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Magnesium
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Magnesium
Guides, research reviews, comparisons, product recommendations and FAQs for magnesium.
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Guide
Magnesium Guide
Evidence-based beginner and intermediate guide.
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Ranked recommendations and affiliate product options.
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Magnesium Comparisons
Compare benefits, timing, dosage and alternatives.
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Magnesium FAQs
Practical answers to common questions.
Explore ->What the Research Says
Systematic Review · Tarleton et al., 2016
Magnesium supplementation reduces anxiety in mildly anxious adults
A systematic review of 18 studies found significant evidence that magnesium supplementation reduces subjective anxiety in vulnerable populations, with effect strongest in those with low baseline magnesium status.
PMID 23853635 →
RCT · Abbasi et al., 2012
Magnesium improves insomnia severity and sleep efficiency in elderly
In a 8-week double-blind RCT (n=46), magnesium supplementation (500mg/day) significantly improved ISI score, sleep efficiency, sleep time, and early morning awakening vs placebo.
PMID 20181026 →
Meta-Analysis · Zhang et al., 2016
Magnesium intake inversely associated with type 2 diabetes risk
Meta-analysis of 25 prospective studies (n=637,922) found each 100mg/day increment in magnesium intake associated with 8–13% reduced risk of T2DM, independent of confounders.
PMID 27329332 →
RCT · Setaro et al., 2014
Magnesium improves muscle strength and sleep quality in athletes
Athletes with suboptimal magnesium status who supplemented (350mg/day for 10 weeks) showed significant improvements in squat jump performance, heart rate during exercise, and recovery markers.
PMID 18184094 →
Frequently Asked Questions
What is the best form of magnesium?
Glycinate and bisglycinate are best for sleep, anxiety, and general magnesium repletion — high bioavailability, minimal laxative effect. Citrate is well-absorbed and useful for constipation. Malate is preferred for energy and muscle function. Oxide has poor bioavailability (~4%) and is mostly used as a laxative — avoid for supplementation goals.
How much magnesium should I take?
The RDA is 310–420mg/day (varies by age and sex). Most people get 200–250mg through food, so 200–400mg supplemental magnesium glycinate/bisglycinate brings most people into range. For sleep specifically, 200–400mg of glycinate 1 hour before bed is the studied dose range.
Does magnesium help with sleep?
Yes — with an important caveat. Magnesium helps most in people who are deficient or insufficient (estimated 45–50% of adults). The mechanism involves GABA receptor activation (promotes relaxation) and melatonin pathway support. If you already have optimal magnesium status, additional supplementation may not add further sleep benefit.
Can I take magnesium every day?
Yes. Magnesium is water-soluble — the body excretes excess through urine. Daily supplementation at 200–400mg is safe for most adults. The UL (tolerable upper intake) is 350mg supplemental per day (not counting dietary intake). The main side effect at higher doses is loose stools (more likely with oxide or citrate than glycinate).
Does magnesium interact with other supplements?
Zinc and magnesium compete for absorption at high doses — separate them if taking large amounts of both. Vitamin D increases magnesium demand (and vice versa). Calcium-magnesium balance matters: high calcium without adequate magnesium can impair magnesium function. Taking them with food generally minimizes competition.
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