DL-Methionine, DL Methionine, DL-Méthionine, L-2-amino-4-(methylthio)butyric acid, L-Methionine, L-Méthionine, Méthionine, Metionina.
Overview InformationMethionine is an amino acid. Amino acids are the building blocks that our bodies use to make proteins. Methionine is found in meat, fish, and dairy products. It plays an important role in the many functions within the body.
Methionine is commonly taken by mouth to treat liver disorders and viral infections along with many other uses. But there is limited scientific research that supports these uses.
How does it work?In acetaminophen poisoning, methionine prevents the breakdown products of acetaminophen from damaging the liver. It may also act as an antioxidant and help to protect damaged tissues.
Uses & Effectiveness
Possibly Effective for
- Acetaminophen (Tylenol) poisoning. Research shows that taking methionine by mouth seems to be effective for treating acetaminophen poisoning. Treatment should begin as quickly as possible but must start within 10 hours of acetaminophen overdose.
Insufficient Evidence for
- Breast Cancer. Eating higher amounts of methionine may be linked to a lower risk of breast cancer.
- Colon cancer. Eating a diet rich in methionine and folate, a type of B vitamin, seems to help reduce the chance of colon cancer. This seems to be especially true for people with a family history of colon cancer and people who drink large amounts of alcohol.
- Neural tube birth defects. Women who eat more methionine during pregnancy seem to have a lower risk of neural tube birth defects.
- Parkinson's disease. Early research suggests that taking L-methionine by mouth for up to 6 months improves symptoms of Parkinson's disease, such as tremor, inability to control movements, and rigidity.
- Hot flashes. Early research suggests that taking methionine doesn't decrease hot flashes in postmenopausal women.
- Herpes simplex virus (HSV).
- Shingles (herpes zoster).
- Human papillomavirus (HPV).
- Pancreatitis (inflamed pancreas).
- Liver function.
- Radiation side effects.
- Drug withdrawal.
- Infections of the kidney, bladder, or urethra (urinary tract infections or UTIs).
- Other conditions.
Side Effects & SafetyMethionine is LIKELY SAFE when taken by mouth in amounts commonly found in foods. It is POSSIBLY SAFE when taken by mouth or given intravenously (by IV) under the supervision of a healthcare professional. In some people, methionine may cause headache, heartburn, nausea, diarrhea, dizziness, or drowsiness.
Don't treat yourself with methionine. It is POSSIBLY UNSAFE to use methionine by mouth or intravenously to self-medicate. Too much methionine can cause brain damage and death. Methionine can increase blood levels of homocysteine, a chemical that may cause heart disease. Methionine might also promote the growth of some tumors.
Special Precautions & Warnings:Children: Methionine is LIKELY SAFE for children when given by mouth in amounts commonly found in foods. It is POSSIBLY SAFE when given by IV, but only under the supervision of a healthcare professional. Methionine is POSSIBLY UNSAFE when given by IV into infants who are also receiving parenteral nutrition (nutrition through the vein).
Pregnancy and breast-feeding: Methionine is LIKELY SAFE when taken by mouth in amounts commonly found in foods. But there is not enough information about the safety of taking methionine in larger doses than those commonly found in foods. Stay on the safe side and avoid use.
Acidosis: Methionine can cause changes in acidity of the blood and should not be used in people with a condition called acidosis.
"Hardening of the arteries" (atherosclerosis): There is some concern that methionine might make atherosclerosis worse. Methionine can increase blood levels of a chemical called homocysteine, especially in people who don't have enough folate, vitamin B12, or vitamin B6 in their bodies, or in people whose bodies have trouble processing homocysteine. Too much homocysteine is linked to an increased risk for diseases of the heart and blood vessels.
Liver disease, including cirrhosis: Methionine might make liver disease worse.
Methylenetetrahydrofolate reductase (MTHFR) deficiency: This is an inherited disorder. It changes the way the body processes homocysteine. People who have this disorder should not take methionine supplements because methionine might cause homocysteine to build up in these people. Too much homocysteine might increase the chance of developing diseases of the heart or blood vessels.
Schizophrenia: Large doses of methionine (e.g., 20 g/day for 5 days) might cause confusion, disorientation, delirium, agitation, listlessness, and other similar symptoms in people with schizophrenia.
