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Population study: followed a group

Study that followed 3,887 Swiss adults: no clear link between magnesium supplements and sleep

Stadie and colleagues · European journal of nutrition · 2026

Original title: Magnesium supplements, sleep quality, and nocturnal leg cramps: a combination of cross-sectional and prospective studies.

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

No difference

No consistent link between magnesium supplements and sleep scores or sleep lab results. Users had more night cramps or restless legs, with a trend toward poorer sleep. Magnesium did not prevent night cramps.

The study at a glance

Type of study
Population study: followed a group
Who or what was studied
3,887 people · adults from a Swiss community group, about 57 years old, 4.5% taking magnesium
What was tested
Compared people who take magnesium supplements with non-users on sleep questionnaires, sleep lab tests and night cramps, over three check-ups
What it measured
The question itself: sleep quality and insomnia
Who has a stake
Company stake
The cohort lists GlaxoSmithKline among its funders; authors report no competing interest.
Journal
European journal of nutrition, 2026
Source
PubMed record 41697399. This page is based on the abstract only.

How much this study counts

  • –Shows a link, not a cause: people chose their own habits, and other differences between them may explain the result.
  • ✓Followed people over time, so habits were recorded before the outcome happened.
  • •3,887 people.
  • ✓Measured the question itself: sleep quality and insomnia.
  • –Company stake: The cohort lists GlaxoSmithKline among its funders; authors report no competing interest.
  • •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

Each dot is one on-topic paper on this question. Steps near the top answer the question more directly.

↑ 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

    ↑ This study is the ringed dot

  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

Of the other 2 papers on the same step: 2 mixed. This one found no difference. It differs from most of them.

  • Quoted in “What we found”: A Swiss study of 3887 adults found no consistent link between taking magnesium supplements and sleep, measured by questionnaires or overnight sleep tests.
  • Part of the finding “Population studies show links, not causes”.
  • Marked as a key paper in the research timeline: Large cohort: no consistent link to sleep.

Other papers on the same step

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 two reads differed. The reviewer checked the abstract and kept the first read. 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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