Digestery
Everyday supplements › Magnesium and Sleep › Studies

Gene study (Mendelian randomization)

Gene study of 15 blood nutrients: no clear link to sleep length or insomnia

Zhang and colleagues · Brain and behavior · 2025

Original title: Genetically Supported Causality Between Micronutrients and Sleep Behaviors: A Two-Sample Mendelian Randomization Study.

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 causal link was found between micronutrient levels and sleep duration or insomnia. Only folate, vitamin B6 and vitamin D related to chronotype (morning or evening type). Magnesium is not named in the results.

The study at a glance

Type of study
Gene study (Mendelian randomization)
Who or what was studied
large genetic databases on 15 blood micronutrients and sleep habits
What was tested
Whether genes that change blood levels of magnesium and 14 other nutrients change sleep length, insomnia or body clock type
What it measured
The question itself: sleep quality and insomnia
Who has a stake
No stake declared
No competing interests declared.
Journal
Brain and behavior, 2025
Source
PubMed record 39910798. This page is based on the abstract only.

How much this study counts

  • •A gene study: it uses natural gene differences as a kind of experiment. It is less affected by lifestyle than surveys, but it rests on assumptions that can fail.
  • •The abstract does not say how many people took part.
  • ✓Measured the question itself: sleep quality and insomnia.
  • ✓No competing interests declared.
  • •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

  5. Blood levels and genes

    3

    2 benefit, 1 no difference

    ↑ This study is the ringed dot

↓ 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 benefit. This one found no difference. It differs from most of them.

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 agreed on every checked field. 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
Not yet. Required before search engines may list this page.

Spot an error? Email a flag with a link to your source, or use the form on the question page.