The basics come first
No supplement out-performs the proven steps for blood pressure: a DASH-style or Mediterranean diet, regular activity, healthy weight, limiting sodium and excess alcohol, and not smoking. Supplements, at best, add a modest nudge on top [4].
Where there's a real rationale
- Magnesium: adequate intake supports normal blood pressure, and shortfalls are common; supplementation has shown small reductions in some trials [1].
- Potassium: higher dietary potassium is associated with healthier blood pressure, which is why fruits and vegetables matter — but supplemental potassium can be dangerous for people with kidney problems or on certain blood-pressure medicines and requires medical supervision [2].
Studied with smaller or mixed effects
- Beetroot (dietary nitrate) may produce small, short-term reductions in blood pressure.
- Garlic has modest evidence for small blood-pressure effects.
- CoQ10, hawthorn, omega-3s, and L-citrulline have mixed or preliminary data; omega-3s are better established for triglycerides than blood pressure [3].
Safety and interactions
Several of these interact with medications — potassium with ACE inhibitors and potassium-sparing diuretics, omega-3s and garlic with blood thinners — so tell your clinician what you take [3][4]. Blood pressure is a number worth measuring: track it, and treat persistent elevation as a medical matter, not a supplement project.
Practical guidance
Favor the dietary sources first (magnesium- and potassium-rich foods), use a magnesium supplement to fill a gap if needed, be cautious with supplemental potassium, and keep supplements as a small addition to lifestyle and any prescribed treatment.
