Table of ContentsView AllTable of ContentsRelevanceFunctionFoodsMedicationsTestingHow to Decrease LevelsRisks
Table of ContentsView All
View All
Table of Contents
Relevance
Function
Foods
Medications
Testing
How to Decrease Levels
Risks
Homocysteineis an amino acid that your body makes when you digest protein. High homocysteine in the blood might indicate a lack of folic acid, vitamin B12, and vitamin B6 or that the body isn’t processing homocysteine effectively.
This article will review what homocysteine levels reveal about your health, homocysteine function, what foods and medications might cause high homocysteine levels, and when to take a homocysteine test.
alvarez / Getty Images
What Homocysteine Levels Reveal About Your Health
Elevated homocysteine levels could indicate a malfunction in this process or a deficiency in specific B vitamins. This condition may also cause harm to the interior lining of arteries and increase the risk ofblood clotformation, leading to heart attack, stroke, or other heart and blood vessel ailments.
Low Homocysteine Levels
Low levels of homocysteine are generally considered to be a good thing, as high levels are associated with an increased risk of cardiovascular disease and other health problems. However, extremely low homocysteine levels are also a concern, as they may indicate an underlying health condition. If your levels are extremely low, discuss this with your healthcare provider.
Normal Homocysteine Levels
Homocysteine levels can differ among genders. A typical; however, a normal level is less than 15 micromoles per liter (mcmol/L).
Elevated Homocysteine Levels
Levels that surpass 15 mcmol/L are calledhyperhomocysteinemia. Elevated homocysteine levels indicate a disturbance in the homocysteine metabolism process.
The levels of high homocysteine include:
Homocysteine Function
Homocysteine is an essential amino acid that plays a crucial role in maintaining cellular homeostasis in our bodies.It is produced during the metabolism of another amino acid called methionine. Homocysteine is normally metabolized and converted into other amino acids or into other compounds that the body can use.
However, when the metabolism of homocysteine is disrupted, high levels of homocysteine can accumulate in the blood, which can be harmful to your health.
What Foods Cause High Homocysteine Levels?
There are several dietary factors that may increase homocysteine levels. But the evidence shows that it’s actually what you don’t eat that can lead to high homocysteine levels.
High homocysteine levels are most commonly seen in people who have a low intake of vitamin B12, vitamin B6, or folic acid. Eating foods rich in these vitamins can help your body break down homocysteine. Without them, homocysteine levels rise.
Research also shows that drinking four or more cups of coffee per day can increase levels of homocysteine.
What Medications Cause High Homocysteine Levels?
Certain drugs can cause an increase in homocysteine levels, which can include:
When to Take a Homocysteine Test
Healthcare providers typically don’t advise routine testing of homocysteine levels to screen for heart disease risk in the general population. Researchers are unsure of how much homocysteine levels impact heart and blood vessel diseases. Also, studies have not shown that reducing homocysteine levels decreases the likelihood of heart attacks or strokes, leading to the recommendation against routine testing.
Your healthcare provider may recommend a homocysteine test if you are malnourished, are an older adult, or have a history of alcohol use or drug addiction. They may also suggest a homocysteine test if you display symptoms indicating a vitamin B12 or folic acid deficiency. These symptoms can range from mild to severe and include:
Your provider may also recommend a test to check forhomocystinuria, an uncommon genetic disease that prevents the body from using an essential amino acid to create vital proteins. It can cause issues with eyesight, blood clots, and brittle bones. Symptoms appear during the first year of life or later in childhood.
Additionally, your provider may recommend a homocysteine test if you have any of the following:
It is essential to consult with your healthcare provider regarding any concerns about your vitamin levels and to discuss the appropriateness of a homocysteine test.
How to Lower Homocysteine Levels
If you have high levels of homocysteine, your healthcare provider may recommend dietary changes to help bring them down. It’s essential to maintain a balanced and healthy diet that provides your body with necessary vitamins and minerals. However, if you’re considering taking vitamin supplements, consult with your healthcare provider first to avoid any potential adverse effects.
Food high infolic acidand other B vitamins appears to help reduce high homocysteine levels. In a randomized trial of 65 participants with high homocysteine levels, daily consumption of folic acid supplements and folic acid–fortified breakfast cereals were found to be effective in reducing homocysteine levels.
Foods that provide folic acid include:
Risks of Unmanaged High Homocysteine Levels
Elevated concentrations of homocysteine can harm the lining of your blood vessels, leading to a heightened susceptibility to blood clots. Consequently, this may elevate the chances of cardiovascular ailments such as heart attack, stroke, and various other disorders of the blood vessels.
