Research Snapshot
Magnesium
A synthesis of the peer-reviewed evidence for Magnesium across sleep, cognition, stress and mood, graded by scientific consensus and reviewed by our Scientific Advisory Board.
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SleepDoes Magnesium support sleep?
Evidence from 10 studies
What the research shows
Magnesium may support sleep by improving sleep quality and reducing sleep onset latency, particularly in older adults and women. However, the evidence is mixed, and further high-quality research is needed to confirm these findings and establish clear guidelines for magnesium supplementation for sleep improvement.
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Sleep Medicine | R. Allen et al. | 3 | 2003
Randomized Control Trial (RCT)
Oral magnesium supplementation improves slow-wave sleep, delta and sigma frequency EEG power, and reverses the aging effect on cortisol release and renin-angiotensin-aldosterone system activity in elderly adults.
Sleep | Y. Zhang et al. | 6 | 2021
Very Rigorous Journal
Higher magnesium intake is associated with better sleep quality and reduced likelihood of short sleep (7 hours).
Nutrition Journal | O. Barna et al. | 2 | 2021
Randomized Control Trial (RCT) , Very Rigorous Journal
Magnesium oxide monohydrate treatment resulted in greater improvement in sleep quality compared to placebo.
Pakistan Journal of Health Sciences | A. Liaqat et al. | 0 | 2023
Randomized Control Trial (RCT)
Magnesium supplementation in elderly people has highly significant effects in improving insomnia and quality of sleep.
CognitionDoes Magnesium Glycinate improve cognition?
Evidence from 10 studies
What the research shows
While direct evidence on Magnesium Glycinate's impact on cognition is not available, general magnesium intake has been linked to improved cognitive function, particularly in older adults. The potential cognitive benefits of magnesium may be enhanced by adequate vitamin D levels. Further research is needed to specifically explore the effects of Magnesium Glycinate on cognition.
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Journal of Alzheimer's disease : JAD | X. Zhu et al. | 14 | 2020
Randomized Control Trial (RCT) , Rigorous Journal
Reducing the Ca:Mg ratio to around 2.3 by personalized magnesium supplementation significantly improved cognitive function by 9.1% in those aged over 65 years old with a high dietary Ca:Mg ratio.
Alzheimer's & Dementia : Translational Research & Clinical Interventions | M. Tao et al. | 5 | 2022
Rigorous Journal
Higher magnesium intake is associated with better cognition in older adults.
Current developments in nutrition | N. Peeri et al. | 0 | 2019
Very Rigorous Journal
Higher serum 25(OH)D levels were associated with reduced risk of low cognitive function in older adults, and this association appeared to be modified by the intake level of magnesium.
Neuron | I. Slutsky et al. | 316 | 2010
Non-Randomized Control Trial , Animal Trial , Rigorous Journal , Highly Cited
Elevating brain magnesium enhances learning abilities, working memory, and short- and long-term memory in rats.
StressDoes Magnesium Glycinate support stress levels?
Evidence from 10 studies
What the research shows
Magnesium supplementation, including forms like magnesium glycinate, may support stress reduction, particularly in individuals with low magnesium levels or specific stress-related conditions. While some studies suggest enhanced benefits when combined with vitamin B6, the overall evidence is varied, and further well-designed clinical trials are needed to establish definitive conclusions.
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PLoS ONE | E. Pouteau et al. | 44 | 2018
Randomized Control Trial (RCT) , Rigorous Journal
Oral magnesium supplementation alleviated stress in healthy adults with low magnesemia, but combined with vitamin B6 showed greater benefit for severe/extremely severe stress.
Nutrients | A. Botturi et al. | 83 | 2020
Very Rigorous Journal , Highly Cited , Systematic Review
Magnesium supplementation could be beneficial in depressive symptoms, but the results are not univocal and need further evaluation.
Nutrients | N. Boyle et al. | 86 | 2017
Very Rigorous Journal , Highly Cited , Systematic Review
Magnesium supplementation has a beneficial effect on subjective anxiety in anxiety vulnerable samples, but the quality of the existing evidence is poor and further confirmation is needed.
Stress and Health | L. Noah et al. | 16 | 2021
Randomized Control Trial (RCT)
Magnesium supplementation, with or without vitamin B6, can provide a meaningful clinical benefit in daily life for individuals with stress and low magnesemia.
MoodCan magnesium support mood?
Evidence from 15 studies
What the research shows
Magnesium appears to have a potential role in supporting mood, particularly in supporting healthy mood. While supplementation shows promise, especially in individuals with magnesium deficiency, further high-quality research is needed to fully understand its efficacy and optimal use in supporting healthy mood.
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BJPsych Open | D. Phelan et al. | 25 | 2018
Rigorous Journal
Magnesium supplementation was associated with a decline in depressive symptoms in uncontrolled trials but not in placebo-controlled trials.
PLoS ONE | E. Tarleton et al. | 79 | 2017
Randomized Control Trial (RCT) , Rigorous Journal
Magnesium supplementation for 6 weeks resulted in a clinically significant net improvement in depression symptoms and anxiety scores.
Obstetrics & Gynecology | F. Facchinetti et al. | 156 | 1991
Randomized Control Trial (RCT) , Highly Cited
Oral magnesium supplementation significantly reduced premenstrual mood changes.
Nutrients | A. Botturi et al. | 61 | 2020
Very Rigorous Journal
Supplementation with magnesium could be beneficial in reducing depressive symptoms.
Reviewed by Experts
Every research snapshot is checked by our independent Scientific Advisory Board: physicians, botanists and pharmacology researchers who verify the evidence grading and its interpretation.
Kerry Hughes
M.Sc., RH(AHG), FDN-P
Ethnobotanist & herbalist; Berkeley Herbal Center; principal at EthnoPharm.
View full profile →Lance Dreher
PhD, Nutritional Counseling
Performance nutrition & conditioning; four decades of applied training science.
View full profile →Dr. Lindsey Faucette
DO, FAAFP
Board-certified in Family & Integrative Medicine; Touro University College of Osteopathic Medicine.
View full profile →Francisco Chacon
PhD, Plant Biology
Botanical natural products & phytochemistry researcher, Penn State University.
View full profile →Meet the full Scientific Advisory Board →
How We Grade Consensus
For each benefit we retrieve the relevant peer-reviewed literature and classify every study by whether its findings support (Yes), partially or conditionally support (Possibly), or do not support (No) the claim. The donut shows the share of studies in each category; N is the number of studies analyzed for that benefit.
Grades reflect the weight and direction of the current evidence, not a guarantee of outcome, and the interpretation is verified by the Scientific Advisory Board.