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Magnesium
Magnesium is the fourth most abundant mineral in the body and a cofactor in over 300 enzymatic reactions. It is involved in energy production, muscle and nerve function, blood sugar regulation, and bone health. Subclinical magnesium deficiency is thought to be widespread in modern diets, particularly due to soil depletion and processed food consumption. Different forms of magnesium have different bioavailability and clinical applications.
Key Benefits
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Muscle & Nerve Function
Magnesium regulates muscle contraction by acting as a natural calcium channel blocker. It helps prevent cramps and supports proper nerve signal transmission.
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Sleep Quality
Magnesium activates the parasympathetic nervous system and regulates GABA receptors, which may improve sleep onset and overall sleep quality.
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Energy & ATP Production
ATP (the body's energy currency) must be bound to magnesium to be biologically active. Every energy-dependent process in the body requires magnesium.
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Bone Health
About 60% of the body's magnesium is stored in bones. It influences both bone mineral density and the activity of osteoblasts and osteoclasts.
How It Works
Magnesium acts as a cofactor in over 300 enzymatic reactions, including those involved in ATP synthesis, DNA and RNA synthesis, protein synthesis, and neuromuscular function. It regulates calcium entry into cells by serving as a natural calcium channel blocker, which is central to its role in muscle relaxation and nerve function. It also modulates NMDA receptors and GABA receptors in the brain, contributing to its calming and sleep-promoting effects.
Scientific Research
The effect of magnesium supplementation on subjective anxiety and stress
Nutrients • 2017
Systematic review of 18 studies found that magnesium supplementation had a positive effect on subjective anxiety in anxiety-vulnerable populations, though methodological quality was mixed.
Read StudyThe effect of magnesium supplementation on primary insomnia in elderly
Journal of Research in Medical Sciences • 2012
Supplementation with 500mg magnesium daily for 8 weeks significantly improved sleep time, sleep efficiency, and melatonin levels in elderly subjects with insomnia.
Read StudyFrequently Asked Questions
Which form of magnesium is best?
It depends on your goal. Glycinate is well-tolerated and often preferred for sleep and relaxation. Citrate works well for general supplementation and has a mild laxative effect. Threonate is marketed for brain health due to research on BBB permeability. Oxide is cheap but poorly absorbed. There is no single "best" form.
Can I take magnesium every day?
Yes. Daily supplementation is standard practice and is how most studies were conducted. The body excretes excess magnesium through the kidneys (assuming normal kidney function), so moderate daily supplementation within recommended ranges is generally safe long-term.
How do I know if I am magnesium deficient?
Standard serum magnesium tests are not very reliable because only about 1% of magnesium is in the blood. Red blood cell (RBC) magnesium is a better marker. Common symptoms of deficiency include muscle cramps, poor sleep, irritability, and fatigue, but these are nonspecific. Given widespread subclinical deficiency estimates, many practitioners consider a trial of supplementation reasonable.
Safety Information
Possible Side Effects
- Diarrhea or loose stools (dose-dependent)
- Stomach cramps
- Nausea at high doses
Drug Interactions
- Antibiotics (quinolones, tetracyclines)
- Bisphosphonates
- Diuretics
- Proton pump inhibitors
Contraindications
- Severe kidney disease (impaired magnesium excretion)
- Myasthenia gravis
- Heart block
Dosage Information
Recommended Daily Dose
310-420mg per day (varies by age and sex)
Range
200-600mg from supplements (in addition to dietary intake)
Timing
Evening dosing is common for sleep benefits. Divided doses improve absorption. Take with food to reduce GI discomfort.
Form matters: magnesium glycinate is well-tolerated and calming, magnesium citrate has a mild laxative effect, magnesium threonate may cross the blood-brain barrier, magnesium oxide has poor bioavailability. Choose form based on your primary goal.
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