Magnesium is one of the most popular supplements for sleep — and one of the few with at least some supporting research. Here is what the evidence actually shows, and how to think about it.
Why magnesium and sleep get linked
Magnesium plays a role in hundreds of enzymatic reactions, including pathways involved in the nervous system. It interacts with GABA receptors, which help calm neural activity, and many adults simply do not get the recommended daily amount from food.
What the research says
Several small randomized trials in older adults have reported modest improvements in self-reported sleep measures such as how quickly people fall asleep. The studies are small and the effects are not dramatic, so magnesium is best seen as a gentle support rather than a sleeping pill.
Forms and dosage
Magnesium glycinate is popular because it is well absorbed and gentle on the stomach. Magnesium oxide is cheaper but more likely to cause loose stools. Common supplemental doses fall in the 200–400 mg range, taken in the evening.
Safety notes
Magnesium is generally well tolerated, but people with kidney problems should be cautious, and high doses can cause digestive upset. If you take medication or have a health condition, talk to your healthcare provider first.