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Does magnesium help you sleep?
Maybe, a little. In the few small trials, magnesium helped older adults with insomnia fall asleep about 17 minutes faster, but the evidence is low quality and showed no statistically significant gain in total sleep.
Updated October 1, 2026 · 2 sources, listed at the end
What the trials found
A 2021 systematic review found only three randomized trials of oral magnesium for insomnia, with 151 older adults between them. Compared with placebo:
| Measure | Magnesium vs placebo |
|---|---|
| Time to fall asleep | About 17 minutes faster (statistically significant) |
| Total sleep | About 16 minutes more (not statistically significant) |
| Quality of the evidence | Low to very low; all trials at moderate to high risk of bias |
The reviewers concluded the research isn’t good enough for doctors to make firm recommendations, though magnesium is cheap and widely available. All three trials were in older adults, so they say little about anyone younger.
How much magnesium you need, and how much is too much
| Adults | Daily need (all sources) |
|---|---|
| Men, 19 to 30 | 400 mg |
| Men, 31 and older | 420 mg |
| Women, 19 to 30 | 310 mg |
| Women, 31 and older | 320 mg |
The upper limit for adults is 350 mg a day from supplements and medications. It doesn’t count magnesium from food. High doses from supplements or medications often cause diarrhea, sometimes with nausea and abdominal cramping.
Knowing how much you already get from food is a useful first step before adding a supplement.
What it’s taken with matters
Magnesium works with vitamin D and potassium, and very high zinc supplement doses (142 mg a day in one study) can get in its way. If it’s part of a stack, those pairings are worth a look.
More: Can You Take Magnesium and Zinc Together?
More: Do Vitamin D and Magnesium Work Together?
More: Do Magnesium and Potassium Work Together?
Test it on yourself
- Log your meals for a week first, to see how your magnesium from food compares with the RDA.
- If you decide to try a supplement, log its dose and time.
- Rate your sleep each morning, and compare two weeks with it against the weeks before.
Aurelo Health adds up magnesium from food and supplements in one total, and reads the nights before and after so you can see whether it’s doing anything for you.
Log meals and supplements, rate your nights, and Aurelo shows whether magnesium is doing anything for you.
Get started freeRelated questions
- Can You Take Magnesium and Zinc Together?One study found very high zinc supplement doses, 142 mg a day, can interfere with magnesium absorption and magnesium balance.
- Do Vitamin D and Magnesium Work Together?Yes. Low blood magnesium causes resistance to some of vitamin D’s effects, so keep magnesium intake adequate.
- Does Alcohol Deplete Magnesium?Magnesium deficiency is common in people with chronic alcoholism.
Sources
- Oral magnesium supplementation for insomnia in older adults: a systematic review and meta-analysis, BMC Complementary Medicine and Therapies, 2021
- NIH Office of Dietary Supplements, Magnesium fact sheet for health professionals
General information from the cited sources, not medical advice. If you have kidney problems or take medication, ask a doctor or pharmacist before taking magnesium.