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interventions / Magnesium / sleep

Does Magnesium help sleep? (Grade C evidence)

Explore current source-reported research for this exact question. These records are separate from the synthesis below; they do not update its grade or establish a recommendation.

Magnesium shows a Grade C benefit for sleep: the recorded evidence, especially in primarily older adults with insomnia suggests a modest effect, low certainty. Dose range varied; one 8-week trial used 500 mg elemental magnesium daily.

Exact question reviewed

Population
primarily older adults with insomnia
Intervention
Magnesium · varied; one 8-week trial used 500 mg elemental magnesium daily
Comparator
not reported
Outcome
sleep
Time horizon
not reported

Bottom line. Magnesium shows a Grade C benefit for sleep: the recorded evidence, especially in primarily older adults with insomnia suggests a modest effect, low certainty. Dose range varied; one 8-week trial used 500 mg elemental magnesium daily. [2 other]

Direction
benefit
Magnitude
may modestly reduce sleep-onset latency in older adults with insomnia, but the evidence is limited and low quality; benefit for general adults or magnesium glycinate specifically is uncertain
Grade
C
Certainty
low
Clinical meaning
small but potentially useful
Who it applies to
primarily older adults with insomnia
Dose / form studied
varied; one 8-week trial used 500 mg elemental magnesium daily
Safety
minor_with_ssri
The one limitation
Claim-specific limitation details are not available in this public record.

Reviewed not reported · Evidence last changed · Open evidence record (version 0)

⚠ Safety in context

Grade
C
what does the grade mean?
Certainty
low
what does certainty mean?

Grade C / low: hints of benefit in small trials; a well-run RCT could easily push this to B or to null.

Who it works for

Best-studied in primarily older adults with insomnia. Recorded studied dose: varied; one 8-week trial used 500 mg elemental magnesium daily.

Evidence

StudyDesignRoleCite
The Role of Magnesium in Sleep Health: a Systematic Review of Available Literaturepeer-reviewednot classifiedPMID:35184264 · DOI
Oral magnesium supplementation for insomnia in older adults: a Systematic Review & Meta-Analysispeer-reviewednot classifiedPMID:33865376 · DOI

Why this grade

Reasoning trace

The current record stores Grade C at low certainty and links 2 publishable sources. A claim-specific domain-by-domain grading rationale is not available in this public record, so no reason for upgrading or downgrading is inferred here.

Audit and version

Claim ID
ec_mg_sleep
Claim version
not reported
Governance
legacy, not verified
Clinician review
Not yet reviewed by a licensed clinician
Last evidence search
not reported
Last editorial review
not verified

Public receipt · Machine-readable claim · Methodology

Dose & form

Studied intake: varied; one 8-week trial used 500 mg elemental magnesium daily.

Full dose & form comparison for Magnesium →

People say · Evidence shows

“Magnesium glycinate is better for sleep because it crosses the blood-brain barrier”

Evidence: Grade C — may modestly reduce sleep-onset latency in older adults with insomnia, but the evidence is limited and low quality; benefit for general adults or magnesium glycinate specifically is uncertain.

How it stacks up for sleep

Grade history

Re-review cadence: every 6 months (Grade C+) · methodology v1.

Frequently asked

How long does Magnesium take to work for sleep?

This record does not report a studied onset time for Magnesium and sleep. Do not assume a typical timeframe.

What dose was used in studies of Magnesium for sleep?

The recorded studied dose for Magnesium and sleep is varied; one 8-week trial used 500 mg elemental magnesium daily. This is a source detail, not a dose recommendation.

Does Magnesium work for sleep if I'm not deficient?

The recorded studied population is primarily older adults with insomnia. This field alone does not show whether deficiency or baseline status changes the effect.

Magnesium or the next-best alternative for sleep?

See the compare block above for the head-to-head with the most-cited alternative. Grade + certainty differences matter more than any single trial.

