Magnesium for High Blood Pressure (Hypertension)

B Good Evidence At least one randomized trial supports this, with mostly consistent results.

Meta-analysis of 34 RCTs: systolic -2.0 mmHg, diastolic -1.78 mmHg at 368 mg/day. Greater effects in magnesium-deficient populations. Approximately 50% of US adults consume below the estimated average requirement.

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The Bottom Line

Key Study Findings

Review

Dietary supplements and prevention of preeclampsia.

Dose: 500 mg daily vs: Placebo Outcome: Preeclampsia risk reduction Effect: ~50% risk reduction None

Population: Pregnant women with low calcium intake

Case Reports 13.0 weeks

A case report of Gitelman syndrome in children.

Dose: 3 g vs: None Outcome: pain reduction Effect: None None

Population: Hypokalemia

Review

Nutritional prevention of cognitive decline and dementia.

Dose: None vs: None Outcome: Cognitive decline prevention Effect: None None

Population: Older adults at risk of cognitive decline

Systematic Review

The impact of essential fatty acid, B vitamins, vitamin C, magnesium and zinc supplementation on …

Dose: varied: EFAs, B vitamins, vitamin C, magnesium, zinc as dietary supplements vs: Placebo Effect: None None

Review

Prevention of hypokalemia caused by diuretics.

Dose: None vs: None Outcome: mineral status Effect: None None

Population: hypertensive patients

Randomized Controlled Trial n=48 26.0 weeks

Effects of spironolactone on serum and muscle electrolytes in patients on long-term diuretic therapy for …

Dose: 100 mg/d vs: control group Outcome: blood pressure Effect: None None

Population: hypertensive patients

Key Statistics

Studies

2028

Participants

↑

Positive

Grade

Referenced Papers

Dietary supplements and prevention of preeclampsia. Review

Hypertension research : … 2025 10 citations

A case report of Gitelman syndrome in children. Case Report

Medicine 2023

Nutritional prevention of cognitive decline and dementia. Review

Acta bio-medica : … 2018 103 citations

The impact of essential fatty acid, B vitamins, vitamin C, magnesium and zinc supplementation on stress levels in women: a … Systematic Review

JBI database of … 2017 38 citations

Prevention of hypokalemia caused by diuretics. Review

Heart disease and … 1994

Effects of spironolactone on serum and muscle electrolytes in patients on long-term diuretic therapy for congestive heart failure and/or arterial … RCT

European journal of … 1986 22 citations

Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

Commonly Used Dosages

general:: 310-420 mg/day
bloodpressuresupport:: 300-500 mg/day
cardiovascularsupport:: 300-400 mg/day elemental magnesium

Upper limit: 350 mg/day from supplements only (no UL for food magnesium)

Dosages Studied in Research

Dosage	Duration	Effect	N
500 mg daily	--	Positive	--
3 g	13.0 weeks	Mixed	--
None	--	Mixed	--
varied: EFAs, B vitamins, vitamin C, magnesium, zinc as dietary supplements	--	Mixed	--
None	--	Mixed	--
100 mg/d	26.0 weeks	Mixed	48

Best taken: With meals to reduce GI side effects; evening dosing may support sleep

Safety & Side Effects

Reported Side Effects

⚠ Diarrhea (especially magnesium oxide and citrate)
⚠ Nausea
⚠ Abdominal cramping
⚠ Excessive doses may cause hypotension or cardiac depression

Known Interactions

● Bisphosphonates (reduced absorption — separate by 2 hours)
● Antibiotics (tetracyclines, fluoroquinolones — separate by 2-4 hours)
● Diuretics (thiazides reduce, loop diuretics increase magnesium loss)
● Proton pump inhibitors (long-term use may cause hypomagnesemia)

Tolerable upper intake: 350 mg/day from supplements only (no UL for food magnesium)

Always consult your healthcare provider before starting any supplement.

Frequently Asked Questions

Does Magnesium help with High Blood Pressure (Hypertension)?

Based on 34 studies with 2,028 participants, there is moderate evidence from clinical studies that Magnesium may support High Blood Pressure (Hypertension) management. Our evidence grade is B (Good Evidence).

How much Magnesium should I take for High Blood Pressure (Hypertension)?

Studies have used various dosages. A commonly studied range is 310-420 mg/day. Always consult your healthcare provider before starting any supplement regimen.

Are there side effects of Magnesium?

Reported side effects may include Diarrhea (especially magnesium oxide and citrate), Nausea, Abdominal cramping, Excessive doses may cause hypotension or cardiac depression. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.

How strong is the evidence for Magnesium and High Blood Pressure (Hypertension)?

We rate the evidence as Grade B (Good Evidence). This rating is based on 34 peer-reviewed studies with 2,028 total participants. The overall direction of effect is positive.

Other ingredients for High Blood Pressure (Hypertension)

Beetroot Extract A Garlic A Potassium B Quercetin B Grape Seed Extract B Coenzyme Q10 (CoQ10) B

Magnesium for other conditions

Cardiac Arrhythmia B Coronary Artery Disease (CAD) C

Quick Verdict

Evidence Strength72%

High confidence

Study Breakdown

RCT (1)Meta (0)Other (33)

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References

[1] Takafumi Ushida et al.. Hypertens Res. 2025. Dietary supplements and prevention of preeclampsia. doi:10.1038/s41440-025-02144-9 PubMed
[2] Jing Ying et al.. Medicine (Baltimore). 2023. A case report of Gitelman syndrome in children. doi:10.1097/MD.0000000000033509 PubMed
[3] Ligia J Dominguez et al.. Acta Biomed. 2018. Nutritional prevention of cognitive decline and dementia. doi:10.23750/abm.v89i2.7401 PubMed
[4] Delia McCabe et al.. JBI Database System Rev Implement Rep. 2017. The impact of essential fatty acid, B vitamins, vitamin C, magnesium and zinc supplementation on stress levels in women: a … doi:10.11124/JBISRIR-2016-002965 PubMed
[5] E Bourke et al.. Heart Dis Stroke. 1994. Prevention of hypokalemia caused by diuretics. PubMed
[6] T Dyckner et al.. Eur J Clin Pharmacol. 1986. Effects of spironolactone on serum and muscle electrolytes in patients on long-term diuretic therapy for congestive heart failure and/or arterial … doi:10.1007/BF00542411 PubMed

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.

Magnesium for High Blood Pressure (Hypertension)

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The Bottom Line

Key Study Findings

Key Statistics

Referenced Papers

Dosage & Usage

Commonly Used Dosages

Dosages Studied in Research

Safety & Side Effects

Reported Side Effects

Known Interactions

Frequently Asked Questions

Related Evidence

Other ingredients for High Blood Pressure (Hypertension)

Magnesium for other conditions

References