We currently have no information for METHIONINE Interactions.
The following doses have been studied in scientific research:
- For acetaminophen (Tylenol) poisoning: 2.5 grams of methionine every 4 hours for 4 doses.
- Bellone J, Farello G, Bartolotta E, et al. Methionine potentiates both basal and GHRH-induced GH secretion in children. Clin Endocrinol (Oxf) 1997;47:61-4. View abstract.
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- Ward, M., McNulty, H., McPartlin, J., Strain, J. J., Weir, D. G., and Scott, J. M. Effect of supplemental methionine on plasma homocysteine concentrations in healthy men: a preliminary study. Int.J.Vitam.Nutr.Res. 2001;71(1):82-86. View abstract.
- Yaghmai, R., Kashani, A. H., Geraghty, M. T., Okoh, J., Pomper, M., Tangerman, A., Wagner, C., Stabler, S. P., Allen, R. H., Mudd, S. H., and Braverman, N. Progressive cerebral edema associated with high methionine levels and betaine therapy in a patient with cystathionine beta-synthase (CBS) deficiency. Am.J.Med.Genet. 2-15-2002;108(1):57-63. View abstract.
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- L-methionine and naltrexone for insomnia. Posit.Health News 1998;(No 17):19. View abstract.
- Larsson, S. C., Giovannucci, E., and Wolk, A. Methionine and vitamin B6 intake and risk of pancreatic cancer: a prospective study of Swedish women and men. Gastroenterology 2007;132(1):113-118. View abstract.
- Lu, S., Hoestje, S. M., Choo, E. M., and Epner, D. E. Methionine restriction induces apoptosis of prostate cancer cells via the c-Jun N-terminal kinase-mediated signaling pathway. Cancer Lett. 5-8-2002;179(1):51-58. View abstract.
- McAuley, D. F., Hanratty, C. G., McGurk, C., Nugent, A. G., and Johnston, G. D. Effect of methionine supplementation on endothelial function, plasma homocysteine, and lipid peroxidation. J.Toxicol.Clin.Toxicol. 1999;37(4):435-440. View abstract.
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- Sasamura, T., Matsuda, A., and Kokuba, Y. Effects of D-methionine-containing solution on tumor cell growth in vitro. Arzneimittelforschung. 1999;49(6):541-543. View abstract.
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- Coelho CND, Klein NW. Methionine and neural tube closure in cultured rat embryos: morphological and biochemical analyses. Teratology 1990;42:437-451.
- Douglas, A. P., Hamlyn, A. N., and James, O. Controlled trial of cysteamine in treatment of acute paracetamol (acetaminophen) poisoning. Lancet 1-17-1976;1(7951):111-115. View abstract.
- Essien FB and Wannaberg SL. Methionine but not folinic acid or vitamin B-12 alters the frequency of neural tube defects in Axd mutant mice. J Nutr 1993;123:27-34.
- Finkelstein, J. D. Homocysteine: a history in progress. Nutr Rev 2000;58(7):193-204. View abstract.
- Hamlyn, A. N., Lesna, M., Record, C. O., Smith, P. A., Watson, A. J., Meredith, T., Volans, G. N., and Crome, P. Methionine and cysteamine in paracetamol (acetaminophen) overdose, prospective controlled trial of early therapy. J.Int.Med.Res. 1981;9(3):226-231. View abstract.
- Hanratty, C. G., McGrath, L. T., McAuley, D. F., Young, I. S., and Johnston, G. D. The effects of oral methionine and homocysteine on endothelial function. Heart 2001;85(3):326-330. View abstract.
- Christensen B, Guttormsen AB, Schneede J, et al. Preoperative methionine loading enhances restoration of the cobalamin-dependent enzyme methionine synthase after nitrous oxide anesthesia. Anesthesiology 1994;80:1046-56. View abstract.
- Cottington EM, LaMantia C, Stabler SP, et al. Adverse event associated with methionine loading test: a case report. Arterioscler Thromb Vasc Biol 2002;22:1046-50.. View abstract.
- De Luca C, Kharaeva Z, Raskovic D, Pastore P, Luci A, Korkina L. Coenzyme Q(10), vitamin E, selenium, and methionine in the treatment of chronic recurrent viral mucocutaneous infections. Nutrition 2012;28(5):509-14. View abstract.