Increased levels of homocysteine in the blood can be a risk factor for various health conditions. Here are some key points regarding the role of homocysteine in different population groups:
During pregnancy, increased levels of homocysteine have been associated with an elevated risk of negative pregnancy outcomes such as:
In children, high homocysteine levels are associated with:
In older adults, homocysteine has been linked to:
One 2017 study of 1,101 adults indicated that higher levels of homocysteine are associated with lower muscle strength in women age 50 years or older who are otherwise healthy.
Summary
High homocysteine levels may cause harm to the interior lining of arteries, increase the risk of blood clots, and increase the chances of a heart attack, stroke, or other medical conditions. If you have high homocysteine levels, your healthcare provider may advise altering your diet to help manage the situation.
Consuming a well-balanced diet may help provide the necessary vitamins in appropriate quantities. However, talk to your healthcare provider before taking vitamin supplements. Research has yet to definitively confirm whether lowering homocysteine levels can actually decrease the risk of heart attack or stroke.
12 SourcesVerywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read oureditorial processto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.Medline Plus.Homocysteine test.University of Rochester Medical Center Health Encyclopedia.Homocysteine.Indiana hemophilia and thrombosis center.About hypderhomocysteine.Fowler B.Homocysteine: Overview of biochemistry, molecular biology, and role in disease processes.Semin Vasc Med. 2005;5(02):77-86. DOI: 10.1055/s-2005-872394Diaz-Arrastia R.Homocysteine and neurologic disease.Arch Neurol.2000;57(10):1422–1427. doi:10.1001/archneur.57.10.1422American College of Rheumatology.Methotrexate (Rheumatrex, Trexall, Otrexup, Rasuvo).Cha Y-E, Park R, Jang M, Park Y-I, Yamamoto A, Oh WK, Lee E-J, Park J.6-Azauridine induces autophagy-mediated cell death via a p53- and AMPK-dependent pathway.International Journal of Molecular Sciences. 2021; 22(6):2947. DOI: 10.3390/ijms22062947MedlinePlus.Bile acid sequestrants for cholesterol.Riddell LJ, Chisholm A, Williams S, Mann JI.Dietary strategies for lowering homocysteine concentrations,,. The American Journal of Clinical Nutrition. 2000;71(6):1448-1454. doi: 10.1093/ajcn/71.6.1448Medline Plus.Folic acid.Azzini E, Ruggeri S, Polito A.Homocysteine: Its possible emerging role in at-risk population groups.International Journal of Molecular Sciences. 2020; 21(4):1421. doi: 10.3390/ijms21041421Michelle L Vidoni, PhD, Kelley Pettee Gabriel, PhD, Sheng T Luo, PhD, Eleanor M Simonsick, PhD, R Sue Day, PhD,Relationship between homocysteine and muscle strength decline: The Baltimore longitudinal study of aging. The Journals of Gerontology: Series A, Volume 73, Issue 4, April 2018, Pages 546–551, https://doi.org/10.1093/gerona/glx161
12 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read oureditorial processto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.Medline Plus.Homocysteine test.University of Rochester Medical Center Health Encyclopedia.Homocysteine.Indiana hemophilia and thrombosis center.About hypderhomocysteine.Fowler B.Homocysteine: Overview of biochemistry, molecular biology, and role in disease processes.Semin Vasc Med. 2005;5(02):77-86. DOI: 10.1055/s-2005-872394Diaz-Arrastia R.Homocysteine and neurologic disease.Arch Neurol.2000;57(10):1422–1427. doi:10.1001/archneur.57.10.1422American College of Rheumatology.Methotrexate (Rheumatrex, Trexall, Otrexup, Rasuvo).Cha Y-E, Park R, Jang M, Park Y-I, Yamamoto A, Oh WK, Lee E-J, Park J.6-Azauridine induces autophagy-mediated cell death via a p53- and AMPK-dependent pathway.International Journal of Molecular Sciences. 2021; 22(6):2947. DOI: 10.3390/ijms22062947MedlinePlus.Bile acid sequestrants for cholesterol.Riddell LJ, Chisholm A, Williams S, Mann JI.Dietary strategies for lowering homocysteine concentrations,,. The American Journal of Clinical Nutrition. 2000;71(6):1448-1454. doi: 10.1093/ajcn/71.6.1448Medline Plus.Folic acid.Azzini E, Ruggeri S, Polito A.Homocysteine: Its possible emerging role in at-risk population groups.International Journal of Molecular Sciences. 2020; 21(4):1421. doi: 10.3390/ijms21041421Michelle L Vidoni, PhD, Kelley Pettee Gabriel, PhD, Sheng T Luo, PhD, Eleanor M Simonsick, PhD, R Sue Day, PhD,Relationship between homocysteine and muscle strength decline: The Baltimore longitudinal study of aging. The Journals of Gerontology: Series A, Volume 73, Issue 4, April 2018, Pages 546–551, https://doi.org/10.1093/gerona/glx161
