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Systematic review

Review of 12 trials found mixed results for magnesium and sleep, with weak evidence

Lopresti and colleagues · Journal of dietary supplements · 2026

Original title: Magnesium Supplementation for Sleep in Adults: A Systematic Review of Randomized Controlled Trials.

Under review. A person has not yet checked this summary against the paper. It is written from the PubMed abstract. Until a person checks it, search engines are asked not to list this page.

What the study found

Mixed

Findings were inconsistent across sleep diaries, brain recordings, wrist trackers and body markers. Magnesium may give modest benefit on some self-reported measures; evidence was low to very low certainty and does not support routine use for insomnia.

The study at a glance

Type of study
Systematic review
Who or what was studied
12 studies · adults in 12 trials on sleep, insomnia or poor sleep (3 more on cramps or restless legs)
What was tested
Magnesium by mouth alone vs comparison groups, with many doses and lengths
What it measured
The question itself: sleep quality and insomnia
Who has a stake
No disclosure in PubMed
No disclosure in PubMed.
Journal
Journal of dietary supplements, 2026
Source
PubMed record 42661485. This page is based on the abstract only.

How much this study counts

  • •Sums up 12 studies found with a set search method, without pooling the numbers.
  • ✓Measured the question itself: sleep quality and insomnia.
  • •The PubMed record has no conflict-of-interest statement.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

This paper is not on the ladder. It is a systematic review, and reviews and opinion pieces discuss studies that are already counted on the steps below.

↑ Stronger evidence

  1. Trials in people: sleep quality and insomnia

    1

    1 benefit

  2. Trials in people: other measures

    6

    4 benefit, 2 no difference

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    3

    2 mixed, 1 no difference

  5. Blood levels and genes

    3

    2 benefit, 1 no difference

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “Does magnesium help you sleep?”

Not clearly; trials disagree.

Confidence: very low. Based on 16 on-topic papers.

Read the full answer
  • Quoted in “What we found”: A 2026 review of twelve trials of magnesium alone found inconsistent sleep results and low to very low certainty, and did not back it as routine insomnia treatment.
  • Summed up in “What reviews found”: Reviewed twelve trials of magnesium alone for sleep in adults, plus three on cramps or restless legs. Results were inconsistent and certainty low to very low; it does not support magnesium as routine insomnia treatment.
  • Marked as a key paper in the research timeline: Biggest review: twelve trials, inconsistent results.
  • Open item for a person: Mah 2021 and Lopresti 2026 likely pool some of the same trials, possibly Nielsen 2010; check overlap before counting them as separate evidence.

Other reviews on this question

See all 16 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The reviewer corrected 1 field after reading the abstract. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
Source check by a person
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