- Epner DE, Morrow S, Wilcox M, Houghton JL. Nutrient intake and nutritional indexes in adults with metastatic cancer on a phase I clinical trial of dietary methionine restriction. Nutr Cancer 2002;42:158-66.. View abstract.
- Epner DE. Can dietary methionine restriction increase the effectiveness of chemotherapy in treatment of advanced cancer? J Am Coll Nutr 2001;20:443S-9S.. View abstract.
- Frosst P, Blom HJ, Milos R, et al. A candidate genetic risk factor for vascular disease: a common mutation in methylenetetrahydrofolate reductase. Nat Genet 1995;10:111-3.. View abstract.
- Fuchs CS, Willett WC, Colditz GA, et al. The influence of folate and multivitamin use on the familial risk of colon cancer in women. Cancer Epidemiol Biomarkers Prev 2002;11:227-34.. View abstract.
- Girelli D, Martinelli N, Pizzolo F, et al. The interaction between MTHFR 677 C-->T genotype and folate status is a determinant of coronary atherosclerosis risk. J Nutr 2003;133:1281-5. View abstract.
- Guttuso T Jr, McDermott MP, Ng P, Kieburtz K. Effect of L-methionine on hot flashes in postmenopausal women: a randomized controlled trial. Menopause 2009;16(5):1004-8.View abstract.
- Hladovec J, Sommerova Z, Pisarikova A. Homocysteinemia and endothelial damage after methionine load. Thromb Res 1997;88:361-4. View abstract.
- Kokko JP. Fluids and electrolytes. In: Goldman L, Bennett JC. Cecil Textbook of Medicine. 21st ed. Philadelphia, PA: W.B. Saunders Co. 2000:59.
- La Vecchia C, Negri E, Franceschi S, Decarli A. Case-control study on influence of methionine, nitrite, and salt on gastric carcinogenesis in northern Italy. Nutr Cancer 1997;27:65-8. View abstract.
- Meakins TS, Persaud C, Jackson AA. Dietary supplementation with L-methionine impairs the utilization of urea-nitrogen and increases 5-L-oxoprolinuria in normal women consuming a low protein diet. J Nutr 1998;128:720-7. View abstract.
- National Research Council (US) Subcommittee on the Tenth Edition of the Recommended Dietary Allowances. Recommended Dietary Allowances: 10th Edition. Washington (DC): National Academies Press (US); 1989. 6, Protein and Amino Acids. https://www.ncbi.nlm.nih.gov/books/NBK234922/. Accessed August 7th, 2017.
- Passaro M, Mainini G, Ambrosio F, Sgambato R, Balbi G. Effect of a food supplement containing L-methionine on urinary tract infections in pregnancy: a prospective, multicenter observational study. J Altern Complement Med 2017;23(6):471-8. View abstract.
- Russman S, Junker E, Lauterburg BH. Remethylation and transsulfuration of methionine in cirrhosis: studies with L-[H3-methyl-1-C]methionine. Hepatology 2002;36:1190-6.. View abstract.
- Su LJ, Arab L. Nutritional status of folate and colon cancer risk: evidence from NHANES I epidemiologic follow-up study. Ann Epidemiol 2001;11:65-72.. View abstract.
- Talukdar R, Murthy HV, Reddy DN. Role of methionine containing antioxidant combination in the management of pain in chronic pancreatitis: a systematic review and meta-analysis. Pancreatology 2015;15(2):136-44. View abstract.
- Vale JA, Meredith TJ, Goulding R. Treatment of acetaminophen poisoning. The use of oral methionine. Arch Intern Med 1981;141:394-6. View abstract.
- Ward M, McNulty H, Pentieva K, et al. Fluctuations in dietary methionine intake do not alter plasma homocysteine concentrations in healthy men. J Nutr 2000;130:2653-7.. View abstract.
- Wu W, Kang S, Zhang D. Association of vitamin B6, vitamin B12 and methionine with risk of breast cancer: a dose-response meta-analysis. Br J Cancer 2013;109(7):1926-44. View abstract.
- Zhou ZY, Wan XY, Cao JW. Dietary methionine intake and risk of incident colorectal cancer: a meta-analysis of 8 prospective studies involving 431,029 participants. PLoS One 2013;8(12):e83588. View abstract.
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