The Best Magnesium Supplements for Sleep
Updated By the HealthWorld editorial teamHow we pick
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Top picks at a glance
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For sleep, most people choose magnesium glycinate, a form bound to the amino acid glycine that's gentle on the stomach. Magnesium supports muscle relaxation and nervous system function, which is why it's a popular part of a wind-down routine, but it isn't a sedative. Doctor's Best is our top tablet pick; Thorne's bisglycinate powder suits people who prefer an evening drink.
Our picks
#1Best overall
Doctor's Best High Absorption Magnesium
100% chelated magnesium (glycinate lysinate) in tablet form. Gentle on the stomach and one of the most popular glycinate options available.
#2Best powder
Thorne Magnesium Bisglycinate
Magnesium bisglycinate powder you stir into water, which makes an easy evening ritual. From one of the most trusted practitioner brands.
What to look for
- The form of magnesium
- Glycinate (or bisglycinate) is the usual evening choice because it's less likely to loosen stools. Citrate is well absorbed but more laxative; oxide is inexpensive but less well absorbed.
- Elemental magnesium
- Check the label for elemental magnesium, not just the weight of the compound. For adults, the upper limit for magnesium from supplements is 350 mg a day unless your doctor advises otherwise.
- Fully chelated vs buffered
- 'Buffered' products mix in magnesium oxide to raise the dose per tablet. 'Fully' or '100% chelated' means all the magnesium is bound to amino acids.
- Kidneys and medications
- People with kidney disease shouldn't take magnesium without medical advice. Magnesium can also interfere with some antibiotics and osteoporosis medicines, so ask your pharmacist about spacing doses.
Frequently asked questions
Does magnesium glycinate help you sleep?
Magnesium supports muscle relaxation and normal nervous system function, and some small studies, mostly in older adults, suggest it may improve sleep quality. Results are mixed, and it tends to help most if your diet is low in magnesium. It works best alongside good sleep habits.
How much magnesium glycinate should you take for sleep?
Many products provide around 100–200 mg of elemental magnesium per serving. The upper limit for supplemental magnesium for adults is 350 mg a day unless your doctor recommends more. Start low and check the label for elemental magnesium.
When should you take magnesium glycinate, morning or night?
For sleep, most people take it in the evening, often 30–60 minutes before bed, as part of a wind-down routine. If you take it for general health, any time of day works. Taking it with food can help if it upsets your stomach.
How long does magnesium glycinate take to work?
Some people feel more relaxed within a few days; for others it takes a few weeks of consistent use, especially if their intake was low. Give it two to four weeks before deciding whether it helps.
Can you take magnesium with melatonin?
Generally yes; they work in different ways and are often taken together. Start with a low melatonin dose, and talk to your doctor if you take sleep, blood pressure or other regular medication.
Sources
- Magnesium — Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
- Melatonin: What You Need To Know — NIH National Center for Complementary and Integrative Health
- Ashwagandha — Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
- Dietary Supplements — U.S. Food & Drug Administration