Magnesium — Research Evidence

Source: PubMed / NCBI · human studies preferred · ranked by evidence qualityLast analyzed: May 23, 2026

🔵Mixed Evidence

20 studies·2 RCTs·12 reviews

The summary below was generated by an AI system (Claude) based on the studies listed. It is a synthesis tool, not a clinical opinion. Read individual studies for full context.

Several important caveats limit how confidently these findings can be applied. Most studies are conducted in specific populations — older adults, people with diabetes, or individuals under elevated stress — making it difficult to extrapolate benefits to the general healthy adult population. The RCT evidence is of moderate quality overall, and a large proportion of claims reviewed lacked sufficient direct support in this literature set. The bioavailability of different magnesium forms varies, but head-to-head comparisons of specific forms for specific outcomes (e.g., magnesium threonate for sleep in healthy adults) remain limited. Key questions about optimal dosing, duration of supplementation, and whether benefits persist long-term remain inadequately answered by the current evidence base.

Key findings

✓A systematic review and meta-analysis found oral magnesium supplementation may improve insomnia outcomes in older adults, providing partial support for sleep-related claims — though evidence in younger, healthy populations is weaker.
✓A meta-analysis of double-blind RCTs found magnesium supplementation can improve glucose metabolism parameters in people with or at risk of diabetes, suggesting metabolic benefits in higher-risk populations.
✓Systematic reviews on anxiety and stress report suggestive benefits, but findings are not strong or consistent enough to draw firm conclusions.
✓Systematic reviews on exercise and muscle soreness show inconsistent results across study designs and populations, with no clear consensus on performance benefits.
✓A systematic review on magnesium bioavailability confirms that different supplement forms are absorbed differently, which matters for comparing outcomes across studies using varied formulations.

Evidence gaps

?Very little high-quality RCT evidence exists for magnesium supplementation in healthy, non-deficient younger adults — most benefit data comes from older adults or people with underlying metabolic conditions.
?Direct comparative trials between specific magnesium forms (e.g., glycinate vs. threonate vs. malate) for outcomes like sleep quality are lacking, making form-specific recommendations largely unsupported by the available evidence.
?Long-term safety and efficacy data beyond short-duration trials are scarce across most health domains studied.

Safety summary

Magnesium is generally considered safe at supplemental doses for most adults, with the primary adverse effect being gastrointestinal discomfort (e.g., loose stools), which varies by form. The studies reviewed do not raise significant safety concerns at typical supplemental doses, but individuals with kidney disease should exercise caution due to impaired magnesium excretion.

Studies (20)

Health aspects of vegan diets among children and adolescents: a systematic review and meta-analyses.

Critical reviews in food science and nutrition · 2024 · Koller A et al.

Meta-Analysis🟢

Key finding

Health aspects of vegan diets among children and adolescents: a systematic review and meta-analyses.

PMID: 37811643DOI: 10.1080/10408398.2023.2263574

Magnesium — Research Evidence

Key findings

Evidence gaps

Safety summary

Studies (20)

Health aspects of vegan diets among children and adolescents: a systematic review and meta-analyses.

Oral magnesium supplementation for insomnia in older adults: a Systematic Review & Meta-Analysis.

Oral Magnesium Supplementation for Treating Glucose Metabolism Parameters in People with or at Risk of Diabetes: A Systematic Review and Meta-Analysis of Double-Blind Randomized Controlled Trials.

Nutritional interventions for preventing and treating pressure ulcers.

Magnesium and Cognitive Health in Adults: A Systematic Review and Meta-Analysis.

The effect of magnesium supplementation on muscle fitness: a meta-analysis and systematic review.

The Effects of Magnesium Supplementation on Subjective Anxiety and Stress-A Systematic Review.

Bioavailability of magnesium food supplements: A systematic review.

Nutrition, Obesity, and Seborrheic Dermatitis: Systematic Review.

Effects of magnesium supplementation on muscle soreness in different type of physical activities: a systematic review.

Effect of magnesium and vitamin B6 supplementation on mental health and quality of life in stressed healthy adults: Post-hoc analysis of a randomised controlled trial.

Effects of Magnesium Supplementation on Muscle Soreness and Performance.

Can Magnesium Enhance Exercise Performance?

Calcium, vitamin D, vitamin K2, and magnesium supplementation and skeletal health.

Magnesium and Migraine.

Magnesium in the gynecological practice: a literature review.

Magnesium in Obesity, Metabolic Syndrome, and Type 2 Diabetes.

Magnesium and Cardiovascular Disease.

Magnesium Deficiency and Cardiometabolic Disease.

Magnesium in joint health and osteoarthritis.