Maybe a little, in some people, on thin evidence: a handful of small trials, mostly in older adults with low magnesium - no large decisive study, and the NIH does not list sleep as an established use.
It is low-risk for healthy adults at supplement doses under 350 mg daily (the NIH upper limit; past that, diarrhea), but people with kidney disease should skip it. Food sources - nuts, seeds, beans, greens - carry no limit concern. What it is not: a substitute for the proven fixes - schedule, light, and CBT-I for the chronic form.
What to do
Common questions
Does magnesium help you sleep?
The honest answer is "maybe a little, in some people, on thin evidence." The biology is plausible - magnesium participates in nervous-system calming - but the trial record is a handful of small studies, mostly in older adults and people with low magnesium, showing modest improvements; there is no large, decisive trial, and the NIH Office of Dietary Supplements does not list sleep as an established use. The practical frame: if you want to try it, it is low-risk for healthy adults at normal supplement doses - the NIH sets 350 mg per day as the upper limit for supplemental magnesium, above which diarrhea is the common result, and people with kidney disease should skip it entirely since they clear magnesium poorly. Food sources - nuts, seeds, beans, greens, whole grains - carry no upper-limit concern. What magnesium is not: a substitute for the fixes with real evidence - schedule consistency, light management, and CBT for insomnia for the chronic form. If a powder in the evening helps you, the ritual itself may be doing some of the work, and that is fine. Pymander, a free AI doctor available 24/7 by text, can help you weigh it against the proven options.