Magnesium Science
What the research actually says about magnesium.
Magnesium Science catalogues peer-reviewed research on magnesium and describes what each study examined and reported, linking back to the original publications.
Evidence first
We summarize published human research on magnesium and derive references from verified evidence records.
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Where to begin
Magnesium Guide
A practical path through magnesium forms, dosing, sleep, anxiety, migraines, deficiency, and product selection.
Follow the structured guide →Best Magnesium Supplements, Compared
An evidence-informed comparison of leading magnesium supplements, evaluated on form, labeled amount, transparency, and independent testing.
Compare products →What is magnesium?
An introduction to magnesium, an essential dietary mineral, and how Magnesium Science catalogues the research.
Read the foundational guide →Frequently asked questions
Magnesium FAQs, answered from verified evidence
Start with a direct answer, then review the evidence context, limitations, and claim-derived references.
Does magnesium help constipation?
A small randomized trial found that magnesium oxide improved symptoms and bowel-movement frequency more than placebo over 28 days in adults with chronic idiopathic constipation.
Read the sourced answer →Does magnesium help sleep?
The human evidence is limited. A meta-analysis of three small trials in older adults with insomnia found that magnesium shortened the time to fall asleep by about 17 minutes versus placebo, while the increase in total sleep time was not statistically significant.
Read the sourced answer →How do different forms of magnesium differ?
Magnesium forms differ in the compound paired with magnesium, which can affect solubility, elemental-magnesium delivery, and absorption. In a small human study, citrate was more soluble and more bioavailable than oxide.
Read the sourced answer →What are signs of magnesium deficiency?
Magnesium deficiency means having too little magnesium for the body's needs, but it can be difficult to identify from symptoms or a routine blood test alone because serum magnesium does not reliably reflect total-body or tissue magnesium.
Read the sourced answer →What does magnesium do in the body?
Magnesium is an essential dietary mineral that acts as a cofactor in more than 300 enzyme systems involved in processes such as energy production, protein synthesis, and normal muscle and nerve function.
Read the sourced answer →Featured research
Start with the evidence
Magnesium and Sleep
An evidence-first look at whether oral magnesium supplementation helps sleep, drawing on a meta-analysis and a systematic review focused mainly on older adults and people with insomnia.
Published June 22, 2026Read the research →Magnesium Glycinate vs Citrate
An evidence-based look at how magnesium forms differ in absorption, comparing what human research shows about magnesium citrate versus magnesium oxide and where glycinate fits in.
Published June 22, 2026Read the research →Signs of Magnesium Deficiency
What magnesium deficiency (hypomagnesemia) is, why a routine blood test may miss it, and which dietary patterns are commonly linked to low magnesium status, based on two narrative reviews.
Published June 22, 2026Read the research →More research
Latest Research
Magnesium and Anxiety
Two systematic reviews suggest magnesium supplementation may modestly ease subjective anxiety in vulnerable groups, but the evidence is low quality and far from settled.
Published June 22, 2026Read the research →Magnesium and Blood Pressure
Meta-analytic evidence on whether oral magnesium supplementation modestly lowers blood pressure in adults, including the doses studied and the limitations of the data.
Published June 22, 2026Read the research →Magnesium and Blood Sugar
What meta-analyses of human studies report about magnesium intake and supplementation in relation to blood sugar, fasting plasma glucose, and type 2 diabetes risk.
Published June 22, 2026Read the research →How we evaluate
Transparent methodology
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