Magnesium is one of the most popular supplements for sleep. This article looks at what the research says, and how much weight it can bear.
The evidence on magnesium for sleep
Limited evidence
Insufficient Preliminary Limited Moderate Strong
Quality of the evidence
Low
Studies counted
5 human studies and 4 systematic reviews. Of the individual studies, 2 found a benefit, 1 found no effect and 1 had mixed results.
Reviewed
7 November 2026 by Holistic Land staff. Next review due November 2027.
What the research suggests
Studies of magnesium supplements for sleep have produced inconsistent results. Some small trials suggest modest improvements in self-reported insomnia symptoms or time taken to fall asleep, especially in older adults or people with poor sleep, while other trials found that people taking a placebo improved just as much. Reviews of the research rate the certainty of the evidence as low to very low, and the largest recent trial found only a small effect after four weeks. Overall, any benefit appears small and uncertain, and objective sleep measures have mostly shown no clear change.
The studies
The Role of Magnesium in Sleep Health: a Systematic Review of Available Literature.
Systematic review, 2023, 7,582 people. Biological trace element research
PubMed record
Mixed results
Oral magnesium supplementation for insomnia in older adults: a Systematic Review & Meta-Analysis.
Meta-analysis, 2021, 151 people. BMC complementary medicine and therapies
PubMed record
Free full text
Mixed results
Examining the Effects of Supplemental Magnesium on Self-Reported Anxiety and Sleep Quality: A Systematic Review.
Systematic review, 2024, 375 people. Cureus
PubMed record
Free full text
Mixed results
Show 6 more studies
Magnesium Supplementation for Sleep in Adults: A Systematic Review of Randomized Controlled Trials.
Systematic review, 2026. Journal of dietary supplements
PubMed record
Free full text
Mixed results
Effects of magnesium and potassium supplementation on insomnia and sleep hormones in patients with diabetes mellitus.
Randomised trial, 2024, 320 people. Frontiers in endocrinology
PubMed record
Free full text
Unclear
Magnesium Bisglycinate Supplementation in Healthy Adults Reporting Poor Sleep: A Randomized, Placebo-Controlled Trial.
Randomised trial, 2025, 155 people. Nature and science of sleep
PubMed record
Free full text
Found a benefit
The effects of magnesium L-threonate (Magtein(®)) on cognitive performance and sleep quality in adults: a randomised, double-blind, placebo-controlled trial.
Randomised trial, 2025, 100 people. Frontiers in nutrition
PubMed record
Free full text
Mixed results
Magnesium supplementation improves indicators of low magnesium status and inflammatory stress in adults older than 51 years with poor quality sleep.
Randomised trial, 2010, 100 people. Magnesium research
PubMed record
Found no effect
Effect of short-term magnesium supplementation on anxiety, depression and sleep quality in patients after open-heart surgery.
Controlled trial (not randomised), 2022, 60 people. Magnesium research
PubMed record
Found a benefit
Why magnesium? Magnesium takes part in hundreds of processes in the body, including the nervous system. Low intake is common, and some people take it in the evening hoping to fall asleep faster.
What the studies looked at Trials have tested magnesium tablets, drinks and sprays in older adults, people with insomnia and healthy volunteers, usually for a few weeks.
Talk to your GP or pharmacist before starting a supplement, especially if you take other medicines.
Comments (0)