Will Taking a Magnesium Supplement Have Any Effect on My Blood Pressure?

Magnesium is one of the minerals that is vital for our body. It plays important roles in muscle function, the nervous system, heart rhythm, bone health, and the regulation of blood pressure. In recent years, magnesium supplements have been promoted, especially on social media and the internet, as a "natural blood pressure medicine" or a "miracle mineral that lowers blood pressure." But is this true? Scientific research shows that magnesium supplements may lower blood pressure slightly in some people, but they cannot replace the treatment of high blood pressure on their own.

What Is Magnesium?

Magnesium is an essential mineral involved in more than 300 biochemical reactions in our body. Its main functions are:

• Supporting normal muscle function
• Supporting the nervous system
• Helping regulate heart rhythm
• Maintaining bone health
• Contributing to energy production
• Helping blood vessels relax

The body of an adult contains approximately 25 grams of magnesium.

How Can Magnesium Affect Blood Pressure?

The muscle layer of blood vessels constantly contracts and relaxes. Magnesium may help blood vessels relax. It may contribute to reducing arterial stiffness. It may allow blood vessels to widen more easily. It may balance the effect of calcium in cells. Thanks to these effects, small decreases in blood pressure may be seen. However, this effect is usually mild and is not the same for everyone.

What Does Scientific Research Say?

Meta-analyses combining many clinical studies show that magnesium supplementation can lower:

• Systolic (upper) blood pressure by an average of 2–4 mmHg
• Diastolic (lower) blood pressure by an average of 1–3 mmHg

This decrease may be more pronounced in some people, while others may see no change at all. There are studies suggesting that the effect may be more pronounced particularly in people with magnesium deficiency, people with mild hypertension, and people with diabetes.

Can Magnesium Replace Medication?

No. Magnesium supplements should not be used in place of the blood pressure medications prescribed by your doctor. The basic approach to treating high blood pressure is:

• Healthy eating
• Reducing salt intake
• Regular physical activity
• Maintaining a healthy weight
• Quitting smoking

and, when necessary, taking blood pressure medications regularly. Magnesium may only be a supportive option in suitable patients.

Who May Have Magnesium Deficiency?

Magnesium deficiency may be more common in the following people:

• Older adults
• People with diabetes
• People with long-lasting diarrhea due to non-kidney causes
• People with malabsorption disorders
• People who use stomach-protecting medications for a long time
• People who use certain diuretic (water pill) medications
• People who drink large amounts of alcohol

If there is a deficiency, replacement therapy recommended by a doctor may be beneficial.

Is It Possible to Get Magnesium from Food?

Yes. For most people, the healthiest way is to get magnesium from natural foods. Foods rich in magnesium include:

• Spinach and other dark green leafy vegetables
• Pumpkin seeds

Almonds

Hazelnuts Walnuts Dried legumes Whole grains Avocado Banana Dark chocolate with a high cocoa content Many people who eat a balanced diet may not need additional supplements.

Are All Magnesium Supplements the Same?

No. Different magnesium salts have different properties. The most commonly used forms are:

• Magnesium citrate
• Magnesium glycinate (bisglycinate)
• Magnesium lactate
• Magnesium malate
• Magnesium oxide

Some forms are better absorbed from the intestines, while others may cause diarrhea more often. The choice of supplement may vary depending on the person and the purpose of use.

Can Too Much Magnesium Be Harmful?

Yes. High-dose magnesium supplements, especially when used without supervision, can lead to the following problems:

• Diarrhea
• Nausea
• Abdominal pain
• Excessive drop in blood pressure
• Muscle weakness
• Heart rhythm disorders (especially in people with kidney failure)

For this reason, supplements should be used at recommended doses and on a doctor's advice.

Can Magnesium Be Used Together with Blood Pressure Medications?

In most cases, yes. However, some points should be kept in mind:

People with kidney disease must consult their doctor. It should not be taken at the same time as certain antibiotics and thyroid medications, as it may reduce their absorption. Magnesium levels may change in people who use diuretics. When used together with blood pressure medications, blood pressure may drop further in some people. For this reason, it is important for people who take medications regularly to consult a doctor or pharmacist before starting a supplement.

For Whom Might a Magnesium Supplement Be Considered?

On a doctor's recommendation, a supplement may be appropriate for people found to have magnesium deficiency, some patients with diabetes, people who use diuretics for a long time, people who cannot get enough magnesium from their diet, and selected patients with certain rhythm disorders. Not every patient with hypertension needs to take magnesium. Will magnesium bring my blood pressure completely back to normal? No. Magnesium may only provide a slight decrease in blood pressure in some people. It does not replace hypertension treatment. Can I stop my blood pressure medication and use magnesium instead? No. Stopping your blood pressure medication without your doctor's advice can lead to serious health problems. Should I still take it if I do not have a magnesium deficiency? There is no strong scientific evidence that you need to take it routinely. Most healthy individuals who eat a balanced diet can meet their daily magnesium needs from food. Which form of magnesium is better?

It depends on the purpose of use. Better-absorbed forms such as magnesium citrate, magnesium

glycinate, and magnesium lactate are often preferred. A healthcare professional should be consulted for the most appropriate choice.

Conclusion:

• Magnesium is an important mineral for heart and vascular health. Scientific studies show that magnesium
• supplementation may lower blood pressure slightly in some people, especially those with magnesium deficiency or
• mildly high blood pressure. However, this effect

is usually limited and does not replace the medications used to treat high blood pressure. A balanced diet, regular exercise, reducing salt intake, maintaining a healthy weight, and following the treatments recommended by your doctor are the most effective approaches to blood pressure control. If you are considering taking a magnesium supplement, it is strongly recommended that you consult your doctor, especially if you have kidney disease or take medications regularly.

References:

• •
• •
• •
• •
• •
• •
• •

Unger T, et al. 2020 International Society of Hypertension Global Hypertension Practice Guidelines. Hypertension. 2020 Jun;75(6):1334-1357. Volpe SL. Magnesium in disease prevention and overall health. Adv Nutr. 2013 May 1;4(3):378S-83S. McEvoy JW, et al. 2024 ESC Guidelines for the management of elevated blood pressure and hypertension. ESC Scientific Document Group. Eur Heart J. 2024 Oct 7;45(38):3912-4018. Tangvoraphonkchai K, Davenport A. Magnesium and Cardiovascular Disease. Adv Chronic Kidney Dis. 2018 May;25(3):251-260. Nielsen FH. The Role of Dietary Magnesium in Cardiovascular Disease. Nutrients. 2024 Dec 6;16(23):4223. Rosique-Esteban N, et al. Dietary Magnesium and Cardiovascular Disease: A Review with Emphasis in Epidemiological Studies. Nutrients. 2018 Feb 1;10(2):168. Massy ZA, Drüeke TB. Magnesium and cardiovascular complications of chronic kidney disease. Nat Rev Nephrol. 2015 Jul;11(7):432-42.

Download as PDF