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compare / Magnesium vs Melatonin

Magnesium vs Melatonin for sleep: which has better evidence?

Melatonin has the stronger evidence for sleep (Magnesium Grade C vs Melatonin Grade B). For sleep, Melatonin has the stronger evidence grade.

Reviewed by Substrate editorial, Independent research collective ·

Platform evidence comparison

These existing platform assessments are separate from the source-reported findings below. They do not represent a direct trial comparing these treatments.

MagnesiumMelatonin
Gradegrade Cgrade B
Certaintylowmoderate
Effectmay 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 uncertainreduces time to fall asleep; best for circadian timing
Studied dosevaried; one 8-week trial used 500 mg elemental magnesium daily0.5–3 mg
Populationprimarily older adults with insomnia—
Safety1 modeled interaction(s)1 modeled interaction(s)
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.

Direct comparison evidence

There are no direct RCTs in our corpus comparing Magnesium and Melatonin head-to-head for sleep. What we present above is an indirect comparison: each side's own trials, contrasted. This is standard practice for supplement comparisons — dose, population, and outcome-instrument differences between the two evidence bases add uncertainty on top of each side's own grade.

Can you take both?

No modeled interaction between Magnesium and Melatonin in our corpus. Absence of a recorded interaction is not proof of additive benefit — combined-effect trials are usually absent for supplement pairs, so treat "stack" claims skeptically.

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. 2 candidate papers were omitted because publication authority was unavailable. 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 the full paper explanation →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 the full paper explanation →Original source · Bring into My Profile

Studied contexts, side by side

These studies measured their own outcomes in their own populations. Differences between columns are differences in what was studied — not a ranking, and not a head-to-head result.

One column per source-reported finding. Values are as reported; nothing is combined across columns.
Studied contextPMID 39252819: Oura ringPMID 39138397: ISI
Participants / populationEighty 35-55-year-olds with self-assessed sleep problemspatients undergoing lumbar fixation
Study designrandomized, double-blind, placebo-controlled, parallel-arm studyrandomized controlled trial
Studied intervention1 g/day of MgTMagnesium sulphate
Studied combinationMgTNot encoded in this record
Studied route / contextNot encoded in this recordintravenous
Comparatorplacebogeneral anesthesia
Measured outcomedeep 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)insomnia severity (ISI)
Timepoint21 days MgT or placebo2 weeks after surgery
Source-reported resultDirection 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.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.

Decision guidance

sources: PMID:35184264 · PMID:33865376 · PMID:23691095 · PMID:15649737

Grade history

No grade changes yet. Initial grade assigned; re-reviewed on every 6 months (Grade C+) — next review by . Methodology v1.

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

Frequently asked

Which has stronger evidence: Magnesium or Melatonin for sleep?

Magnesium carries Grade C at low certainty; Melatonin carries Grade B at moderate. The stronger evidence points to Melatonin, subject to the caveat that direct head-to-head trials are usually absent for supplement pairings.

Can I take Magnesium and Melatonin together?

No modeled interaction between Magnesium and Melatonin; combining is not documented to be problematic, but combined-effect trials are also absent, so treat additive benefit claims skeptically.

Have Magnesium and Melatonin been compared head-to-head?

Direct RCTs comparing the two for sleep are uncommon. This page contrasts each side's own trial evidence — that is an indirect comparison, which introduces confounds from population and dose differences. See the direct-comparison block above.

What decides between Magnesium and Melatonin for me?

Read the decision guidance below — the split usually comes down to population fit, interaction risk with your other medications, and how much certainty you want behind the recommendation.

Related

Cite this page

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

Plain-text citation
Substrate. Magnesium vs Melatonin for sleep. https://evidencebased.info/compare/magnesium-vs-melatonin-for-sleep. Updated 2026-07-14.
BibTeX
@misc{substrate_mvsmelatoninforsleep,
  author = {Substrate editorial},
  title  = {Magnesium vs Melatonin for sleep},
  year   = {2026},
  url    = {https://evidencebased.info/compare/magnesium-vs-melatonin-for-sleep},
  note   = {evidencebased.info}
}