Supplements · Metabolic & Cardiometabolic
magnesium decreases blood pressure
In plain terms: Can taking magnesium lower your blood pressure?
Part of: 🧪 magnesium
Modestly—roughly 2–3 mmHg in most people (more in those with hypertension, diabetes or low magnesium), so real but small.
📅 Last reviewed: 2026-07-15 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
Magnesium supplementation produces a modest blood-pressure reduction (~2–3 mmHg systolic in normotensives; larger, ~5–6 mmHg, in type-2 diabetics/hypertensives), most reliable at >300 mg/day for >12 weeks. Newer umbrella/pooled reviews note the effect is inconsistent across populations, tempering an otherwise consistent direction.
The evidence (13)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Eriksson J, Kohvakka A 1995 · Ann Nutr Metab | RCT | mixed | low | Mg lowered SBP/DBP in insulin-dependent but not non-insulin-dependent diabetics — population-dependent. |
| Zhang X, Li Y, Del Gobbo LC, Rosanoff A, Wang J, Zhang W, Song Y 2016 · Hypertension | meta-analysis | supports | moderate | MA 34 double-blind RCTs (n=2028): Mg ~368 mg/d ~3 mo reduced SBP 2.00 / DBP 1.78 mmHg; dose-response, causal inference. |
| Sacks FM, Willett WC, Smith A, Brown LE, Rosner B, Moore TJ 1998 · Hypertension | RCT | contradicts | moderate | Normotensive women with low mineral intake (RCT): Mg supplements did NOT lower BP (only potassium did). |
| Jee SH, Miller ER, Guallar E, Singh VK, Appel LJ, Klag MJ 2002 · Am J Hypertens | meta-analysis | supports | low | MA of RCTs: modest, dose-dependent BP reduction; results heterogeneous across trials. |
| Dereli S 2026 · Magnesium research | observational | mixed | low | Single-arm, n=110 PP; Mg-taurate-K-citrate (121mg elemental Mg)+lifestyle, 3mo: HBPM -11/-8, ABPM -11/-8 mmHg (p<0.001), low-risk elevated-BP/stage-1 HTN adults |
| Papagiannidou A, Mitropoulou M, Papantzikos K, Petropoulou D, Tsilingiris D, Magkos F, Dalamaga M 2026 · Curr Nutr Rep | observational | supports | low | Narrative review: 'meta-analyses of RCTs indicate...modest but clinically relevant improvements in blood pressure...particularly in individuals with baseline hypomagnesemia' |
| Behers BJ, Behers BM, Stephenson-Moe CA, Vargas IA, Meng Z, Thompson AJ, Melchor J, Wojtas CN, Rosario MA, Baker JF, Deevers AC, Mouratidis RW, Sweeney MJ 2024 · Nutrients | meta-analysis | supports | moderate | SR/subgroup MA, general normotensive population: Mg reduced SBP by -2.79 mmHg; dose/duration-optimized analysis. |
| Xiong Y, Xu J, Wang J, He R, Hu M, Pan A, Jiang L 2026 · Nutrition journal | observational | contradicts | low | Cross-sectional, n=867 Chinese adults: whole-blood Mg POSITIVELY associated with hypertension prevalence, OR 2.19 (1.36-3.54) extreme-tertile; opposite direction |
| Zhao B, Deng H, Li B, Chen L, Zou F, Hu L, Wei Y, Zhang W 2020 · Diabetes Metab Res Rev | meta-analysis | supports | moderate | Same SR/TSA: Mg supplementation also reduced SBP and DBP. |
| Argeros Z, Xu X, Bhandari B, Harris K, Touyz RM, Schutte AE 2025 · Hypertension | meta-analysis | supports | moderate | 2025 SR/MA (Hypertension): reports of Mg effect on BP inconsistent across hypertensive vs normotensive populations. |
| Cámara M, Sánchez-Gavilán I, Sesso HD 2026 · Nutrition research (New York, N.Y.) | observational | supports | low | Narrative review of RCTs: 'Mg supplementation is associated with a significant reduction in SBP vs placebo'; synergy explored with vitamin D, esp. T2D/overweight |
| Asbaghi O, Hosseini R, Boozari B, Ghaedi E, Kashkooli S, Moradi S 2021 · Biol Trace Elem Res | meta-analysis | supports | moderate | MA in T2D: SBP -5.78 mmHg, DBP -2.50 mmHg; significant for >300 mg/day, >12 wk, inorganic forms; no weight/BMI change. |
| Alharran AM, Alzayed MM, Jamilian P, Prabahar K, Kamal AH, Alotaibi MN, Elshaer OE, Alhatm M, Masmoum MD, Hernández-Wolters B, Sindi R, Kord-Varkaneh H, Abu-Zaid A 2024 · Curr Ther Res Clin Exp | meta-analysis | supports | moderate | Umbrella MA pooling 10 meta-analyses of RCTs (8610 participants): SBP 'ES = -1.25 mmHg; 95% CI: -1.98, -0.51, P = 0.001', DBP -1.40 mmHg (95% CI -2.04, -0.75); I2 92-93%. Units are meta-analyses, not trials — double counts its inputs; review, zero weight. |
Disagree, or know a study we missed?
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.