Does magnesium lower blood pressure?

Key Takeaways

• Magnesium plays an important role in heart, muscle, and nerve function and may help support healthy blood pressure.
• Studies suggest magnesium supplements may produce modest improvements in blood pressure readings, particularly in people with magnesium deficiency or hypertension.
• Magnesium works by helping relax artery walls, improving blood vessel function, and supporting a healthy heart rate.
• Eating magnesium-rich foods, including green leafy vegetables, nuts, seeds, and legumes, is the best way to increase magnesium intakes for most people.
• Magnesium supplements should be used under the guidance of a healthcare provider, especially if you have kidney disease or take blood pressure medications.

High blood pressure (hypertension) affects nearly half of U.S. adults and is one of the leading risk factors for heart disease, stroke, and kidney disease. Because hypertension often develops without noticeable symptoms, regularly measuring your blood pressure is one of the best ways to detect it early and reduce your risk of serious health complications.

Along with medications, lifestyle changes and nutrition play a major role in managing hypertension. Magnesium has gained attention as a mineral that may help support healthy blood pressure, but how effective is it? Here’s what current research says.

Can Magnesium Help Lower Blood Pressure?

Magnesium is an essential mineral involved in more than 300 biochemical reactions throughout the body. It helps regulate muscle contractions, nerve function, blood sugar, and the cardiovascular system.

Several clinical studies and meta-analyses suggest that increasing magnesium intakes may lead to modest improvements in blood pressure readings, particularly in people who have hypertension or magnesium deficiency.

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Research has found:

• A large meta-analysis reported that oral magnesium supplements reduced systolic blood pressure by up to 5.6 mmHg and diastolic blood pressure by up to 2.8 mmHg in some participants.
• Another clinical trial found that taking 368 mg of magnesium daily for three months lowered systolic blood pressure by approximately 2 mmHg and diastolic blood pressure by nearly 1.8 mmHg.
• The U.S. Food and Drug Administration (FDA) allows qualified health claims linking magnesium intake with a reduced risk of hypertension while noting that the available scientific evidence remains limited and is not conclusive.

Although magnesium is not considered a standalone treatment for hypertension, it may complement a healthy lifestyle and prescribed medications for some individuals.

How Does Magnesium Affect Blood Pressure?

Your heart continuously pumps blood through arteries and blood vessels to deliver oxygen and nutrients throughout the body. Blood pressure is determined by how forcefully your heart pumps blood and how much resistance exists within your artery walls.

Magnesium supports cardiovascular health through several mechanisms.

It Helps Relax Blood Vessels

Magnesium acts as a natural calcium blocker. While calcium causes blood vessel muscles to contract, magnesium helps those muscles relax. This relaxation reduces tension within artery walls and may contribute to healthier blood pressure.

It Increases Nitric Oxide Production

Magnesium helps stimulate nitric oxide production, which widens blood vessels and improves circulation. Better blood flow may reduce the workload on the heart and help maintain healthy blood pressure.

It Supports Normal Heart Function

Magnesium plays an important role in regulating electrical signals that control how your heart beats. Maintaining adequate magnesium levels supports a normal heart rate and helps the heart function efficiently.

It May Reduce Blood Vessel Damage

Emerging research suggests magnesium may help protect artery walls from inflammation and oxidative stress. This could improve long-term cardiovascular health while reducing some of the damage associated with chronic hypertension.

It May Enhance Blood Pressure Medications

Some research indicates magnesium may improve the effectiveness of certain antihypertensive medications, including calcium channel blockers and beta-blockers. However, patients should never change their medication regimen without consulting their healthcare provider.

Who May Benefit Most From Magnesium?

Not everyone experiences the same response to magnesium supplementation. Research suggests the greatest benefit may occur in people who:

• Have high blood pressure
• Have a magnesium deficiency
• Consume low-magnesium diets
• Eat excessive amounts of processed foods
• Have type 2 diabetes
• Have metabolic syndrome

Certain medical conditions, including kidney disease, can affect magnesium balance. Because the kidneys regulate magnesium levels, people with moderate to severe kidney disease should consult their healthcare provider before taking magnesium supplements to avoid potentially dangerous magnesium buildup.

Which Form of Magnesium Is Best?

Several forms of magnesium supplements are available, and each has different absorption rates and uses.

Magnesium Taurate

Magnesium taurate combines magnesium with the amino acid taurine. Animal studies suggest it may support healthy blood pressure and overall heart health, although more human research is needed.

Magnesium Citrate

Magnesium citrate is one of the most easily absorbed forms. It effectively raises magnesium levels but may cause loose stools at higher doses.

Magnesium Glycinate

Magnesium glycinate is highly absorbable and gentle on the digestive system. It is commonly recommended for individuals who also experience anxiety, poor sleep, or muscle cramps.

Magnesium Chloride

Magnesium chloride is well absorbed and is frequently used to correct magnesium deficiency.

Magnesium Lactate

Magnesium lactate offers good absorption while being easier on the stomach than some other forms.

Magnesium Malate

Magnesium malate has primarily been studied for chronic fatigue and fibromyalgia. More research is needed to determine its effects on blood pressure.

Magnesium Oxide

Magnesium oxide contains a high amount of elemental magnesium but is less readily absorbed. It is more commonly used to relieve constipation or heartburn than to improve magnesium levels.

Magnesium Sulfate

Also known as Epsom salt, magnesium sulfate is commonly used in baths for muscle soreness. In medical settings, intravenous magnesium sulfate is used to treat certain emergency conditions, but Epsom salt baths have not been shown to significantly increase magnesium levels.

How Much Magnesium Should You Take?

Clinical studies suggest that daily magnesium intakes of approximately 350 to 400 mg may help support healthy blood pressure in some adults. Some studies have reported greater benefits with doses above 600 mg per day, but higher doses also increase the likelihood of digestive side effects, including diarrhea.

The Recommended Dietary Allowance (RDA) for magnesium varies by age and sex. Most healthy adults should aim to meet their magnesium needs through a balanced diet whenever possible.

Good dietary sources include:

• Green leafy vegetables such as spinach and kale
• Pumpkin seeds
• Almonds
• Cashews
• Black beans
• Edamame
• Whole grains
• Avocados
• Dark chocolate

A diet rich in these foods provides additional nutrients, including potassium and fiber, that also support healthy blood pressure.

Other Ways to Help Lower Blood Pressure

Magnesium is only one part of an overall heart-healthy lifestyle. Other proven strategies include:

• Following the DASH eating plan
• Limiting sodium intake
• Exercising regularly
• Maintaining a healthy weight
• Limiting alcohol consumption
• Avoiding tobacco products
• Managing stress
• Measuring your blood pressure regularly at home and during healthcare visits

If left untreated, hypertension raises blood pressure over time and significantly increases the risk of heart attack, stroke, heart failure, and chronic kidney disease. Working with your healthcare provider to develop a personalized treatment plan remains the most effective approach to protecting your long-term cardiovascular health.

Sources

• Houston M. The role of magnesium in hypertension and cardiovascular disease. J Clin Hypertens. 2011.
• Adebamowo SN, et al. Intakes of magnesium, potassium, and calcium and risk of stroke. Am J Clin Nutr. 2015.
• Jee SH, et al. Magnesium supplementation and blood pressure: meta-analysis. Am J Hypertens. 2002.
• NIH Office of Dietary Supplements: Magnesium fact sheet. Accessed 2024.
• Rosanoff A, et al. Oral magnesium therapy for hypertension: systematic review. Nutrients. 2021.
• Champagne CM. Magnesium in hypertension and related conditions: review. Nutr Clin Pract. 2008.