Magnesium vs Melatonin for sleep: which has better evidence?
A tie on evidence grade for sleep (Magnesium Grade B vs Melatonin Grade B). For sleep, the two are evidence-matched; the difference is in effect and safety.
Head to head
| Magnesium | Melatonin | |
|---|---|---|
| Grade | grade B | grade B |
| Certainty | moderate | moderate |
| Effect | modest improvement in sleep | reduces time to fall asleep; best for circadian timing |
| Studied dose | 200–400 mg | 0.5–3 mg |
| Population | adults | — |
| Safety | 1 modeled interaction(s) | 1 modeled interaction(s) |
Grade B / moderate: probably helps, and new studies are unlikely to reverse this — but could shrink the effect size.
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.
Decision guidance
- If certainty matters most — choose whichever side carries the higher certainty rating at a similar grade.
- If you're on medications — check each side's interaction pages before deciding; safety differences dominate small evidence-grade gaps.
- If your population is under-studied — the smaller-effect side with better population evidence often wins over the higher-grade side studied in a different demographic.
- If cost matters — form and dose page differences (Magnesium vs Melatonin) can invert the practical winner.
Grade history
No grade changes yet. Initial grade assigned; re-reviewed on every 12 months (Grade A/B) — next review by . Methodology v1.
Re-review cadence: every 12 months (Grade A/B) · next scheduled by · methodology v1.
Frequently asked
Which has stronger evidence: Magnesium or Melatonin for sleep?
Magnesium carries Grade B at moderate certainty; Melatonin carries Grade B at moderate. The stronger evidence points to a tie, 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
Reuse under CC-BY 4.0 with attribution to evidencebased.info.
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}
}