison G, Beckmann M, Thatcher R. Oral tyrosine supplementation improves exercise capacity in the heat. Eur J Appl Physiol. 2011;111(12):2941-50. doi: 10.1007/s00421-011-1921-4
- University of Michigan. L-Tyrosine for Weight Control. https://www.uofmhealth.org/health-library/hn-3927007
- Watson P, Enever S, Page A, et al. Tyrosine supplementation does not influence the capacity to perform prolonged exercise in a warm environment. Int J Sport Nutr Exerc Metab. 2012;22(5):363-73.
Joe King began writing fitness and nutrition articles in 2001 for the "Journal of Hyperplasia Research" and Champion Nutrition. As a personal trainer, he has been helping clients reach their fitness goals for more than a decade. King holds a Bachelor of Science in kinesiology from California State University, Hayward, and a Master of Science in exercise physiology from California State University, East Bay.