According to Gram Research analysis, people with the MTHFR TT genetic variation have nearly twice the risk of uncontrolled blood pressure when not taking folic acid supplements, even while taking blood pressure medications. A 2026 cohort study of 660 patients with H-type hypertension found that those carrying the TT genetic variant had an odds ratio of 1.89 for uncontrolled blood pressure compared to those with CC or CT variants. This suggests that genetic testing could help identify patients who need additional treatment like folic acid to better manage their blood pressure.
A new study of 660 patients in China found that people with a specific genetic variation called MTHFR TT may have a harder time controlling their blood pressure with medication alone. The research shows that patients with this genetic type were nearly twice as likely to have uncontrolled blood pressure compared to those with other genetic versions, even when taking blood pressure medications as prescribed. The study suggests that doctors might someday use genetic testing to identify patients who need extra help, like folic acid supplements, to better manage their blood pressure. However, more research is needed to confirm whether adding folic acid would actually help these patients.
Key Statistics
A 2026 cohort study of 660 patients with H-type hypertension found that those with the MTHFR TT genetic variation were 1.89 times more likely to have uncontrolled blood pressure compared to patients with CC or CT genetic variants, even while taking blood pressure medications.
Among 660 H-type hypertensive patients not receiving folic acid supplementation, 38.5 percent had uncontrolled blood pressure despite taking guideline-recommended medications, with the TT genotype identified as an independent risk factor across multiple statistical models.
In a 2026 retrospective cohort study of 660 Chinese patients with H-type hypertension, the MTHFR TT genotype remained associated with poor blood pressure control after propensity score matching, with an odds ratio of 1.75 compared to CC and CT carriers combined.
A 2026 study of 660 patients found that Grade 3 hypertension, high psychological stress, high-salt diet, and physical inactivity were consistently identified as independent risk factors for uncontrolled blood pressure alongside the MTHFR TT genetic variation.
The Quick Take
- What they studied: Whether a specific gene variation affects how well blood pressure medications work in people with a condition called H-type hypertension, which is high blood pressure combined with high homocysteine levels in the blood.
- Who participated: 660 patients with H-type hypertension from a hospital in China between 2019 and 2022. All patients were taking blood pressure medications but were not taking folic acid supplements.
- Key finding: Patients with the MTHFR TT genetic variation were 1.89 times more likely to have uncontrolled blood pressure compared to patients with other genetic versions, even though they were taking the same medications.
- What it means for you: If you have high blood pressure that is hard to control with medication, your genes might be part of the reason. In the future, genetic testing might help doctors identify who needs additional treatment like folic acid supplements. Talk to your doctor about your blood pressure control and whether genetic testing or other options might help you.
The Research Details
This was a retrospective cohort study, which means researchers looked back at medical records of patients who had already received treatment. They studied 660 patients with H-type hypertension, a condition common in China where people have both high blood pressure and elevated homocysteine, a substance in the blood that can affect heart health. All patients were taking blood pressure medications according to medical guidelines, but none were taking folic acid supplements. The researchers examined the patients’ MTHFR gene, which controls how the body processes homocysteine. They looked at three different genetic patterns: CC, CT, and TT, based on which versions of the gene each person inherited. The main question was whether the TT genetic variation made it harder for blood pressure medications to work effectively.
Understanding how genes affect medication response is important because it could help doctors predict which patients will struggle to control their blood pressure and need additional treatment. This type of personalized medicine approach could lead to better outcomes for patients whose medications alone aren’t working well. The study focused on patients not taking folic acid, which is important because it shows the pure effect of the genetic variation without the confounding factor of supplementation.
This study has several strengths: it included a large number of patients (660), used multiple statistical methods to confirm findings, and matched patients carefully to reduce bias. The researchers used propensity score matching, a technique that pairs similar patients to make fair comparisons. However, because this was a retrospective study looking at past medical records rather than a prospective study following patients forward in time, it cannot prove that the genetic variation directly causes poor blood pressure control. The study was conducted at a single hospital in one region of China, so results may not apply equally to all populations worldwide.
What the Results Show
Among the 660 patients studied, 61.5 percent had controlled blood pressure while taking their medications, and 38.5 percent had uncontrolled blood pressure. The genetic distribution showed that 28.6 percent had the CC variation, 47 percent had the CT variation, and 24.4 percent had the TT variation. When researchers compared patients with the TT genetic variation to those with CC or CT variations, they found that TT patients were significantly more likely to have uncontrolled blood pressure. The odds ratio was 1.89, meaning TT patients had about 1.9 times higher odds of uncontrolled blood pressure. This finding held true even after the researchers adjusted for other factors that affect blood pressure control. When they used a different statistical approach called LASSO regression, the association remained strong with an odds ratio of 1.83. After carefully matching patients with similar characteristics, the TT group still showed higher odds of uncontrolled blood pressure at 1.75 times higher.