Related

What this is — and is not

Evidence description
may modestly reduce sleep-onset latency in older adults with insomnia, but the evidence is limited and low quality; benefit for general adults or magnesium glycinate specifically is uncertain
Substrate's interpretation
The current reviewed record assigns Grade C at low certainty. A domain-by-domain rationale is shown only when recorded.
Discuss with a clinician
If you're on medication or have a condition that changes the calculus, bring the interaction & population blocks above to your pharmacist or prescriber before deciding.
Individualized medical advice
Not provided here or on any Substrate surface (API, agent tool, embed) — see YMYL policy.

Cite this page

Citation is encouraged. The proposed reuse license is CC-BY-4.0; status: pending-governance-ratification.

Plain-text citation
Substrate. Does Magnesium help sleep? (Grade C). https://evidencebased.info/interventions/magnesium/sleep. Updated 2026-07-19.
BibTeX
@misc{substrate_ntionsmagnesiumsleep,
  author = {Substrate editorial},
  title  = {Does Magnesium help sleep?},
  year   = {2026},
  url    = {https://evidencebased.info/interventions/magnesium/sleep},
  note   = {Grade C, evidencebased.info}
}

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Current source-reported research

Membership uses admitted intervention and measured-outcome associations for this exact question. Different populations, preparations, comparators and timepoints remain separate. No pooling or update to the synthesis is asserted.

This filtered view rechecked source-context candidates for current publication and source integrity. Other papers were not evaluated; an empty result does not establish that research is absent. Browse the broader bounded research library.

Source-reported research findings

AI-extracted — pending human review. These findings retain the studied context and are not pooled treatment estimates.

Single study

PMID 39252819: Oura ring

  • AI-extracted — pending human review
  • Extraction status: machine extracted. Source status is not human clinical review.
  • Publication status: published. Record review status: not reviewed.
  • Not poolable: one source-reported result, not a pooled treatment estimate.

Direction for deep sleep score, REM sleep score, light sleep time, and activity and readiness parameters activity score, activity daily movement score, readiness score, readiness activity balance, and readiness sleep balance (Oura ring) remains unresolved in this record.

Reported p < 0.05.

  • Studied combination: MgT.

Eighty 35-55-year-olds with self-assessed sleep problems; randomized, double-blind, placebo-controlled, parallel-arm study. 1 g/day of MgT versus placebo. deep sleep score, REM sleep score, light sleep time, and activity and readiness parameters activity score, activity daily movement score, readiness score, readiness activity balance, and readiness sleep balance (Oura ring) at 21 days MgT or placebo.

Related research with a different studied context; applicability to this question remains limited.

That’s the gist — a fine place to stop. This describes the studied groups, not personal suitability.

Read this finding in study context →Original source · Bring into My Profile

Single study

PMID 38745424: PSQI

  • AI-extracted — pending human review
  • Extraction status: machine extracted. Source status is not human clinical review.
  • Publication status: published. Record review status: not reviewed.
  • Not poolable: one source-reported result, not a pooled treatment estimate.

Authors reported a direction only for sleep quality (PSQI): favours the studied intervention.

Reported p < 0.05.

  • Studied combination: 1.9 mg melatonin + 200 mg elemental magnesium.
  • Studied route/context: unclear.

otherwise healthy individuals with sleep disturbances; double-blinded, randomized, crossover trial. supplement condition versus placebo. sleep quality (PSQI) at 4 week intervention.

Related research with a different studied context; applicability to this question remains limited.

That’s the gist — a fine place to stop. This describes the studied groups, not personal suitability.

Read this finding in study context →Original source · Bring into My Profile

Single study

PMID 39138397: ISI

  • AI-extracted — pending human review
  • Extraction status: machine extracted. Source status is not human clinical review.
  • Publication status: published. Record review status: not reviewed.
  • Not poolable: one source-reported result, not a pooled treatment estimate.

Authors reported insomnia severity (ISI) as Mg sulphate group 17.45 score and Control group 22.4 score, each summarised separately.

Reported p < 0.001.

  • Studied route/context: intravenous.

patients undergoing lumbar fixation; randomized controlled trial. Magnesium sulphate versus general anesthesia. insomnia severity (ISI) at 2 weeks after surgery.

Related research with a different studied context; applicability to this question remains limited.

That’s the gist — a fine place to stop. This describes the studied groups, not personal suitability.

Read this finding in study context →Original source · Bring into My Profile