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Mg8.5
Magnesium Research
Likely helps
278 peer-reviewed studies
What the evidence says
Likely helps
Magnesium appears to help in 9 of 12 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 277 studies · 56 meta-analyses · 187 RCTs · 24,229 total participants
Confidence
High confidence
What the studies found
9helped2unclear1didn't help· 265 more without graded effect data
By outcome
Heart & blood pressureImproved blood pressure and vascular health within 4-8 weeks · 4-8 weeks
Mostly mechanism / observational54 studies
Glucose & metabolicImproved insulin sensitivity in deficient individuals · 4-8 weeks · Modestly improves insulin sensitivity, especially when deficient · 4-12 weeks
Mostly mechanism / observational40 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
Cognitive function
Mostly mechanism / observational8 studies
Safety profile
Mostly mechanism / observational7 studies
Muscle cramps & function
Mostly mechanism / observational6 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 37 studies with measurable effects
Likely real effects
89%
across studies
People studied
24k
typical study: 164 people
Strongest designs
243
56 pooled, 187 randomised
Showed benefit
75%
9/12 studies
How long studies ran
1–4 weeks
1
1–3 months
2
3+ months
3
Populations Studied
General population2
Adults2
Type 2 diabetes patients1
Diverse patient groups1
Active research area
104 studies in the last 5 years · Latest meta-analysis: 2026
197920022026
1Magnesium levelsMeta-Analysisn=1,100 · large study2026
In plain English: 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)].
2New-onset atrial fibrillationMeta-Analysisn=4,713 · very large study2023
In plain English: Use of magnesium did not reduce the incidence of NOAF, however these studies represent diverse groups and are hindered by significant bias.
Curran J et al. · PloS one (2023)
Use of magnesium did not reduce the incidence of NOAF, however these studies represent diverse groups and are hindered by significant bias.
Further studies are necessary to determine if there is benefit to magnesium prophylaxis for NOAF in non-cardiac surgery patients.
3Self-reported anxiety and sleep qualitySystematic Reviewn=800 · large study2024
In plain English: Five out of eight sleep-related studies reported improvements in sleep parameters, while two studies reported no improvements, and one reported mixed results.
5PCOS biomarkersMeta-Analysisn=504 · large study2022
In plain English: 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.