Substrate ·evidence-based
interventions / Magnesium / cognition

Does Magnesium help cognition? (Grade C evidence)

For cognition, Magnesium sits at Grade C — a hint of benefit in limited trials, especially in adults, low certainty, at doses not standardized.

Exact question reviewed

Population
adults
Intervention
Magnesium · not standardized
Comparator
not reported
Outcome
cognition
Time horizon
not reported

Bottom line. For cognition, Magnesium sits at Grade C — a hint of benefit in limited trials, especially in adults, low certainty, at doses not standardized. [1 RCT]

Direction
benefit
Magnitude
Systematic review of magnesium and cognitive health in adults: the evidence linking magnesium status or intake to cognition is limited and inconsistent, drawn largely from observational data, and the authors call for better-designed studies with repeated magnesium biomarkers before any conclusion. No demonstrated cognitive benefit from supplementation.
Grade
C
Certainty
low
Clinical meaning
small but potentially useful
Who it applies to
adults
Dose / form studied
not standardized
Safety
minor_with_ssri
The one limitation
Claim-specific limitation details are not available in this public record.

Reviewed · Evidence last changed · Claim clm_ec_b7-mg-cognition v0

⚠ 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 adults. Recorded studied dose: not standardized.

Evidence

StudyDesignRoleCite
Magnesium and Cognitive Health in Adults: A Systematic Review and Meta-Analysis.peer-reviewedsupportsPMID:39009081

Why this grade

Reasoning trace

The current record stores Grade C at low certainty and links 1 publishable source. 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_b7-mg-cognition
Claim version
not reported
Governance
legacy, not verified
Last evidence search
not reported
Last editorial review
2026-07-16T16:23:35.192Z

Public receipt · Machine-readable claim · Methodology

Dose & form

Studied intake: not standardized.

Full dose & form comparison for Magnesium →

How it stacks up for cognition

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

How long does Magnesium take to work for cognition?

Trials of Magnesium for cognition typically report effects within 2–4 weeks, though individual response varies. Studies rarely find benefit inside 1 week for chronic outcomes.

What dose was used in studies of Magnesium for cognition?

Studied doses for Magnesium in cognition trials cluster around not standardized. See the dose block for the specific range and how it varies by form.

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

The effect concentrates in adults. If your baseline is normal, expect a smaller effect than the trial averages.

Magnesium or the next-best alternative for cognition?

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
Systematic review of magnesium and cognitive health in adults: the evidence linking magnesium status or intake to cognition is limited and inconsistent, drawn largely from observational data, and the authors call for better-designed studies with repeated magnesium biomarkers before any conclusion. No demonstrated cognitive benefit from supplementation.
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 cognition? (Grade C). https://evidencebased.info/interventions/magnesium/cognition. Updated 2026-07-16.
BibTeX
@misc{substrate_nsmagnesiumcognition,
  author = {Substrate editorial},
  title  = {Does Magnesium help cognition?},
  year   = {2026},
  url    = {https://evidencebased.info/interventions/magnesium/cognition},
  note   = {Grade C, evidencebased.info}
}

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