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read oureditorial processto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
Medline Plus.Homocysteine test.University of Rochester Medical Center Health Encyclopedia.Homocysteine.Indiana hemophilia and thrombosis center.About hypderhomocysteine.Fowler B.Homocysteine: Overview of biochemistry, molecular biology, and role in disease processes.Semin Vasc Med. 2005;5(02):77-86. DOI: 10.1055/s-2005-872394Diaz-Arrastia R.Homocysteine and neurologic disease.Arch Neurol.2000;57(10):1422–1427. doi:10.1001/archneur.57.10.1422American College of Rheumatology.Methotrexate (Rheumatrex, Trexall, Otrexup, Rasuvo).Cha Y-E, Park R, Jang M, Park Y-I, Yamamoto A, Oh WK, Lee E-J, Park J.6-Azauridine induces autophagy-mediated cell death via a p53- and AMPK-dependent pathway.International Journal of Molecular Sciences. 2021; 22(6):2947. DOI: 10.3390/ijms22062947MedlinePlus.Bile acid sequestrants for cholesterol.Riddell LJ, Chisholm A, Williams S, Mann JI.Dietary strategies for lowering homocysteine concentrations,,. The American Journal of Clinical Nutrition. 2000;71(6):1448-1454. doi: 10.1093/ajcn/71.6.1448Medline Plus.Folic acid.Azzini E, Ruggeri S, Polito A.Homocysteine: Its possible emerging role in at-risk population groups.International Journal of Molecular Sciences. 2020; 21(4):1421. doi: 10.3390/ijms21041421Michelle L Vidoni, PhD, Kelley Pettee Gabriel, PhD, Sheng T Luo, PhD, Eleanor M Simonsick, PhD, R Sue Day, PhD,Relationship between homocysteine and muscle strength decline: The Baltimore longitudinal study of aging. The Journals of Gerontology: Series A, Volume 73, Issue 4, April 2018, Pages 546–551, https://doi.org/10.1093/gerona/glx161
Medline Plus.Homocysteine test.
University of Rochester Medical Center Health Encyclopedia.Homocysteine.
Indiana hemophilia and thrombosis center.About hypderhomocysteine.
Fowler B.Homocysteine: Overview of biochemistry, molecular biology, and role in disease processes.Semin Vasc Med. 2005;5(02):77-86. DOI: 10.1055/s-2005-872394
Diaz-Arrastia R.Homocysteine and neurologic disease.Arch Neurol.2000;57(10):1422–1427. doi:10.1001/archneur.57.10.1422
American College of Rheumatology.Methotrexate (Rheumatrex, Trexall, Otrexup, Rasuvo).
Cha Y-E, Park R, Jang M, Park Y-I, Yamamoto A, Oh WK, Lee E-J, Park J.6-Azauridine induces autophagy-mediated cell death via a p53- and AMPK-dependent pathway.International Journal of Molecular Sciences. 2021; 22(6):2947. DOI: 10.3390/ijms22062947
MedlinePlus.Bile acid sequestrants for cholesterol.
Riddell LJ, Chisholm A, Williams S, Mann JI.Dietary strategies for lowering homocysteine concentrations,,. The American Journal of Clinical Nutrition. 2000;71(6):1448-1454. doi: 10.1093/ajcn/71.6.1448
Medline Plus.Folic acid.
Azzini E, Ruggeri S, Polito A.Homocysteine: Its possible emerging role in at-risk population groups.International Journal of Molecular Sciences. 2020; 21(4):1421. doi: 10.3390/ijms21041421
Michelle L Vidoni, PhD, Kelley Pettee Gabriel, PhD, Sheng T Luo, PhD, Eleanor M Simonsick, PhD, R Sue Day, PhD,Relationship between homocysteine and muscle strength decline: The Baltimore longitudinal study of aging. The Journals of Gerontology: Series A, Volume 73, Issue 4, April 2018, Pages 546–551, https://doi.org/10.1093/gerona/glx161
Meet Our Medical Expert Board
Share Feedback
Was this page helpful?Thanks for your feedback!What is your feedback?OtherHelpfulReport an ErrorSubmit
Was this page helpful?
Thanks for your feedback!
What is your feedback?OtherHelpfulReport an ErrorSubmit
What is your feedback?
