Does magnesium actually improve sleep? What does the research say about the effect size?
I see magnesium supplements recommended everywhere for better sleep, but I'm curious about the actual evidence behind it. A meta-analysis from 2017 reviewed multiple studies and found that magnesium supplementation had a moderate effect size (d=0.5) on sleep quality, especially in those who were deficient. In practical terms, this means it can help, but it isn't a miracle fix.
The studies usually involved small sample sizes and varied dosages, so the response can differ from person to person. If you're already getting enough magnesium from your diet, popping a supplement may not do much for your sleep. It's worth considering your overall lifestyle too, stress management and good sleep hygiene can often be just as important, if not more so. Has anyone had real success with magnesium for sleep? I'd love to hear about it.