Can magnesium lower blood pressure?
Last updated September 3, 2026.
Magnesium supplements lower blood pressure modestly: meta-analyses put the effect at roughly 3 to 4 mmHg systolic and 2 to 3 diastolic, with bigger drops above 370 mg a day and in people with low baseline intake. That is a genuine but small effect, worth having as part of a broader plan, not a substitute for medication when pressure is meaningfully high. The food route doubles as good diet advice: leafy greens, nuts, seeds, legumes, and whole grains are magnesium-dense and align with the DASH pattern. If supplementing, studied doses run 300 to 400 mg daily, with citrate or glycinate forms absorbed better than oxide. Know the guardrails: diarrhea is the dose ceiling signal, kidney disease makes magnesium supplementation a doctor-supervised decision, and magnesium binds certain antibiotics and osteoporosis drugs, so separate them by hours. As always, supplements belong on the medication list you show your clinician, especially when you already take blood pressure drugs.
What to do
- Expect 3 to 4 systolic points: helpful, not transformative.
- Food first: greens, nuts, seeds, beans, whole grains.
- If supplementing: 300 to 400 mg daily, citrate or glycinate forms.
- Loose stools = too much: back the dose down.
- Kidney disease? No magnesium supplements without medical sign-off.
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