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Mg8.5
Magnesium Research
Likely helps
290 peer-reviewed studies
What the evidence says
Likely helps
Magnesium appears to help in 12 of 16 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1979–2026 with a typical study size of 164 participants.
Based on 290 studies · 65 meta-analyses · 190 RCTs · 37,071 total participants
Confidence
High confidence
What the studies found
12helped3unclear1didn't help· 274 more without graded effect data
By outcome
Heart & blood pressureImproved blood pressure and vascular health within 4-8 weeks · 4-8 weeks
Mostly mechanism / observational56 studies
Glucose & metabolicImproved insulin sensitivity in deficient individuals · 4-8 weeks · Modestly improves insulin sensitivity, especially when deficient · 4-12 weeks
Mostly mechanism / observational42 studies
Bone health & women's healthSupports healthy estrogen metabolism and hormonal equilibrium · 4-8 weeks · May help reduce menstrual discomfort and PMS symptoms · 1-3 cycles · Provides essential nutrients for healthy pregnancy · Ongoing
Depression & moodMeta-analyses show significant improvement in depression and mood scores · 2-4 weeks
Mostly mechanism / observational9 studies
Muscle cramps & function
Mostly mechanism / observational8 studies
Safety profile
Mostly mechanism / observational8 studies
Anxiety & stressReduced anxiety and stress response · 1-2 weeks · Blunting of stress reactivity and cortisol regulation · 2-4 weeks
Mostly mechanism / observational5 studies
Migraine & headache
Mostly mechanism / observational3 studies
By the numbers
Pulled from 45 studies with measurable effects
Likely real effects
89%
across studies
People studied
37k
typical study: 164 people
Strongest designs
255
65 pooled, 190 randomised
Showed benefit
75%
12/16 studies
How long studies ran
1–4 weeks
2
1–3 months
2
3+ months
3
Populations Studied
Adults4
Pregnant women2
General population2
Type 2 diabetes patients1
Active research area
113 studies in the last 5 years · Latest meta-analysis: 2026
197920022026
1Magnesium levelsMeta-Analysisn=1,100 · large study2026
This systematic review and meta-analysis conclude that magnesium levels are significantly lower in patients with diabetic retinopathy than in diabetic controls without retinopathy.
Kubbara EA et al. · Nutrients (2026)
Huge benefit
← WorseNo effectBetter →
Likely real
The random-effects model indicated significantly lower magnesium levels in patients with diabetic retinopathy compared to diabetic controls [SMD = -1.19, 95% CI (-1.68; -0.70); p < 0.0001; I2 = 95%].
Meta-regression analysis revealed that year of publication (coefficient = 0.061; p = 0.009) and non-Asian studies (coefficient = 2.376; p = 0.001) were positively associated with the pooled effect size, while the NOS quality score was inversely associated (coefficient = -0.709; p = 0.035).
The magnesium levels were significantly lower in patients with proliferative diabetic retinopathy compared with those with non-proliferative diabetic retinopathy using a fixed effect model [SMD = -1.41, (95% CI: -1.83; -1.00); p < 0.01; I2 = 32%; Cochran's Q statistic (Q = 1.46, p < 0.23)].
2Systolic blood pressure reductionMeta-AnalysisCited 4×n=2,709 · very large study2025
Magnesium intake resulted in a reduction in systolic BP of -2.81 mm Hg (95% CI, -4.32 to -1.29) and diastolic BP by -2.05 mm Hg (95% CI, -3.23 to -0.88) compared with placebo.
5Self-reported anxiety and sleep qualitySystematic ReviewCited 7×n=800 · large study2024
Five out of eight sleep-related studies reported improvements in sleep parameters, while two studies reported no improvements, and one reported mixed results.
6Hospitalisation during pregnancyMeta-AnalysisCited 96×n=9,090 · very large study2014
There is not enough high-quality evidence to show that dietary magnesium supplementation during pregnancy is beneficial.
Makrides M et al. · The Cochrane database of systematic reviews (2014)
Large benefit
← WorseNo effectBetter →
Women receiving magnesium were significantly less likely to require hospitalisation during pregnancy (RR 0.65, 95% CI 0.48 to 0.86; three trials, 1158 women).Of the 10 trials included in the review, only two were judged to be of high quality overall.
There is not enough high-quality evidence to show that dietary magnesium supplementation during pregnancy is beneficial.
7PCOS biomarkersMeta-AnalysisCited 20×n=504 · large study2022
This meta-analysis highlights the potential anti-hyperlipidemic, anti-oxidant, and anti-inflammatory properties of vitamin E supplementation alone or in combination with omega-3 or magnesium on PCOS patients.
Heidari H et al. · Scientific reports (2022)
No significant effect was found on HDL-c, glycemic indices, hormonal profile, anthropometric measurements, and other biomarkers of inflammation or oxidative stress.
This meta-analysis highlights the potential anti-hyperlipidemic, anti-oxidant, and anti-inflammatory properties of vitamin E supplementation alone or in combination with omega-3 or magnesium on PCOS patients.