Magnesium for sleep: what the evidence really supports
the evidence, graded
- Claim
- Magnesium helps you fall asleep and sleep deeper.
- What the evidence says
- Moderate, and shakier than the internet suggests. The decent trials are small and mostly in older adults who were low to begin with.
- Bottom line
- If you're genuinely low, topping up may help. As a sleep cure for everyone else, the evidence is thin — glycinate at night is low-risk to try, just manage expectations.
Magnesium is everywhere in sleep advice right now. The honest version is more “maybe, for some people” than “miracle”.
What the trials actually show
The better studies tend to be small, and run in older adults who were already low in magnesium — exactly the group you’d expect to benefit.1 In those people, topping up can nudge sleep in the right direction.2 Extrapolating that to every healthy adult on the internet is where it falls apart.
Bottom line
Low-risk to try, especially if your diet is light on greens, nuts, and wholegrains. Just don’t expect it to fix a sleep problem that’s really about screens, caffeine, or stress.
references
No industry funding · sources linked above · flagged where the evidence is weak.
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