The study identified several other important factors that made blood pressure harder to control. Patients with Grade 3 hypertension, the most severe category, had 1.92 to 2.10 times higher odds of uncontrolled blood pressure. High psychological stress, eating a high-salt diet, and physical inactivity were also consistently linked to worse blood pressure control. These findings suggest that blood pressure control depends on multiple factors beyond genetics, including lifestyle choices and stress levels.
This study adds new information to existing research about the MTHFR gene and blood pressure. Previous research has shown that the MTHFR gene affects how the body handles homocysteine, and high homocysteine is linked to high blood pressure. However, this is one of the first studies to specifically examine how the MTHFR TT genetic variation affects blood pressure control in patients not taking folic acid supplements. The findings suggest that genetic testing might help identify patients who need additional treatment, which aligns with current medical guidelines recommending folic acid for H-type hypertension patients.
This study has important limitations to consider. Because it looked at past medical records rather than following patients forward in time, it cannot prove that the genetic variation causes poor blood pressure control. The study was conducted at a single hospital in Xinjiang, China, so the results may not apply equally to people from other regions or ethnic backgrounds. The study did not include information about whether patients actually took their medications as prescribed, which could affect blood pressure control. Additionally, the study did not test whether giving folic acid supplements to TT patients would actually improve their blood pressure control, so we cannot yet recommend this as a treatment based on this research alone.
The Bottom Line
If you have high blood pressure that is difficult to control with medication, discuss with your doctor whether genetic testing for the MTHFR variation might be helpful. If you have the TT genetic variation and are not already taking folic acid, ask your doctor whether a folic acid supplement might help improve your blood pressure control. Additionally, focus on lifestyle factors that the research shows help control blood pressure: managing stress, reducing salt intake, and staying physically active. These recommendations are based on moderate evidence and should be discussed with your healthcare provider.
This research is most relevant for people with H-type hypertension, a condition combining high blood pressure with elevated homocysteine levels. It is particularly important for people whose blood pressure remains high despite taking medications as prescribed. People with a family history of difficult-to-control high blood pressure might also benefit from discussing genetic testing with their doctor. This research is less immediately relevant for people with normal blood pressure or those whose blood pressure is well-controlled with current medications.
If you and your doctor decide to try folic acid supplementation based on genetic testing, you should expect to see changes in blood pressure over weeks to months, not days. Blood pressure typically takes 4 to 12 weeks to respond to medication changes. Lifestyle changes like reducing salt intake and increasing physical activity may show benefits within 2 to 4 weeks for some people, though individual responses vary.
Frequently Asked Questions
Does the MTHFR TT gene mutation cause high blood pressure?
The MTHFR TT genetic variation does not directly cause high blood pressure, but research shows it makes blood pressure harder to control with medication alone. People with this genetic type may need additional treatment like folic acid supplements to achieve better blood pressure control.
Should I get genetic testing for MTHFR if my blood pressure is hard to control?
If your blood pressure remains high despite taking medications as prescribed, discussing genetic testing with your doctor may be worthwhile. A 2026 study found that TT carriers had 1.89 times higher odds of uncontrolled blood pressure, suggesting genetic testing could identify who needs additional treatment options.
Can folic acid supplements help lower blood pressure if I have the MTHFR TT gene?
Current medical guidelines recommend folic acid for H-type hypertension patients, but this study did not test whether it actually helps TT carriers. More research is needed to confirm whether folic acid supplementation improves blood pressure control in people with the TT genetic variation.
What percentage of people have the MTHFR TT genetic variation?
In this study of 660 Chinese patients, 24.4 percent had the MTHFR TT genetic variation. The frequency of this genetic type varies among different populations and ethnic groups worldwide.
What lifestyle changes help control blood pressure besides medication?
Research shows that reducing salt intake, managing psychological stress, and staying physically active significantly improve blood pressure control. The study found that high-salt diet, high stress, and physical inactivity were independent risk factors for uncontrolled blood pressure across all patient groups.
Want to Apply This Research?
- Track your daily blood pressure readings at the same time each day, recording both systolic (top number) and diastolic (bottom number) values. Note any changes after starting folic acid supplements or making lifestyle modifications. Compare your readings week to week to see if they are trending lower.
- If you have the MTHFR TT genetic variation, use the app to set reminders for taking folic acid supplements if your doctor recommends them. Additionally, set daily reminders to reduce salt intake by avoiding processed foods, limit stress through guided relaxation exercises available in many health apps, and track physical activity with a goal of 150 minutes of moderate exercise per week.
- Use the app to maintain a long-term blood pressure log with weekly averages rather than focusing on individual readings. Set a goal based on your doctor’s recommendations, typically below 140/90 mmHg for most adults. Track adherence to folic acid supplements and lifestyle changes alongside blood pressure readings to identify which factors correlate with better control.
This article summarizes research findings and should not be interpreted as medical advice. The study was conducted in a specific population in China and may not apply equally to all groups. If you have high blood pressure or are concerned about your blood pressure control, consult with your healthcare provider before making any changes to your medications or starting supplements. Genetic testing and folic acid supplementation should only be pursued under medical supervision. This research is preliminary and requires confirmation through additional studies before clinical recommendations can be made.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.