Review of studies · Supplements / medicine · 14 Oct 2026
A review of 12 placebo-controlled trials found the evidence that magnesium helps sleep is inconsistent and low certainty
Source: Journal of Dietary Supplements
What the research found
Study (systematic review). Adrian Lopresti and colleagues reviewed 12 placebo-controlled trials of magnesium for sleep in adults. Certainty was low or very low for the sleep outcomes. Forms included L-threonate, oxide, chloride, gluconate, citrate, bisglycinate, and one food-grown product, and no trial compared forms head to head. Some trials in older adults with insomnia and in people with self-reported poor sleep looked favorable. Trials in polycystic ovary syndrome, fibromyalgia, and cognitive impairment did not show a clear magnesium-specific sleep benefit. Most trials had a medium-to-high risk of bias, and some people reported mild stomach upset. The authors say this does not prove magnesium never helps, and it also does not support selling it as an established insomnia treatment. Not medical advice.
Evidence level: Review of studies. This is among the stronger kinds of evidence, but one study rarely settles a question.
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